SARCOPHAGA AND ALLIES 221 



Thorax gray pollinose with shght yellowish 

 tinge; the usual three to five black stripes; ps dc 

 four, the anterior two small; ant acr three or four 

 pairs distinct ; prsc one smallish ; stpl three ; scutellmn 

 with two marginal, one small preapical and one small 

 apical. 



Abdomen gray pollinose, tessellated, with three 

 very indistinct changeable stripes. The first three 

 segments with only lateral bristles; fourth segment 

 reddish along the hind edge, with a marginal row of 

 about 12 bristles. 



Hypopygium: First segment large and broad, 

 pollinose and somewhat tessellated above, with a row 

 of about 8 stout bristles ; the ground color varies from 

 yellow to dark brown; second segment red, globose, 

 slightly pollinose above, with erect black hairs but 

 no bristles. Forceps very characteristic in structure, 

 the free part black and polished, the front and back 

 edges parallel in profile, near the tip suddenly bent 

 almost at right angles and bearing at the angle be- 

 hind four or five stiff spines of different sizes as shown 

 in the figure ; accessory plate yellow^, the attached part 

 rather long and broad, the free part pointed. Pos- 

 terior clasper quite straight, shining brown, with a 

 slight bend forward at the tip ; anterior clasper slen- 

 der and strongly curved, shining black; penis with 

 rather slender reddish brown basal joint a little longer 

 than usual; distal segment with a small intermediate 

 subsegment of plain structure, separated off by an 

 evident suture; beyond this it divides into four prin- 

 cipal parts which are unsymmetrically arranged. On 

 the right side is a long brown widening plate with 

 edges turned down partially enclosing a stout black 

 process which ends in a curved sharp point project- 

 ing from under the plate. On the left side there is 

 a short shining brown simple process not much over 

 half as long as the one just described. Between these, 

 attached by a sort of joint that has the appearance of 

 a ball and socket, there is a long one-sided membrane 

 folded at sides but not enclosing any visible structure. 



