NATURAL SCIENCES OP PHILADELPHIA. 391 



5. Mesoleptus imbecillis. 



Mesoleptus imbecillis, Cress., Trans. Am. Ent. Soc, ii. p. 34, % . 



Cordova. 



6. Mesoleptus emaceratus. 



Mesoleptus emaceratus, Cress., Trans. Am. Ent. Soc, ii. p. 35, %. 



Orizaba. 



7. Mesoleptus decorosus. 



Mesoleptus decorosus, Cress., Trans. Am. Ent. Soc, ii. p. 35, %. 



Orizaba. 



8. Mesoleptus ? bucephalus. 



Mesoleptus? bucephalus, Cress., Trans. Am. Ent. Soc, ii. p. 36, '^. 



Cordova. 



9. Mesoleptus? anguina, n. sp. 



9 . Head and thorax whitish ; large ovate mark above antennae 

 extending from their base to back of occiput, posterior margin of 

 latter, antennae (except annulus, and scape beneath, which are 

 white), mesothorax except two central stripes, scutellar region, 

 middle of metathorax, broadly and suddenly dilated at base, a 

 spot on each side anteriorly, spot at base of posterior coxae, their 

 trochanters above, line on first abdominal segment, base of second 

 and a stripe on each side of this and the following segments, black ; 

 legs and abdomen tinged with honey-yellow ; coxae, trochanters, 

 and first abdominal segment whitish ; wings hyaline, iridescent, 

 nervures brownish. Smooth and polished ; head large, subglobose, 

 cheeks broad, convex : clypeus large, convex, apex truncate ; eyes 

 rather small, ovate ; antennae about as long as body, slender, fla- 

 gellum slightly thickened at tips ; scutellum smooth and convex ; 

 metathorax rounded above, with a transverse arcuate carina near 

 base and another near apex ; wings narrow, areolet incomplete, 

 the outer nervure wanting, stigma small ; legs long, slender, sim- 

 ple, claws simple ; abdomen long and slender, especially so at 

 base, arched in profile, the two basal segments long, the second 

 the longer, with large oblique gastrocaeli ; ovipositor short. 

 Length 3|- lines. 



Orizaba. 



Genus TRYPHON, Grav. 

 1. Tryphon mexicanus, n. .sp. 



% . Black ; mandibles, palpi, tegulae, and four anterior coxje and 

 trochanters very pale lemon-yellow or yellowish-white ; antennae 



