SAKCOPHxVGA AND ALLIES 103 



brown, reaching three-fourths of the distance to vi- 

 brissa?; third joint rather slender, fully twice the sec- 

 ond; arista rather long, plumose on the basal half or 

 more. Vibriss^e at the oral margin. Palpi yellow; 

 proboscis brown, retracted, small; front of head 

 rather reddish in ground color; bucca one-fourth the 

 eyeheight ; back of head with three rows of black hairs 

 and rather abundant pale beard which does not quite 

 reach the margin of the mouth. Outer vertical bris- 

 tles absent. 



Thorax gray pollinose with the usual 3-5 black 

 stripes; 3 ps dc; 2 pairs ant acr; prsc rather large; 

 scute! lum with two large marginals, one small pre- 

 apical, and one small apical. 



Abdomen whitish gray pollinose, with distinct 

 median black line and changeable lateral line each 

 side; first segment with only lateral bristles; second 

 segment the same but with small depressed bristles 

 along the hind margin, the middle pair somewhat 

 larger; third segment with a row of about 12; fourth 

 segment with a row of about 16; genitalia minute; 

 first segment opaque, pollinose, black, with a row of 

 coarse hairs or small bristles near its apex; second 

 segment very small, rather reddish than black, with- 

 out noticeable hairs ; forceps are slender, yellow, deli- 

 cate and rather square at tip. Behind them there is 

 on each side a prominent yellow lobe which really is a 

 part of their base, bearing a striking tuft of straight 

 black hairs twice as long as the forceps themselves. 

 These tufts are concealed in the ordinary position of 

 the organ and are different from anything occurring 

 in the related species so far as known. Posterior 

 clasper flat, slender, yellow, with a minute straight 

 black tooth at tip ; anterior clasper dark brown, rather 

 heavy and blunt, with several hairs near the apex; 

 fifth sternite V-sliaped, inner edges with pubescence 

 and scattering slender black liairs. 



Legs ])lack; middle femur witli a few stout 

 spines, hardly forming a comb; middle ti])ia with one 



