MEXICAN HYMENOPTERA. 11 



flattened, the latter slender, with the tip broadly dilated, depressed, 

 shining, with scattered punctures ; second and third segments densely 

 and deeply punctured, except the apex which is smooth and polished 

 as well as the whole of remaining segments. Length 4 lines. 



One S specimen. Has much the general form of Hoplismenus. 



18. Ichneumon frivolus, n. sp. 



% . — Uniformly ferruginous; orbits and face faintly yellowish; an- 

 tennae black, with a white annulus about the middle, scape ferrugi- 

 nous; wings hyaline, iridescent, nervures and stigma black; sutures of 

 pleura, extreme tip of metathorax, and tips of tarsi, blackish ; tarsi 

 pale ferruginous. Small, form slender, eyes large, cheeks prominent, 

 antennfe as long as the body, slender at tips ; thorax closely punctured; 

 scutellum very convex, sides carinated, apex abrupt; metathorax ob- 

 liquely truncate behind, rugulose, the elevated lines sharply defined; 

 wings ample, stigma large, areolet subtriangular ; abdomen densely 

 punctured, roughly so at base of second segment, apex smoother and 

 shining. Length 3 lines. 



One % specimen. 



19. Iclineumon tragicus, n. sp. 



% . — Lemon-yellow, opaque; a large mark on vertex, covering the 

 ocelli and confluent with a broad, transverse, arcuate line on occiput, 

 antennfB except basal joints, large spot on each side of prothorax, three 

 broad lines on mesothorax almost confluent before the middle, base and 

 sides of scutellum, basal suture of metathorax, a small spot on each 

 side at base above, confluent with a much larger spot behind, a spot be- 

 fore the insertion of the abdomen, a line beneath the anterior winas, 

 spot on posterior coxae behind, line on their femora above, their troc- 

 hanters above, their tibiae except tips beneath, their tarsi entirely, a 

 spot near tip of first abdominal segment, base of the following segments, 

 very broad on the second segment and becoming narrower towards the 

 tip, black ; wings yellowish-hyaline, nervures and stigma honey -yellow; 

 legs tinged with honey-yellow. Head large, broad, not narrowed be- 

 neath, cheeks full and polished ; face sparsely punctured, anterior mar- 

 gin of clypeus truncate ; antennae longer than head and thorax, slen- 

 der, the joints not distinctly defined, subpubescent ; thorax densely 

 punctured ; scutellum strongly elevated behind, carinated on the sides 

 and emarginate at tip, the sides and tip very abrupt; metathorax densely 

 punctured, without any distinct elevated lines ; areolet of anterior wing 

 triangular; abdomen depressed, longitudinally rugose, first segment 



