450 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.53 



twice the length of the stigmal) ; funicle 5 is a little longer than wide, 

 a half longer than wide, and the distal half of the caudal tibia is sub- 

 metallic. Spiracle round, at cephalic margin. 



From two females mounted with aureipes. 



Types. — Cat. No. 20422, U.S.N.M., two females on tags and a slide 

 as noted above. 



TRYDVMUS APHIDIS, new species. 



Female. — Like rohiniaecola Ashmead, but the propodeum is shorter, 

 and subglabrous, the caudal tibiae have the distal half white (not 

 the tip only), bearing a rather narrow cinctus near middle, the abdo- 

 men slender and cyUndrical while the male has the legs all pale ex- 

 cept the coxae (colored like the female in the other species, except 

 the tibiae). Mandibles 4-dentate. Propodeum with an obhque, 

 longer than wide fovea at apex (caudad) near the meson. 



From one male, three females reared from Lasioptera vitis, July 

 1887, New York (Lintner). 



Types. — Cat. No. 20420, U.S.N.M., a pair on tags, a female head 

 and caudal legs on a slide. 



