236 NORTH AMERICAN ANTHOMYIID FLIES OF GENUS PHAONIA 



BIGOTOMYIA Malloch 



Generic characters.- — Differs from Phaonia in having the fourth 

 vein distinctly bent forward at apex, and the third with some 

 setulose hairs at base. 



Genotype, Bigotomyia trispila (Bigot). 



Key to Species 



1. Basal abdominal sternite with some setulose hairs: abdomen with a dorsal 



vitta and lateral checkerings black calif orensis new species 



— Basal abdominal sternite bare; abdomen with only a blackish dorsocentral 



vitta, without lateral checkerings 2 



2. Humeri black; eyes of male separated by width across posterior ocelli. 



houghi Stein 



— Humeri yellowish testaceous; eyes of male separated by much less than 



width across posterior ocelli houghi Stein variety 



Bigotomyia houghi (Stein) 



Aricia houghi Stein, Berl. Ent. Zeitschr., 1897, p. 177. 



Differs from ccdiforniensis in having the legs entirely yellow. 



Structurally similar to that species. Differs in having the hypopleura 

 usually with a few hairs below spiracle and some on margin of spiracle at 

 center; four or five antero ventral bristles on hind tibia; and the fourth wing- 

 vein less noticeably curved forward at apex. 



Length, 8 to 9 mm. 



One of the commonest species of the genus, occurring in 

 Canada, from Washington to Maine and as far south as middle 

 California and Florida. 



Bigotomyia californiensis new species 



Male. — Black, very distinctly gray pruinescent. Second antennal joint, 

 base of third, and the palpi ferruginous. Scutellum rufous, more or less 

 blackened at base. Legs reddish yellow, coxae, almost all of fore femora, 

 bases of mid and hind femora, and the entire tarsi black. Calyptrae whitish 

 yellow. Halteres yellow. 



Eyes long haired, separated at narrowest part of frons by less than width 

 across posterior ocelli; longest hairs of arista much longer than width of third 

 antennal joint; parafacial in profile a little broader than third antennal joint 

 and about one-third as wide as height of cheek, the latter with numerous 

 bristles which occupy a large portion of its surface, almost all of it posteriori}'; 

 bristles ascending facial ridge much above the vibrissa. Presutural acro- 

 stichal bristles absent; j)ostsutural dor-so-centrals 4; prealar bristle long; 

 sternopleurals 1 : 2. Abdomen broadly ovate. Fore tibia without median 

 bristle; mid femur with five or six strong bristles on ba.sal half of postero- 

 ventral surface; mid til)ia with two or three posterior bristles; hind femur 



