APID.E. 



3SS 



of the genus is similar to that of Bomhus. There are five 

 British species which may be distinguished thus : — 



(2) 1. Fourth and following segments of the 



abdomen clothed with red hairs in both 



sexes EUPESiRls. 



(1) 2. Fourth and following segments not all 

 clothed with red hairs. 



(4) 3. (J with the abdomen subglobose, its 



extreme apex clothed with fulvous 

 hairs; ? with the extreme apex of the 

 sixth ventral segment armed with a 

 pointed process qdadricoloe. 



(3) 4. (J with llie abdomen suhtriangular, its 



extreme apex clothed with black hairs; 

 $ with the apex of the sixth segment 

 simple. 



(6) 5. Posterior metatarsi in both sexes as wide 



aa the tibise, the apical white hairs of 

 the abdomen usually separated from 

 the basal black ones by a line of yellow ; 

 (J sagitta3 not toothed beneath ; scu- 

 tellar hairs in the ? black . . . VESTALIS. 



(5) 6. Posterior metatarsi narrower than the 



tibiffi ; no line of yellow pubescence 

 between the black and white ; (J sagittas 

 toothed beneath ; scutellar hairs of the 



? , except in black variety of cainpestris, 

 yellow. 

 (8) 7. Hairs of the apical segments of the ab- 

 domen black or yellow ; ^J with the sixth 

 ventral segment simple, with a pencil" 

 of long black hairs on each side; 



$ , sixth dorsal segment shining at 

 the base camfestbis. 



(7) 8. Hairs of the apical segments white, 



sixth ventral segment in the (J with a 

 distinct apical callosity on each siJe ; 

 ? with the sixth dorsal segment 

 rugosely punctured .... Bajibutellus. 



P. rupeBtria, Fab. {AlbinelluSyEirb. c?). — Black, clothed 

 with black hairs, those of the fourth and following seg- 

 ments of the abdomen red in both sexes, those of the 

 thorax and basal segments of the abdomen often, and those 

 at the sides of the second and third rarely, more or less 

 greyish in the J ; wings very slightly smoky in the cJ, dark 

 blackish-brown with blucish reflections in the ? ; antenna) in 



