104 PROCEEDINGS OF THE NATIONAL MUSEUM vol.93 



This genus containing two Nearctic species is closely related to 

 Phryxe (s. s.) . The European authorities have difficulty in separating 

 Thelymyia from Exorista of authors. A combination of characters, 

 such as apical scutellars turned backward, palpi yellow, three post- 

 sutural dorsocentral macrochaetae, and male with two proclinate 

 fronto-orbital bristles, serves to separate Thelymyia from Phryxe. 

 Townsend recognizes the close relationship of Phryxe and Thelymyia 

 by placing them both in the tribe Lydellini. 



KEY TO THE SPECIES OF THELYMYIA 



1. Frontal orbit silvery gray, not noticeably black toward vertex ; facial ridge 

 bristly on lowest one-fourth or one-third; palpus yellow; thorax and 

 scutellum gray-pollinose, with four black mesonotal vittae, scutellum 

 black with extreme tip usually faintly yellow; sternopleural macrochaetae 

 three ; midtibia with two median anterolateral bristles ; gray pollen of the 

 abdomen fairly heavy and well defined; apical one-fourth to one-third of 

 segments 2 and 3 and apical half of segment 4 sharply demarked and shining 

 black; narrow dorsal abdominal vitta black and well defined; dorsal ab- 

 dominal hairs in male depressed; bristles on fourth segment approaching 



macrochaetae in size in male only 1. curriei (Coquillett) (p. 104) 



Frontal orbit silvery gray but more blackish, becoming black toward vertex ; 

 gena dark blackish gray, subshining; facial ridge usually bristly half 

 way; palpus yellow, slightly infuscated at base; thorax and scutellum cov- 

 ered with such a thin layer of pollen as to appear shining black; mesono- 

 tal stripes hardly distinguishable; sternopleural macrochaetae three or 

 more (very variable); scutellum black; midtibia with three or four 

 median anterolateral bristles; gray pollen of abdomen so thin and ill- 

 defined as to appear shining black, pollen slightly more noticeable at 

 base and sides of segments ; dorsal abdominal vitta hardly distinguishable ; 

 fourth segment of female polished black; dorsal abdominal hairs in male 

 erect; macrochaetae on fourth segment, those of male the same size as on 

 third segment, those of female almost same size as third. 



2. erecta, new species (p. 105) 



t. THELYMYIA CURRIEI (Coquillett), new combination 



Exorista curriei Coquillett, U. S. Dept. Agr., Div. Ent., Tech. Bull. 7, p. 94, 



1897. 

 Zenillia curriei (Coquillett) Aldrich and Webber, Proc. U. S. Nat. Mus., vol. 



63, art. 17, pp. 33-34, 1924. 



This species closely resembles the genotype, saltuum (Meigen). 

 Head with front of male at narrowest 0.35 to 0.39 and front of 

 female 0.35 to 0.38 of head width; frontalia one-third width of 

 front; frontal row of five to eight bristles plus two reclinate upper 

 frontals, extending down to base of third antennal segment, two 

 proclinate fronto-orbital bristles; male with small and female with 

 outer vertical bristle; gena about one-seventh eye height; antenna 

 black, length of third segment in male four to four and one-half and 



