106 THOMAS SAY FOUNDATION 



brown, very short; back of head with three rows of 

 coarse, rather erect black hairs, the pale beard not 

 abundant; outer vertical bristles barely larger than 

 adjacent hairs. 



Thorax gray with the usual 3-5 black stripes; 3 

 ps dc; 3 stpl; anterior acrostichals strikingly large; 3 

 pairs; prescutellar 2 small pairs; scutellum with 2 

 large marginals, 1 small subapical, 1 long, decussate 

 apical pair. 



Abdomen gray, somewhat changeable, with one 

 permanent median black stripe and on each side a 

 subpermanent one; first and second segments Math 

 only lateral bristles, third with a row of 10, fourth 

 with 14. 



Hypopygium dark, minute, opaque; first seg- 

 ment in the specimen almost invisible; second brown 

 or reddish-brown, more red around anal area, with 

 rather abundant but not striking hair; forceps pale 

 yellow, rather thin and bladelike, not diverging at tip ; 

 accessory plates with slender tip; penis with yellow 

 basal segment, the apical one long, slender at base for 

 half its length, then with two lateral flap-like lobes 

 extending forward, the terminal part flat, shining, 

 truncate; fifth sternite concealed. 



Legs black, rather stout ; middle f emm* with pos- 

 terior comb of spines on lower edge near apex; mid- 

 dle tibia with one bristle on outer front side ; hind tibia 

 without villosity. 



Wings hyaline; no costal spine; third costal seg- 

 ment equal to fifth; first vein bare, third hairy two- 

 thirds of the way to the crossvein. 



Female. General color cinereous; front .277 of 

 head (average of two, — .273 and .281) ; 7 or 8 front- 

 als, the lower reaching the middle of second anten- 

 nal joint as in male; parafacial hairs few and small; 

 outer vertical strong; scutellum with two very large 

 marginal, one very small subapical; genital segment 

 of abdomen gray, opaque, the opening oval, filled by 

 the basal part of the larvipositor, which is a modified 

 sixth sternite; it protrudes in sword shape (in profile. 



