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64 Dr. A. S. Packard, Jr's Revision of the 



broader than below, on each side of which are five rugae, directed 

 obliquely outward ; posteriorly with short, transverse slight ridges, 

 becoming larger on the flanks; slightly pilose on the side of the 

 thorax. 



The femora are not much dilated, black, striped above with yellow ; 

 tibiae broadly dilated into a concavo-convex square plate, with the 

 edges as long as broad, corners rounded; front edge straight, much 

 rounded externally, hind edge sinuate, lengthening externally; tibia? 

 themselves yellow, vexhillum brown, paler on the edges, with a few 

 spots and sinuate abbreviated lines near the inner edge, and a yellow 

 spot at base ; tarsal joints large and well developed, basal joint twice 

 as long as broad, the two next very short and broad, fringed externally 

 with a hirsuties, fuscous like the rim of the vexhillum; middle femora 

 black above, yellow beneath, tibia? entirely yellow, middle tarsi broad 

 and fuscous; hind femora black; tibia? with rows of spines; tarsi 

 fuscous. Abdomen smooth, as long as the rest of the body, arcuate, 

 elongated ovate, basal joint a little swollen above; four large, slightly 

 sinuate, yellow, lateral, remote fasciae; tip broad spatulate, brown. 



Length of body, .36; head and thorax together, .18; abdomen, .18 

 inch. 



This is a larger and stouter species than the succeeding members of 

 the genus, and by its cubical head, nearly simple antenna?, simple 

 squarish vexhillum and normal well developed fore tarsi, combines the 

 characters of the two sections of the genus. The wing characters, the 

 nodosities of the basal joint of the abdomen, together with the general 

 shape of this region, ally it somewhat closely to T. tumidus, from 

 which it is sufficiently distinct in its black scape, which is not clavate, 

 but rather obscurely fusiform, and by its black and more coarsely 

 punctured body; the basal joint of the abdomen is also fasciate where 

 in T. tumidus it is unspotted. 

 Thyreopus tumidus, n. sp. 



% . Head cuboidal, very finely punctured, black, lower part of the 

 front near the clypeus covered broadly with a silvery pubescence ; 

 mandibles yellow, corneous towards tip; antennae black, secoud joint 

 yellow, with an oval black-brown spot on the inside, so that when the 

 autenua? are appressed to the front, the two spots unite to form a 

 mitre-shaped spot. Thorax finely punctured; prothorax with three 

 dots, sometimes obsolete, on each side, one near the middle of the 

 scutellum, the other two on the sides, which are often obsolete; a yel- 

 low spot on each side of the mesothorax. Enclosure of the propodeum 

 distinct, and deeply furrowed. 



