136 The Nests of Bees of the genus Trif/ona. 



dusky. Possibly this is due to staining. All the males 

 have it fuscous at the apex, with the base clear yellow. 

 The apices of the genitalia are nearly always visible. The 

 form of the posterior legs is almost identical in the male 

 and worker, but the hairs forming the fringe on the upper 

 margin of the tibise in the worker are white and brush- 

 like at the tip, whereas in the male they are nearly all 

 simple. 



The type specimens of this species, which are from N. W. 

 India, have the antennse rusty-red. All the males from 

 the nest above described have them dark -brown, nearly 

 black. In the workers the scape is clear yellow, and the 

 flagellum light-brown. 



Explanation of Plate VI. 



Nest of Tri<jona colliiia, about one-fourth natural size. 

 P, P, cliambevs filled with pollen. 

 R, E, solid resin. 



