Fossorial Ihjmenoptera of North America. 357 



puncto-striated, freer from hirsuties than in that species; clypeus yel- 

 low, edge produced, angulated, covered densely with a silvery pubes- 

 cence ; basal half of mandibles yellow externally, piceous ; antennae 

 black, broadly dilated, flattened, concave beneath, with no curl of hairs 

 en basal joint of flagellum ; scape yellow, lineatcd above with black. 

 Thorax wholly black, with no yellow markings ; whole surface more 

 than usually coarsely punctured, especially the scutum and scutellum 

 pf mesothorax, and on the propodeum the strife are parallel to the me- 

 sial furrow, rather indistinct though regular, while the transverse ru- 

 gae are almost obsolete. This area is longer and more produced than in 

 T. IcUipes. Fore coxa) black, trochanters dilated towards the tip where 

 are two small spines, thrice as long as broad ; femora broadly dilated, 

 but expansion is longer than broad ; at base two large incurved hooks, 

 yellow ; tibiae dilated iuto a broad leaf-like expansion, nearly as broad 

 as long, concavo-convex, acutely pointed behind, with six acute teeth 

 or lobes ou the edge, yellow ; from the tibia itself radiate to the outer 

 edge and terminate in the lobes like the veins of a cabbage-leaf, nine 

 curvilinear brown lines, the shortest narrowest, the long ones being 

 straighter and broader in the middle ; tarsal joints much as described 

 in T. latipes, yellow, fuscous on the tips and edges ; just above the in- 

 sertion of the legs the thorax more densely covered with silvery pubes- 

 cence ; middle trochanters yellow ; femora yellow, with a black streak 

 on the upper side, joint not so broadly dilated as in T. latipes, tibia; 

 and tarsi yellow ; first tarsal joint twice as long as the remaining ones 

 together; in T. latipes the same joint is hardly one-third longer, ter- 

 minal joiuts fuscous ; hind femora black, tibiae yellow, with an outer 

 black dot; basal joint more than three times as long as the remaining 

 joints together. 



Abdomen long and slender, a little duller in hue than in the pre- 

 ceding species ; a pair of lateral curved, not sinuated fasciae on the ba- 

 sal joint, broadly ovate fasciae on the 2nd joint, more remote than the 

 others; 3rd and 4th pairs nearly contiguous, narrower than the pre- 

 ceding, the 4th divided iuto two fasciae, and not forming a continuous 

 line as in T. latipes; 5th and 6th a continuous line, with a shallow 

 regular sinus in the middle, otherwise the band is not indented on its 

 front edge, which is very straight and parallel; terminal segment broad 

 and spatulate, piceous, with no yellow spot in the centre. On the un- 

 der side of the 2nd abdominal ring are two larger fasciae, comma-shaped, 

 nearly meeting, and on the succeeding ring is a pair of dots; sometimes 

 the fasciae are wanting and only a pair of dots remain. 



