388 PROCEEDINGS OF THE ACADEMY OF 



mediate pair, except base, blackish, tips of posterior tibiae blackish, 

 apical half of first joint of their tai'si, as well as the second and 

 third joints, white ; abdomen gradually darker from tip of second 

 segment to apox. Length 5i lines. 



Orizaba. (Sumichrast, No. 39 9, 145 I.) 



Genus MESOCIIORUS, Grav. 



Mesoehorus totanacus, n. sp. 



9 . Pale hone3'-3'ellow,metathorax and abdomen darker, smooth, 

 and polished ; tips of mandibles, antennae except base, first seg- 

 ment of /abdomen, and basal half of second, black ; wings hyaline, 

 iridescent, nervures and stigma blackish ; tips of posterior femora, 

 of their tibiae, and of all the tarsi, dusky; head large, transverse, 

 face broad, prominent beneath antennae, eyes small, ovate, cheeks 

 large, convex; antennae slender (broken off beyond joint 9); 

 mesothorax convex, slightly protubei'ant anteriorly; metathorax 

 rounded, convex, with sharply-defined elevated lines, forming 

 areas, the central one elongate, rather large ; wings ample, stigma 

 large, areolet large, rhomboidal; legs slender; abdomen flattened 

 at base, compressed at tip ; ovipositor short. Length 2j lines. 



Orizaba. 



Genus PRISTOMERUS, Curtis. 



Pristomerus mexicanus, n. sp. 



% . Black, shining ; clj'peus honey-3'ellow ; mandibles, except 

 tips and palpi, pale yellowish ; scape pale ferruginous ; sides of 

 mesothorax ferruginous, scutellum paler ; tegulae j'ellowish ; meta- 

 thorax with well-defined elevated lines, forming several differently 

 shaped cells, the central one elongate, w'idened near apex ; wings 

 hyaline, iridescent, nervures and stigma black ; four anterior logs 

 yellow^, their coxae and femora honey -yellow; posterior coxa? black, 

 their tips yellowish, their femora and tibiiu brown or blackish- 

 brown, extreme base and apex of the femora and middle of the 

 tibiae yellowish, their tarsi fuscous pale at base; posterior tro- 

 chanters pale at tips, femoral tooth long and stout, between it 

 and the tip several very fine serratures ; apical half of first ab- 

 dominal segment and ver^'^ narrow apical margin of first and 

 second segments, sometimes obsolete, pale ^'cUowish. Length '61 

 lines. 



Mirador. 



