Itecords of Bees. 539 



Tliis is an ordinary looking species, Imving a general 

 resemblance to the following : — 



(1) 0. faceta, Cross., from wliich it differs by the green 



abdomen, without black hair on sides of second 

 segment ; segment 6 entire, &c. 



(2) 0. i/iurbana, Cress., from which it differs by the clear 



wings, different tint of abdomen, different colour of 

 hair of thorax above, &c. 



(3) 0. iridisy C. & T., from which it differs by the 



absence of black hairs on head, the smaller, greener 

 abdomen, &c. 



(4) 0. chlorops, C. & T., from which it diflfers by the non- 



moniliform antenna3, &c. 



Among the Old World species it resembles 0. Latreillei^ 

 Spin. 



Hah. Boulder, Colorado, on the campus of the University 

 of Colorado, at flowers of Taraxacum taraxacum, in company 

 with 0. gaudiosttj April 10, 1907 {Edna Baker). 



Bomhomelecta arizonica, Ckll. 



This species was described from a single female. Professor 

 R. H. Forbes has found a male in a cell oi Anthophora Forbesij 

 Ckll., at Tucson, Arizona, April 13, 1907. 



This is the first record showing the host-relationships of 

 Bomhomelecta. The male B. arizonica is very similar to tliat 

 of B. Alfredi, but smaller (length hardly 12 mm.), with a very 

 tli.stinct black band between the wings, consisting of a densely 

 punctured area free from the white pubescence, but with a 

 moderate amount of black hair. The middle tibite are 

 densely covered with snow-white hair on the outer side ; 

 the posterior tibise and tarsi have much white hair on the 

 outer side. The fourth and fifth ventral abdominal segments 

 are covered with white hair. 



Exomalopsis soUdaginis, Ckll. 

 Mcsilla, New Mexico, June 21, ? {Cocker ell) -^ Albuquer- 

 que, New Mexico, June 30, c? , with only two submarginal 

 cells, the same on both sides {Cockerell). 



Perdita dasi/Iiril, sp. n. 

 Exceedingly close to P. luciw, Ckll., but with the meso- 

 thorax, scutellums, and upper surface of metathorax entirely 

 dark metallic green, the green being also of a bluLsh tint, not 

 yellowi.sh as in lucice. It is also close to P. Martini', Ckll., 

 but the male has a large yellow patch on the pleura, and 

 largely darkened ncrvurcs, and the yellow of the face does 



