﻿BEES OF THE GENUS COLLETES FROM MEXICO 



195 



Male — Similar to female, but smaller ; no black liairs on thorax. The 

 male is easily distinguished by the last joint of the antenna, which is oreatly 

 dilated and flattened. Head — Similar to female but face covered with long 

 white pubescence. Malar space about one-third as long as broad. Antennae 

 long; flagellum, black above, light brown beneath, except last joint which is 

 entirely black. The last joint is about twice as long as the others, and about 

 two-tliirds as wide as long. Joint three is shorter than four; four equal to 

 five; all beyond three twice as long as broad, except last. The vertex of 

 the b.ead is finely double-punctured. Under part of bead covered with dense, 

 long, white pubescence. 



Figure 73. CoUetes dilatata. 



Thorax — Similar to female, but more densely pubescent, no black hairs. 

 The scutellum is similar to the female, but besides being punctured the sur- 

 face is roughened by minute wavy lines. The metathorax is similar to that 

 of the female, but bowl of enclosure not so noticeably divided into pits. 



Abdomen — Same as in female, except for a little denser pubescence, and 

 slightly less dense punctufation. Underneath, the abdomen is covered with 

 more, and longer hair, than in the female ; the fascise on under part being very 

 dense and long. 



Legs — Similar to female, but hind femora not densi'ly haired; hind tibia; 

 with tuft-like fringe of very long, white, silky hair on ])osterior edge; tarsal 

 joints sparsely haired ; first joint much narrower than in female, being from 

 one-third to one-fifth as wide as long, and slightly broadi r at apex. 



Male genitalia (Fig. 72>, A) — Stipes notched, third joint short, stout, 

 thickly haired ; second joint also thickly haired, on inner side. Sagittal rods 

 long, rather stout, medially expanded ; membranous wings broad and recurved 



