454 



U. S. NATIONAL MUSEUM BULLETIN 216 



PART 3 



Figures 250, 251. — Localities: 250 (left), Mesostenus thoracicus; 251 (right), M. eisenii. 



9. Mesostenus eisenii Ashmead 



FiGUEE 337, d 



Mesostenus eisenii Ashmead, 1894, Proc. California Acad. Scl., ser. 2, vol. 4, p. 

 129; ?. Type: 9, "El Taste," Baja California, Mexico, 3,400 ft. (San 

 Francisco). 



Front wing 5.8 to 6.7 mm. long; clypeus wide, rather strongly con- 

 vex but its apical half flattened or a little impressed, its apical margin 

 straight; temple rather short and strongly convex; dorsal end of pre- 

 pectal carina near midheight of pronotum ; punctm^es on mesopleurum 

 coarse and strong, separated by about 0.4 their diameter; apical carina 

 of propodeum complete, in the female a little raised sublateraUy to 

 form weak crests, between the crests strongly bowed forward; areolet 

 square, about as wide as high; second tergite of female subpolished, 

 with small, sparse punctures that are separated by about 5.0 their 

 diameter; ovipositor sheath about 6.4 as long as front wing; tip of 

 ovipositor about 5.7 as long from nodus to apex as it is deep at nodus. 



Male: Head, body, and hind coxa marked with black, ivory, fulvous, 

 and fuscous as in figm-e 337,d; mouth parts white; antenna black, the 

 scape often brown in front and flagellum with a median dorsal white 

 stripe that covers about 4 segments; front and middle coxae and tro- 

 chanters ivory with fulvous areas or tmges; front and middle legs 

 beyond trochanters fulvous, their fifth tarsal segments brown; hind 

 trochanters, femur, and tibia fulvous, the tibia infuscate dorsally ; hind 

 tarsus fuscous, paler at the joints, its third segment sometimes whitish; 

 wings hyaline. 



Female: Colored like female of M. thoracicus except as follows: 

 Face blackish, white next to eyes; entire prepectus and area below and 

 in front of subtegular ridge black; postscuteUum fulvous or ivory with 

 a fulvous stain. 



