ICHNEUMON-FLIES — GELINAE : MESOSTENINI 



463 



with some fine weak transverse wrinkles; basal 0.08 ± of hind tibia not 

 distinctly darker than the subbasal portion; thyridium of second tergite about 

 0.6 as wide as long 2. discoidalis (Cresson) 



1. Messatoporus rufiventris Cushman 



Figure 338,b 



Messatoporus rufiventris Cushman, 1929, Proc. U.S. Nat. Mus., vol. 74, art. 16, 

 p. 11; 9 . Type: 9 , Cabin John, Md. (Washington). 



Front wing of male 4.8 to 6.4 mm. long, of female 6.0 to 7.2 mm. 

 long; apical half of clypeus about as convex as basal half; apical part 

 of flagellum subcylindric, not distinctly compressed; mesoscutum 

 with moderately dense hairs all over; mesoplem-um and metaplem-um 

 polished or subpoHshed, with small punctures that are separated by 

 about22.0 their diameter, the obhque groove setting off upper hind 

 corner of mesopleurum without any wrinkles; thyridium of second 

 tergite about 0.4 as wide as long. 



Male: Colored hke the female except that front and middle legs 

 are paler, fuscous mark on upper side of hind coxa usually larger, hind 

 trochanters often infuscate, infuscation on hind tibia more extensive 

 and stronger, last segment of hind tarsus sometimes entirely white, 

 and abdomen more contrastingly banded with fuscous, in this respect 

 approaching the coloration of M. discoidalis. 



Female: Head, body, and hind coxa marked with black, white and 

 fulvous as in figure 338,b, the coloration of abdomen variable as dis- 

 cussed below; palpi white; scape white except above; flagellmn with a 

 broad white band; mesoscutum with a median white spot that is 

 subcircular but truncate in front; front and middle coxae and tro- 

 chanters whitish, the middle ones more or less pale fulvous; front legs 

 stramineous, the femur fulvous above and often with a weak fuscous 

 stripe above, the last segment of tarsus pale brown; middle leg beyond 



Figure 255. — Localities for 

 Messatoporus rufiventris. 



