BEES OF THE GENUS COLLETES FROM MEXICO 



195 



Male — Similar to female, but smaller; no Ijlack hairs on thorax. The 

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

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

 white pubescence. IMalar space about one-third as long as broad. Antenna 

 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-thirds 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 head is finely double-punctured. Under part of head 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 puncturation. Underneath, the abdomen is covered with 

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

 dense and long. 



Legs — Similar to female, but hind femora not densely haired ; hind tibire 

 with tuft-like fringe of very long, wdiite, silky hair on posterior edge; tarsal 

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

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



Male genitalia (Fig. 73, 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 



