190 THOMAS SAY FOUNDATION 



the eyeheight; palpi black or brown, proboscis black. 

 Back of head with two rows of black hairs, the second 

 not very regular, and abundant whitish ones forming 

 a conspicuous beard below. Outer vertical bristles 

 not developed. 



Thorax densely gray poUinose with the usual 3 

 to 5 black stripes very distinct; the submedian polli- 

 nose stripes are narrowly divided before the suture. 

 No ant acr and no prescutellar bristles ; ps ds only two 

 well developed ; stpl two or three ; scutellum with two 

 long marginals, a slender discal pair and a rather erect 

 vertical pair. 



Abdomen densely pollinose, with changeable tes- 

 sellation and three indistinct changeable stripes. First 

 and second segments with only lateral bristles ; third 

 with a median marginal pair ; fourth w^ith a marginal 

 row of about 14. 



Hypopj^gium with the first segment of good size, 

 usually black on the apical half, red on basal half. 

 The black part is pollinose and there is a variable row 

 of bristles on the hind margin. Tlie second segment 

 is red, shining, globose, flat behind, with numerous 

 erect hairs but no bristles. Forceps black; in profile 

 a very distinct, characteristic notch behind at the be- 

 ginning of the free part ; before the middle of the free 

 part they are rather strongly bent backward, curving 

 again forward to a sharp tip. Viewed from behind 

 they diverge sharply near the base and converge 

 slightly near the tips ; posterior claspers slender, short, 

 with a well developed hook on the tip ; anterior clasper 

 larger and longer with about the same kind of a hook ; 

 accessory plate rather small, yellow, shining, with 

 rounded tip ; penis long, straight, black, with a square 

 end, at which there is a process projecting forward in 

 the middle; arising from the front side a little before 

 the tip are a pair of black curved arms reaching for- 

 ward which, in conjunction with the flat and enlarged 

 tip, suggest the figure of a little dog sitting up in the 

 attitude of "begging." The basal joint of the penis 

 is so short as not to be distinguishable; fifth sternite 



