MEXICAN HYMENOPTERA. 13 



outwardly ; abdomen with the segments above rather deeply incised at 

 base, the first segment elevated and uneven near the apex. One S 

 specimen differs from the others in the shape of the scutellum, which 

 in this is elevated on the sides and excavate at tip as well as at base. 

 Length 5 — 6 lines. 



Six 9 , two % specimens. (Sumichrast Coll. Nos, 36, 37 and 56.) 



22. Ichneumon Montezuma, n. sp. 



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

 ocelli and confluent with a larger mark on occiput, tips of mandibles, 

 antennne, except ba.sal joint beneath, a dot on each side of prothorax, 

 three broad lines on mesothorax, the middle one reaching to about the 

 center, basal incisure of metathorax, spot on posterior coxte at tip be- 

 hind, and their tibire and tarsi entirely, black 5 wings hyaline, faintly 

 tinged with yellowish, the apex slightly fuliginous, nervures and stigma 

 black. Head broad, not narrowed beneath ; anterior margin of clypeus 

 truncate ; antennae nearly as long as the body, slender at tips, subser- 

 rate, the joints indistinctly defined ; thorax closely punctured, the scu- 

 tellum very convex, clothed with erect black pubescence; metathorax 

 rugulose, somewhat uneven, clothed with fine yellow pubescence, the 

 basal middle with a large, not deeply impressed fovea, the apex trun- 

 cate; areolet of anterior wing small, 5-angular ; abdomen depressed, 

 densely sculptured, thinly clothed with short black pubescence, a slight- 

 ly elevated line down the middle of second and following segments. 

 Length 7 lines. 



One S specimen. (Sumichrast Coll. No. 57.) Looks much like a 

 Tro(jus. 



23. Ichneumon Nestor, n. sp. 



9 . — Color and markings similar to those of fepanecus, but differ as 

 follows : the posterior orbits are interrupted above, and much more di- 

 lated below ; the mesothorax is without any longitudinal white lines on 

 the disk, but have a whitish line over the tegulge, confluent with the 

 spot behind ; the metathorax have only two spots at base ; the pleura 

 has two small spots beneath the anterior wing, and a large mark extend- 

 ing beneath and indented anteriorly by a large black mark behind each 

 anterior coxa ; the legs are yellowish-white, the posterior coxae at base 

 beneath and an irregular mark on the outside, the posterior trochanters, 

 the four anterior femora behind, the posterior pair above, the intermedi- 

 ate tibiae behind and their tarsi, base and tip of posterior pair and a 

 line within, all black; the first abdominal segment has an additional 

 white band on the dorsal middle, and the extreme lateral margins of 



