284 
BRITISH BEES. 
ocelli in a triangle in the centre of the vertex, which is 
broad and slightly convex; antennae short, subclavate, 
geniculated, the scape nearly one-half the length of the 
flagellum and more robust; the first and second joint of 
the flagellum subclavate, the basal one the longest and 
most robust, the remainder short, subequal, and gra¬ 
dually enlarging to the apical one, which is obtuse and 
as long as the basal joint; face flat, slightly convex 
between the insertion of the antennae; cheeks large and 
protuberant; clypeus concave, projecting, lobated in 
front, where it is slightly emarginate in the centre; 
lahrum elongate at its articulation, broader than beyond, 
and from this expansion immediately and abruptly 
contracting, from the inner angles of the contraction 
waving to about three-fourths its length, whence it is 
produced into an equal truncated oblong; mandibles 
bidentate, external tooth acute, inner one obtuse; ciba- 
rial apparatus long; the tongue twice the length of the 
labium, narrowest at its base and obtuse at the ex¬ 
tremity, and clothed with short setae; paraglossae very 
short, coadunate at the base and acuminate; labial palpi 
two-thirds the length of the tongue, with the three first 
joints membranous and flat, conterminous and tapering 
to their extremity, the first joint about one-lialf the 
length of the second, the third twice the length of the 
fourth, which is clavate and articulated within the apex 
of the third; maxillae subhastate and acuminate, as long 
as the tongue; maxillary palpi very short, rather stout, 
the joints subequal and the terminal one acute. Thorax 
oval, convex; prothorax inconspicuous; wing-scales 
rather large; scutellum transversely quadrate, convex ; 
post-scutellum transverse, linear; metathorax gradually 
declining, with a glabrous triangular space at its base; 
