MEXICAN HYMENOPTERA. 19 



densely punctured; scutellura elevated, sides and apex abrupt; meta- 

 thorax rounded above, sloping behind, lateral tubercle long and acute; 

 areolet of wing triangular; basal foveas of second segment transverse, 

 rather large. Length G — 7 lines. 



Two % , two 9 specimens. (Sumichrast Coll. No. 6.) 

 :>(?. Ichneumon chichimecus. n. sp. 



S . — Bright lemon-yellow, clothed with short pubescence; transverse 

 spot covering ocelli and extending to base of antennae, transverse mark 

 on occiput, antennae above, two spots on prothorax in front, mesothorax 

 except two central longitudinal lines abbreviated behind, tip and late- 

 ral region of scutellura, sutures of pleura, basal suture of metathorax, 

 a large mark on each side at base, irregularly and obliquely continued to 

 the apical angle, bilobed mark on posterior coxae behind, all the femora 

 behind, line on posterior tibiae behind, their tarsi entirely, the ab- 

 domen above except base of first segment, and regular, rather narrow 

 apical and lateral margins of all the segments, black ; sometimes 

 the subapical black spot on first segment is more or less separated into 

 three lines or spots ; antennae beneath fulvous, dusky at tips, scape yel- 

 low beneath ; wings pale yellow-hyaline, nervures brown, stigma yel- 

 low. Head broad, cheeks full, convex ; antennae as long or nearly as 

 long as body, subserrate, slender at tips ; mesothorax and abdomen 

 above very densely punctured or shagreened; scutellum convex, smooth 

 and polished ; metathorax pubescent, short, abrupt behind, elevated 

 lines well-defined, lateral tubercle small and subacute ; pleura and 

 sides of metathorax polished; areolet of wing 5-angular; abdomen more 

 or less clavate, second segment depressed, basal foveas longitudinal and 

 aciculated. Length 4i — 5 2 lines. 



Six % specimens. 

 37. Ichneumon lenis, n. s}!. 



$ . — Color and marking as in t)-affict(s (No. 19), except as follows : 

 the vertex is entirely black except narrow orbits, the antennae have a 

 broad white annulus, the prothorax is black except narrow margins, 

 the yellow lines on mesothorax are narrower, not dilated in front and 

 sometimes abbreviated, the pleura has an oblique black line beneath 

 the wing, no black spot at tip of metathorax, all the femora have a 

 blackish line above, and the slender portion of first abdominal segment 

 is black above and beneath, that above sometimes extending onto the 

 dilated apex. Form much the same as that of trajicus, but the head 

 is smaller, the antennas longer, the metathorax has a stout subacute 

 lateral tubercle, and the abdomen above has no perceptible raised dor- 

 sal line. Length 6 J lines. 



