MEXICAN HYMENOPTERA. 7 



and third ; in two specimens the first segment is yellowish except the 

 extreme base, a spot near the tip and the under surface ; venter yellow, 

 with lateral black spots. Form long and rather slender, surface closely 

 punctured, opaque; antennne long and slender; scutellum subconvex ; 

 metathorax rounded above, sloping gradually behind ; areolet of ante- 

 rior wings 5-angular, subtriangular ; abdomen subcyliudrical, basal 

 fovere of second segment very large, with distinct radiating striaa; apex 

 truncate in profile, sub com pressed. Length 5* lines. 

 Three % specimens. (Sumichrast Coll. No. 73.) 



9. Ichneumon Chalco, n. sp. 



% . — Same size, form and sculpture as Tolucn, and very similar in 

 color and markings, differing only as follows: fiice yellowish-white with 

 only a central rounded black spot ; the femora are reddish-fulvous 

 above instead of black, the tibicB and tarsi are tinged with fulvous, 

 tips of the latter blackish ; the wings are yellow-hyaline, and the apical 

 yellow band on second, third and fourth segments of abdomen shade 

 into ferruginous anteriorly. 



?Var. % . — Abdomen ferruginous, banded with yellow, the posterior 

 coxa? with ferruginous spot at tip above and the femora above bright 

 fulvo-ferruginous; tips of tarsi scarcely dusky. 



Two S specimens. (Sumichrast Coll. No. 96.) These may be va- 

 rieties of Toluca. 



10. Ichneumon Alvarado, n. sp. 



S . — Pale lemon-yellow, opaque ; spot covering ocelli, a broad ob- 

 lique line on each side behind summit of eye and confluent behind 

 ocelli, black ; antennae fuscous above, paler in middle, bright ferrugi- 

 nous beneath, dusky at tip, scape beneath pale yellow; mesothorax 

 black, with a lateral and two central yellow lines, the latter abbrevi- 

 ated behind ; line behind collar, apical half of scutellum, its lateral re- 

 gion, postscutellum, basal suture of metathorax, a lateral line, a broad 

 central stripe not reaching the base, and two spots on each side, the 

 posterior one largest and cuneiform, a transverse line beneath wing, 

 connected anteriorly to a slender oblique line, all black ; the markings 

 of the metathorax may be better explained by stating that the upper 

 surface is black, with the smooth, slightly elevated lines yellow, except- 

 ing the posterior transverse one closing the central area ; wings yellow- 

 ish-hyaline, nervures and stigma honey-yellow; legs pale yellow, a 

 large spot on posterior coxas behind, base of trochanters, four anterior 

 femora above except extreme base and apex, apical half of posterior 

 femora above, extending nearly to the base within, and apical third of 



