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



Length of body, .4-2; head and thorax, .20; abdomen, .22 inch. 



Colorado Terr., (Coll. Ent. Soc. Phil.). 



Besides the much longer, slenderer, and more coarsely punctured 

 body, the more broadly dilated antennae, and narrower posterior part 

 of the head, and the different mode of sculpturing on the propocleum, 

 this species differs in other respects from T. latipes as in the structure of 

 the legs, and the coloration as above described. The expansion on the 

 fore tibiae is shaped somewhat like a cabbage-leaf, the broad veins be- 

 ing represented by the curved dark lines. There is no sieve-like ar- 

 rangement of transparent dots, no dots whatever being present. Seen 

 laterally when the limb is appressed to the body, the plate is seen to be 

 broader, its upper edge remarkably dentate; and the anterior half of 

 the tibial joint above is yellow, where in T. latipes the entire joint is 

 yellow externally. Also the striking differences in the coloration of 

 the thorax and of the abdomen, where the fasciae on the 4th ring take 

 the place of the continuous one present in T. latipes, and the very even 

 bands, not indented on their front edge, as also the presence of 

 the fasciae and dots on the under side of the abdomen, together with 

 the striking differences in the comparative length of the tarsal joint, 

 serve to distinguish the two species. Though the present species is 

 slenderer than the other, the thorax is not so high and is more elon- 

 gated; the sides of the abdomen are unusually parallel, being thus ob- 

 long, where in T. latipes the form is more ovate. 



Thyreopus cribrellifer, n. so. 



% . Head finely puncto-striated ; body finely punctured; head black, 

 between the eyes covered sparsely with a thin pubescence ; orbits nar- 

 rowly lined with a silvery pubescence ; mandibles yellowish testaceous 

 at base. Antennae black with a slender scape, joints of flagellum ex- 

 panded broadly on the sides, so that the outline of the flagellum is fusi- 

 form when seen from above, the basal joint being broader than long, 

 beneath flattened concave, with a curl of silvery hairs on the 2nd joint, 

 terminal joint long, tapering, cylindrical. Thorax finely punctured, 

 propodeum coarsely rugose, with a median, deep, straight furrow, and 

 a lateral net-work of high, raised, irregular ridges; entirely black, ex- 

 cept two remote dots on each angle of the prothorax. The tubercle is 

 often black, but generally yellow. Fore trochanters dark fuscous, 

 ringed with yellow at tip; femora twice as long as broad, angular, flat- 

 tened beneath and at base, provided with a long curved spine nearly 

 half as long as the femora ; above, the scutellate expansion, or vexhillum, 

 spreads out posteriorly into a long, broad, obtuse point, longer than 



