38 



Mr. T. D. A. Cockerell on 



Triepeolus donatus (Smith). 



A female in the National Museum, from San Bernardino 

 County, California, October (Coquilletl), is referred here, as 

 it agrees in every particular with the descriptions of donatus 

 by Smith and Cresson, except that the pubescence of the 

 abdomen is identical in colour with that of T. concoJor. It is 

 to be remarked that T. superbus (Provancher) has nearly the 

 same characters ; but its pubescence is pale yellow and the 

 markings of the abdomen appear to be different. 



Triepeolus isocomce, sp. n. 



The male was taken at Albuquerque, New Mexico, Sept. 16, 

 at flowers of Isocoma Wrigktii, and was recorded in Bull. 

 Denison Lab. xi. p. 73, as Epeolus occidentalis. It is 

 certainly a distinct species, differing from occidentalis as 

 follows :■ — 



T. isocomce $ . 



Smaller, about 9 millim. long ; 

 abdomen less tapering. 



Markings pale cinereous. 



Labrum with a little apical pit 

 full of white pubescence, its sides 

 projecting and subdentiform. 



Labrum all black. 



Stripes on mesothorax hardly 

 separated, i. e. the area between 

 them pubescent. 



Scutellum strongly bilobed. 



Lower part of pleura covered 

 with hair. 



Wings shorter, hyaline ; venation 

 more ferruginous, marginal cell 

 more obtuse. 



Hair on inner side of basal joint 

 of hind tarsi black. 



Second abdominal segment with 

 large pyriform lateral hair-patches, 

 pointed* antero-mesad. 



T. occidentalis J (from Colorado). 



Larger, about 11 millim. long; 

 abdomen more tapering. 



Markings cream-colour. 



Labrum with two minute apical 

 projections, but no pit. 



Labrum with a red spot on each 

 side. 



Stripes on mesothorax well se- 

 parated. 



Scutellum feebly bilobed. 



Lower part of pleura nude,except 

 on anterior margin. 



Wings longer, brownish ; vena- 

 tion more fuscous, marginal cell 

 more acute. 



Hair on inner side of basal joint 

 of hind tarsi orange-ferruginous. 



Second abdominal segment with 

 rather small lateral patches anterior 

 to the band. 



The mandibles of T. isocomm are perfectly simple, red in 

 the middle ; the antennae are black, the flagellar joints with 

 obscure reddish spots; the hind coxae are mainly red; all the 

 trochanters, femora, tibiee, and tarsi are red ; the scutellar 

 teeth are short and black ; the hind tibial spurs are black. 

 Eyes (at least when dry) light green. 



T. segregates {Epeolus occidentalis, var. segregatus) appears 



