24 THOMAS SAY FOUXDATION 



ary; biicca one-half the eyeheight, with long, soft, 

 mostly pale hairs; back of head with two or three ir- 

 regular rows of black hairs, the i-est pale, abundant 

 and conspicuous ; outer vertical wanting. 



Thorax brownish-black, with 4-6 gray pollinose 

 stripes, of which the subniedian pair are divided be- 

 yond the suture; scutellum uniform brownish-black, 

 convex ; dorsum with fine erect black hair, longer on 

 the humeri, mesopleura, sternopleura, postalar callosi- 

 ties, and sides of scutellum ; calypters dark brown. 



Abdomen shining black; first and second seg- 

 ments with only lateral bristles; third with a stout 

 median marginal pair ; fourth with a strong, irregular 

 marginal row of some 20; fifth sternite blackish, ex- 

 cised U-shape, the arms with some inconspicuous black 

 hairs but not much exposed. 



Hypopygium large ; first segment shining black, 

 with fine erect hair and no bristles; second segment 

 dark red, the sides brownish, hair erect and soft, no 

 bristles ; forceps long, slender, straight, shining black, 

 the sharp tips curving gently forward; from behind 

 they are well separated, slender, parallel. Accessory 

 plate shining black, prominent and rather slender, 

 with almost sharp tip, the hind edge thin and notched 

 near tip; posterior clasper shining black, erect, long, 

 gently curved, with small but distinct apical hook; 

 anterior clasper robust, red at base but shining black 

 apically, strongly curved forward, the tip obliquely 

 truncate to a second shorter point below. Penis red, 

 the division between the basal and distal segments not 

 very distinct; the back plate is deeply cleft at apex 

 into two side plates, which have a minute tooth at 

 tip and a long, curved one forming the anterior apical 

 angle ; below this, on the front of the segment, are two 

 lobes bearing pale hair, and between them is visible 

 the blunt tip of a chitinous organ. 



Legs black ; anterior tibice without bristles except 

 at tip, and on its front side for nearly the whole length 

 with a delicate brush of reddish hairs; middle tibia 

 longer than its femur and a little curved, with one 



