HYMENOPTERA. 353 



aud of pale yellow behind ; the posterior femora incrassate, very 

 broad at their base, which is produced and rounded posteriorly ; 

 beneath, the segments of the abdomen are fringed with long 

 yellow pubescence. 



Hab. Silhet. 



53. Xylocopa acutipennis. B.M. 

 Male. Length 10 lines. — Black, head much narrower than 



the thorax ; eyes very large ; the scape in front, the clypeus, a 

 triangular shape above it, the labrum, and a minute spot at the 

 base of the mandibles, yellow; the vertex covered with a brownish 

 black pubescence, the disk of the thorax smooth and shining in 

 the middle, the sides densely clothed with a short black pubes- 

 cence, the mesothorax in front obscurely yellow ; beneath, 

 the thorax and cheeks are covered with pale yellow pubes- 

 cence, having in parts a ferruginous stain; the legs beneath 

 are of a dark rufo-testaceous colour; the femora compressed 

 beneath, the posterior pair being broadly grooved longitudinally, 

 and produced at the basal extremity into two sharp angular pro- 

 jections ; the posterior tibise deeply notched beneath, and pro- 

 duced at their apex into a broad flattened tooth or spine ; the 

 anterior tarsi densely clothed with bright golden-yellow pubes- 

 cence, the intermediate pair with ferruginous, and the posterior 

 pair with black above, and with obscure ferruginous beneath. 

 Abdomen : the basal segment covered with black pubescence, and 

 the apex densely fringed with long blackish-brown pubescence ; 

 the apex rufo-piceous. 



Hab. Silhet. 



54. Xylocopa basalis. B.M. 



Female. Length 6|-8 lines. — Black, the face densely covered 

 with a short cinereous pubescence^ the antennae ferruginous ; the 

 face depressed in front of the posterior ocelli, forming a sharp 

 transverse edge; a tubercle in front of the anterior ocellus. 

 Thorax shining, the wings hyaline at their base to about one- 

 third of their length, beyond which they are dark purple, the 

 apical margins paler, the legs entirely black ; the abdomen black, 

 shining and closely punctured, the apex fringed with pale pu- 

 bescence. 



Male. — Closely resembling the female, but having a fulvous 

 pubescence on the clj^jeus; a tuft of white })ubescence before 

 the wings, and another on each side of the basal segment of the 

 abdomen; the posterior tibiae slightly curved, the basal joint of 

 the tibiae incrassate, and having a tuft of white pubescence at the 



