MEGACniLE. 71 



29. Megacliile opifex. 



Female. Length lines. — Black ; the legs ferruginous, clothed with 

 fulvous pubescence ; that on the cheeks, the thorax beneath, and on 

 the basal segments of the abdomen beneath whitish, that on the 

 terminal segments bright fulvous. The mandibles obscurely fer- 

 ruginous at their apex, the flagellum fulvous beneath. The 

 wings fulvo-hyaline, the nervures ferruginous, the tegula) pale 

 rufo-testaceous. The abdomen covered with short fulvous pubes- 

 cence, the margins of the segments having fascia of the samo 

 colour, but more dense and longer ; the apical segment with short 

 cinereous pubescence, and sprinkled with black hairs. 



Male. A little smaller than the female, which it closely resembles ; 

 black, with the legs ferniginous, the wings being the same ; the 

 anterior tarsi dilated, and thickly fringed behind with white pubes- 

 cence, which is bordered with ferruginous. 



Hah. St. Paulo, on the Amazons. 



This species closely resembles M. pulchra, from which the female 

 differs in having the abdomen black ; the male is distinguished by 

 the different form of the dilated joints of the anterior tarsus, the 

 first joint being oblong and widest at its apex, but has not the pro- 

 duced appendage found in M. pulchra. 



30. Megacliile pallipes. 



Male. Length 6 lines. — Black, the legs ferruginous, with the tarsi 

 yellow. The face with bright golden-yellow pubescence ; the an- 

 tenna) black, with the apical joint compressed and dilated. The 

 pubescence on the disk of the thorax dense, short, and of a bright 

 golden yellow, on the metathorax it is paler and beneath whitish ; 

 wings fulvo-hyaline, the nervures ferruginous, the tcgulae rufo- 

 testaceous ; the anterior tarsi dilated, fringed behind with white 

 pubescence, which is fuscous beneath; the anterior coxae with 

 black spines. The apical margins of the first to fourth segments of 

 the abdomen with narrow fasciae of fulvous pubescence ; the sixth 

 segment covered with white pubescence, its apical margin notched 

 in the middle, the segments beneath fringed with white pubes- 

 cence. 



Hab. St. Paulo, on the Amazons. 



31. Megachiie crassipes. 



Male, Length 6 lines. — Black, with the posterior femora incrassate. 

 The face with pale pubescence from the clypeus to the anterior 

 ocellus ; on the vertex it is cinereous, and on the clypeus white, 

 with a transverse line of black ; the flagellum fulvous beneath. 

 The thorax with cinereous pubescence ; the wings fulvo-hyaline, the 

 nervures ferruginous, the tegailec rufo-testaceous ; the anterior legs 



