284 BRITISH BEES. 



ocelli in a triangle in the centre of the vertex, which is 

 broad and slightly convex; antenncB short, subclavate, 

 geniculatedj 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; 

 labrum 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 setse; paraglosscB 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-half the 

 length of the second, the third twice the length of the 

 fourth, which is clavate and articulated within the apex 

 of the third; maxilla 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 ; 



