MEXICAN HYMENOPTERA. 15 



cal margins of all the dorsal segments, and the venter entirely, yellow- 

 ish-white. Form long and slender ; head large, subquadrate, anterior 

 margin of clypeus bisinuate, pointed in the middle j mesothorax shin- 

 ing, finely and sparsely punctured ; metathorax rounded above, rather 

 abrupt behind, with two short acute spines above, the surface trans- 

 versly rugulose on each side of the middle, bounded by an angular ele- 

 vated line; posterior legs unusually long; abdomen long and narrow, 

 subdepressed, closely punctured, subpubescent; first segment with an 

 obtuse tubercle on each side near the tip ; second segment much de- 

 pressed on each side of the middle. Length 82 lines. 

 One S specimen. (Sumichrast Coll. No. 25.) 



26. Ichneumon tenebricus, n. sp. 



% 9 . — Whitish ; vertex, occiput, tips of mandibles, antennae, except 

 a white spot on scape in front and a white annulus about the middle, 

 prothorax. except upper and lower margins, mesothorax entirely, lateral 

 region of scutellum, sutural line at base of metathorax, a broad stripe 

 on each side above, reaching to the lateral tubercles, a stripe down the 

 middle of posterior truncation, spot on outside of coxae, a line on tro- 

 chanters above, line on all the femora above, and the abdominal seg- 

 ments above except the lateral and broad apical margins, black; tibiae, 

 especially the posterior pair, tinged with fulvous, dusky outwardly at 

 base, four anterior tarsi dusky, posterior pair whitish, dusky or fulvous 

 at base and tip ; wings hyaline, faintly tinged with yellowish, nervures 

 black, stigma more or less luteous. Form slender, head subquadrate, 

 shining; clypeus flat, rounded at tip; mesothorax sparsely punctured; 

 scutellum flat ; metathorax rugosely punctured, with a short acute spine 

 on each side above ; areolet of wings triangular ; abdomen above finely 

 and densely punctured. Length 6 — 7 lines. 



Two 9 , four % specimens. (Sumichrast Coll. Nos. 62, 91 and 92.) 



27. Ichneumon intentus, n. sp. 



% . — Color and markings as in tenehricus % , except that the scape 

 is entirely black ; there is a white line on each side of mesothorax, 

 above tegulce ; tip of metathorax without black spot ; posterior tibise 

 and tarsi entirely yellow, the former tinged with orange; basal seg- 

 ment of abdomen broadly white before the base. Shaped like that of 

 tenehricus % , but more slender, the abdomen being cylindrical ; cly- 

 peus bisinuate anteriorly ; basal middle of metathorax smooth and pol- 

 ished, lateral tubercles small and obtuse. Length 6 lines. 



One % specimen. 



