206 LHE HU MBLE-BEER VIII 
1. PSITHYRUS RUPESTRIS, Fabricius. 
QUEEN.—Large ; length 20-23 mm., expanse 40-45 
mm.; sometimes smaller. 
Black, with the 4th and following segments of the abdomen 
red. The red is less bright than in 4. /apzdarzus. 
There is occasionally a dingy yellowish-grey band 
across the front of the thorax. 
Wings dark brown, thus darker than in any other 
species. 
The 6th dorsal segment is dull and is covered with 
very short red hairs. 
The elevations on the sides of the 6th ventral segment 
are very prominent and form angular wings, which pro- 
ject so far that they can be seen plainly on either side 
when the tip of the abdomen is viewed from above. 
MALE.—Length 15-17 mm., expanse 30-33 mm. 
Head black. Thorax black, usually with indistinct 
yellowish-grey bands in front and behind. Abdomen black ; 
with the sides and edges of the 1st and 2nd segment usually 
more or less yellowish-grey, and with the 4th and follow- 
ing segments red. The red usually extends on to the 
3rd segment where it shades into the black; it is less 
bright than in 5. dapzdarzus. In some specimens there is 
no yellowish-grey on the thorax and abdomen. 
Coat rather long, uneven, and rather coarse. 
Antenne rather short; length of flagellum 5 mm. 
This species may be easily known from the male of ZB. 
derhamellus, which in coloration it much resembles, by 
the thicker and shorter antenne and somewhat longer 
coat. The antenne are thicker than in B. lapzdarius. 
Armature distinct. 
A specimen of the male sent me from Colchester is entirely 
black. Another taken at Ripple has the abdomen red except the 
Ist segment. 
This large species is parasitic on Loméus lapt- 
