ANTHOPHORID BEES FROM COLORADO. 59 



Males. 



Basal joint of hind tarsus toothed .... 1. 



Basal joint of hind tarsus not toothed ... 2. 



1. Basal joint with a large tooth ; pubescence often 



red . . . . A. homboides subsp. ncomexkana, Ckll. 



Basal joint with a small tooth; pubescence never 



red . ..... Anthophora gohrmance, Ckll. 



2. Middle tarsus with copious red hair; face-marks 



light-yellow, a heavy black band on each 



side of clypeus A. euops, Ckll. 



Middle tarsus without red hair ... 3. 



3. Abdomen fasciate ; thoracic pubescence often 



red ; face-marks light yellow . . /4. ?How(flwa, Cresson. 

 Abdomen not fasciate ; thoracic pubescence 



never red ....... 4. ^ 



4. Face-marks white . . Emphoropsis vnicida \&v.johnsoni, n. v. 

 Larger ; face-marks light yellow . Anthophora porteroi, Ckll. 



(1.) Emphoropsis mucida (Cresson) y2^x. johnsoni, n. var. 



? (type ; Fort Collins district, 1903) differs from E, mucida 

 by having a patch of black hair in middle of dorsum ; hair on 

 outer side of hind tibiae shining reddish-orange, conspicuously 

 plumose ; first recurrent nervure joining second submarginal cell 

 a little distance from its end (meeting second transverso-cubital 

 in mucida); hair of middle of fifth abdominal segment light 

 brown, at sides white. 



(?. Pubescence of hind legs black on femora, white on 

 outer side of tibiae and tarsi; abdomen with the first two 

 segments with yellowish-white hair, segments beyond with 

 black, except extreme sides and the apical segment. 



The type was taken by Mr. S. A. Johnson in the foothills 

 near Horsetooth Mountain, flying over a patch of larkspur. 

 The bees were very shy, swift flyers, Mr. Johnson reports. 

 The actual label on the specimen gives the date, May 12, 1903, 

 and the locality ''Fort Collins." I presume, therefore, that 

 other such labels are to be understood to refer to the region 

 about Fort Collins, but not necessarily to the place itself. 

 This is important, because the foothills fauna certainty 

 differs in many respects from that of the town. Other speci- 

 mens, males, are from Fort Collins, May 10, 1901, and Lamar, 

 Colorado, collected by Prof. C. P. Gillette. 



This may be a valid species. I have not seen typical 

 mucida, but Mr. Viereck kindly examined for me Cressou's type, 

 and reports that it has no black hairs on the thoracic dorsum ; 

 and the hair on outer side of hind tibiae is whitish straw- 

 coloured, and not at all conspicuously plumose. From Cresson's 

 descriptions, I inferred that mucida (female) and morrisoni (male) 

 were the sexes of one species, and Mr. Viereck, after comparing 

 the types, is of the same opinion. 



