190 THOMAS SAY FOUNDATIOIS'^ 



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 pollinose 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 with a marginal 

 row of about 14. 



Hypopygium 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 nmiierous 

 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. View^ed from behind 

 they diverge sharply near the base and converge 

 slightly near the tips ; posterior claspers sl,ender, 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, ])lack, 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 



