{"id":17390,"date":"2026-08-11T10:27:43","date_gmt":"2026-08-11T15:27:43","guid":{"rendered":"https:\/\/uwm.edu\/field-station\/?p=17390"},"modified":"2026-09-08T10:49:26","modified_gmt":"2026-09-08T15:49:26","slug":"black-thorn-footed-mason-wasp","status":"publish","type":"post","link":"https:\/\/uwm.edu\/field-station\/bug-of-the-week\/black-thorn-footed-mason-wasp\/","title":{"rendered":"Black Thorn-footed Mason Wasp"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Howdy, BugFans,<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Heads up &#8211; We\u2019re venturing into the weeds taxonomically in this episode, but we\u2019ll take it slow, and the BugLady is confident that BugFans can handle it.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The BugLady was enjoying the prairie flowers at Riveredge one day when she saw this odd little wasp that was also enjoying them (the flower is Rattlesnake master). Turns out it was a Black Thorn-footed Mason Wasp (<em>Zethus spinipes<\/em>).&nbsp;Mason wasps have appeared in these <a href=\"https:\/\/uwm.edu\/field-station\/bug-of-the-week\/bramble-mason-wasp\/\">pages<\/a> before &#8211; let\u2019s review who they are.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">They\u2019re in the family Vespidae, a family of almost 5,000 species (325-ish in North America) that includes social wasps and solitary wasps and lots of different lifestyles.&nbsp;Paper wasps, yellowjackets, and hornets are its better-known members, with the potter and mason wasps (subfamily Eumeninae, which used to be its own family, Eumenidae) sneaking in under the radar.&nbsp;The BugLady was surprised to read that although they are relatively inconspicuous, the Eumeninae make up the vast majority of the Vespids, with 260 species here and 4,500 species worldwide. Ants, bees, and wasps are under a big umbrella, the Order Hymenoptera.&nbsp;<\/p>\n\n\n\n<figure class=\"alignleft uwm-c-img--left\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"215\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2026\/09\/potter-wasp17-4rz-300x215.webp\" alt=\"potter wasp on flower\" class=\"wp-image-17409\" srcset=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2026\/09\/potter-wasp17-4rz-300x215.webp 300w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2026\/09\/potter-wasp17-4rz.webp 400w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><figcaption>Potter Wasp<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The Eumeninae are solitary wasps that feed on nectar but serve up the bodies of other invertebrates \u2013 mainly moth caterpillars &#8211; to their larvae.&nbsp;They have a variety of nest styles &#8211; some are opportunists that use pre-made holes or cavities mostly above ground, like tunnels of other insects, nail-holes, etc. and others build egg chambers from natural materials like mud, sand, or vegetation.&nbsp;The name Potter wasp comes from the (very cool) urn-shaped mud <a href=\"https:\/\/www.bugguide.net\/node\/view\/439141\/bgimage\">nests<\/a> constructed by some species.&nbsp;When they\u2019re finished, the egg cells are stocked with paralyzed bodies, an egg is laid (some species suspend the egg from the ceiling with a strand of dried fluid), the chamber is closed, and a new one is started beside it.&nbsp;When the eggs hatch, dinner is served.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Eumeninae is the biggest subfamily in the Vespidae, and&nbsp;<em>Zethus<\/em>&nbsp;is the largest genus in the Eumeninae, with about 250 species worldwide (and, of course, its taxonomy is under review).&nbsp;They are mostly neotropical (Brazil is a hotbed of&nbsp;<em>Zethus<\/em>&nbsp;species), with only six species in North America north of the Rio Grande. Of those six, five are restricted to the far southern portion of this country, and one is widespread in the eastern US (in short, the BugLady is sure of her ID on this one!).&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Zethus<\/em>, weighing in at \u00bd\u201d to 5\/8\u201d, may use bits of vegetation or wood to make nests in twigs and branches, in used insect tunnels, or underground, but they don\u2019t make mud nests.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">We think of wasps as being, well, \u201cwasp-waisted,\u201d and some take it to extremes, especially in a different wasp family, Sphecidae, the <a href=\"https:\/\/www.bugguide.net\/node\/view\/2489169\/bgimage\">Thread-waisted<\/a> wasps.&nbsp;The constricted bit &#8211; the stalk that connects the thorax with the rear of the abdomen &#8211; consists of the narrowed first (and sometimes second) abdominal segment.&nbsp;This stalk is called the \u201c<em>petiole<\/em>\u201d (the abdomen is \u201c<em>petiolate,<\/em>\u201d the opposite of which is \u201c<em>sessile<\/em>\u201d).&nbsp;Meanwhile, back in the Eumeninae,&nbsp;<em>Zethus<\/em>&nbsp;and another genus,&nbsp;<em>Eumenes<\/em>, have conspicuous <a href=\"https:\/\/www.bugguide.net\/node\/view\/2556597\/bgpage\">petioles<\/a>, but at the back of the petiole is swollen area that ends in a second, wider petiole.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At last \u2013 the BLACK THORN-FOOTED MASON WASP! There are two subspecies, one southern (<em>Zethus spinipes <a href=\"https:\/\/www.bugguide.net\/node\/view\/2397609\/bgimage\">variegatus<\/a>&nbsp;<\/em>) and one northern&nbsp;(<em>Zethus spinipes spinipes<\/em>). The northern subspecies is found in the northeastern two-thirds of the continent from the Atlantic to the Great Plains. The wonderful, Minnesota Seasons website says that they are uncommon in that state, at the western edge of their range.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The BugLady couldn\u2019t find a specific explanation for the \u201c<em>thorn-footed<\/em>\u201d part of its name, though it does have a spine on each back leg where the tibia meets the tarsus.&nbsp;<a href=\"https:\/\/www.bugguide.net\/node\/view\/1873689\/bgimage\">Look closely<\/a>.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Not a lot is known about the reproductive (or other) biology of the BTFMW.&nbsp;Females&nbsp;secure caterpillars with their mandibles and then sting and immobilize them.&nbsp;They&nbsp;use or enlarge existing cavities in rotting wood or under bark, and they partition the egg chambers with wood fibers. She may cap the tunnel with a cut piece of leaf. Here\u2019s a nice series of a female caught in the act of working on an <a href=\"https:\/\/www.bugguide.net\/node\/view\/579657\/bgimage\">egg tunnel<\/a>.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is common in the Eumeninae for males to emerge from the egg tunnel before females, sometimes by a week or more, which means that when she oviposits the female must deposit eggs that will develop into females at the far end of her tunnel, and eggs that will be males closer to the front.&nbsp;Magic?&nbsp;You bet!!&nbsp;A fertilized egg will develop into a female, and an unfertilized egg into a male, and&nbsp;<em>she can decide<\/em>, as she\u2019s about to lay an egg, whether to release sperm that will fertilize it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Because some of the moth larvae they cache in their egg cells are agricultural pests&nbsp;(like the Nantucket pine tip moth), BTFMWs are listed as a beneficial species.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">FUN FACT: Like those of many other Hymenopterans, Eumenid larvae can\u2019t poop \u2013 their digestive tracts aren\u2019t \u201chooked up\u201d until they metamorphose into adults.&nbsp;This is probably an adaptation to their spending their larval stage in a \u201clocked room.\u201d&nbsp;If they could defecate, it would be an unhealthy locked room.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>The BugLady<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Howdy, BugFans, Heads up &#8211; We\u2019re venturing into the weeds taxonomically in this episode, but we\u2019ll take it slow, and the BugLady is confident that BugFans can handle it.&nbsp; The BugLady was enjoying the prairie flowers at Riveredge one day &hellip;<\/p>\n","protected":false},"author":40205,"featured_media":17391,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","uwm_wg_additional_authors":[]},"categories":[8],"tags":[1064,792,568,91],"class_list":["post-17390","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bug-of-the-week","tag-black-thorn-footed-mason-wasp","tag-mason-wasp","tag-wasp","tag-wasps"],"uwm_unpublish_requested":false,"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.4 (Yoast SEO v28.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Field Station<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/uwm.edu\/field-station\/bug-of-the-week\/black-thorn-footed-mason-wasp\/\" \/>\n<meta property=\"og:locale\" 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