208 TEE HUMBLE-BEE Vill 
2. PSITHYRUS VESTALIS, Foucrier. 
QUEEN.—Large ; length 20-22 mm., expanse 40-43 
mm. ; sometimes smaller. 
Head black. Thorax black, with a deep yellow (often 
brownish-yellow) band in front. Abdomen black; with the 
3rd segment lemon-yellow on the sides, except at the base, 
4th segment white, 5th segment white on the sides. The 
deep yellow band on the thorax is often narrow and 
darkened, 
6th dorsal segment shining. 
The elevations on the sides of the 6th ventral segment 
are ridge-like and rounded, and converge toward the apex 
but they do not nearly meet there, and the space between 
them there is thickly covered with short, velvety, golden 
hairs. 
MALE.—Length 15-17 mm., expanse 30-33 mm. 
Head black, often with a few yellow hairs on top. 
Thorax black, with a yellow band in front and sometimes a 
few yellow hairs behind. Abdomen black ; with sometimes 
the Ist segment yellow (this band is not very prominent 
owing to the paucity of the hairs); with the 3rd segment 
yellow, but black in the middle at the base; and with 
the 4th and 5th segments white, the 6th segment more or 
less black in the middle and white at the sides, and the 
7th more or less black. 
Coat rather short ; and differing from that of every other 
species of Psz¢hyrus in being even, not shaggy. 
Antenne long and thick; length of flagellum 6 mm. 
The 8rd joint of the antenne is much shorter than the 5th 
joint, which almost equals the 3rd and 4th together. 
Armature very like that of Ps. dzstznctus, but the inner 
border of the forceps is densely fringed with short stiff 
hairs. 
This species preys on Lombus terrestris. It is 
very common in the south and east of England, and 
