XXY. PASSALGCUS. 19] 
cent; the legs black, with the anterior pair within, their tarsi, 
and the knees and tarsi of the intermediate, rufescent, and a 
pale luteous ring at the base of the posterior tibie. 
The abdomen very black and shiny; and the margins of the 
first three segments constricted 9. 
The g¢ differs only in having a silvery pubescence on the face 
and clypeus ; the metathorax more rugose, and those portions, 
which are rufescent in the legs of the 9, in this sex luteous ; 
and the ring at the base of the posterior tibiz pale yellow, as 
are also sometimes the tubercles. 
g Q in my own Collection. 
4+ I have met with this species not uncommonly in 
Battersea Fields, and likewise at Highgate. Mr. F. Walker 
possesses a remarkable specimen of the ¢, in which the 
first transverse cubital nervure is wanting on both sides. 
Sp. 3. cornicer. ‘ N. Sp. 
ater, corniculo inter antennas porrecto 9 ; obsoleto ¢. 
length 2—3 lines. 
Head black, punctured, slightly shining; an impressed line 
extending from the anterior stemma to the acute spine which 
stands in the centre of the face just above the insertion of the 
antennz, the scape of which is fulvous or rufescent, either 
entirely in front or at its base and apex merely; the clypeus 
distinctly tridentate; the central tooth the largest; the labrum 
semicircular, convex; mandibles tridentate, rufescent at the 
apex ; the palpi fulvous. 
The thorax black, punctured, slightly shining; the epaulets 
of the tegulz consute, and a slight scratch parallel with their 
middle, a consute longitudinal line on each side towards the 
middle extending from the base to the apex, within which at the 
base there are two slight abbreviated elevated lines; the meta- 
thorax very rugose ; the tegulz piceous; the tubercles generally 
