716 Hymenoptera in America North of Mexico 



alaskensis (Ashmead). Que., s. Maine, s.e. Yukon, Alaska. Males are unknown. 



Homotropus alaskensis Ashmead, 1902. Wash. Acad. Sci., Proc. 4: 226. 9. 

 albopictus (Davis). Northern Que. w. to n. Yukon and Alaska, s. to n. Va., w. N. C, Minn., n. N. 

 Mex., and n. Calif. The two "subspecies" recognized by Dasch (1964) had broadly 

 overlapping ranges. 



Homotropus bicapillaris var. albopictus Davis, 1895. Amer. Ent. Soc, Trans. 22: 28. 9. 



Homotropus albopictus ithacae Dasch, 1964. Amer. Ent. Inst., Mem. 3: 103. c5, 9. N. syn. 

 aquilonius (Dasch), n. comb. Greenland. 



Homotropus aquilonius Dasch, 1964. Amer. Ent. Inst., Mem. 3: 135. 9. 

 arizonensis (Dasch), n. comb. Northern Colo., Ariz., e. Calif. Ecology: Occurs at higher 

 altitudes. 



Homotropus arizonensis Dasch, 1964. Amer. Ent. Inst., Mem. 3: 114. S, 9. 

 badius (Dasch), n. comb. Central Calif. 



Homotropus badius Dasch, 1964. Amer. Ent. Inst., Mem. 3: 170. 6, 9. 

 belangerii (Provancher). Que. s. to Md. and. w. N. C, w. to Wis. and n. 111. Host: Syrphid. 



Bassus Belangerii Provancher, 1874. Nat. Canad. 6 (1): 31 (key); 6 (2): 56. 9. 



columbiensis (Dasch), n. comb. Southwestern Alta. and B. C. s. to Colo., Utah, and n. Calif. 

 Host: Syrphid. 

 Homotropus cohimbieyisis Dasch, 1964. Amer. Ent. Inst., Mem. 3: 123. 6,9. 

 compactus (Dasch), n. comb. Northwestern Mich., Colo., w. N. W. T., w. Wash., s.w. Oreg. 



Homotropus compactus Dasch, 1964. Amer. Ent. Inst., Mem. 3: 119. i, 9. 

 confertus (Dasch), n. comb. Que., n. N. Mex., w. B. C. 



Homotropus confertus Dasch, 1964. Amer. Ent. Inst., Mem. 3: 142. 6,9. 

 costalis (Provancher), n. comb. Que. This name is transferred from synonymy with Promethes 

 sidcator (Gravenhorst) because there appear to be no valid grounds for rejecting the 

 lectotype of Gahan and Rohwer (1917) as Townes (1939) and Barron (1975) have done. 

 Because Provancher stated that he had two specimens, lack of agreement with the 

 original description alone is not proof that the Gahan and Rohwer lectotype was not an 

 original syntype. 

 Bassus costalis Provancher, 1874. Nat. Canad. 6 (1): 31 (key); 6 (2): 58. 9. 



Taxonomy: Gahan and Rohwer, 1917. Canad. Ent. 49: 332. —Townes, 1939. Canad. Ent. 71: 



93. —Barron, 1975. Nat. Canad. 102: 455. 

 cressonii Davis. Nev. Known only from the holotype. 



Syrphoctonus cressonii Davis, 1895. Amer. Ent. Soc, Trans. 22: 27. 9. 

 cultiformis (Davis). Colo., Alaska. 



Otoblastus cultiformis Davis, 1897. Amer. Ent. Soc, Trans. 24: 273. 9. 



Otoblastus cultriformisV.) Dalla Torre, 1901. Cat. Hym., v. 3, p. 311. 



Homotropus cultriformis Dasch, 1964. Amer. Ent. Inst., Mem. 3: 179. Unjustified emend. 

 decoratus (Cresson). Colo., n. Utah, s.e. Ariz., s. B. C, Wash., Oreg., Calif.; n.w. Mexico. Host: 

 Syrphid spp. 



Bassus decoratus Cresson, 1879 (1878). Acad. Nat. Sci. Phila., Proc. 30: 375. 6. 



elegans (Gravenhorst). Que., e. N. W. T., Ont.; Europe. 



Bassus elegans Gravenhorst, 1829. Ichn. Europaea, v. 3, p. 313. 6. 

 Bassus rufonotatus Holmgren, 1858 (1856). Svenska Vetensk.-Akad. Handl. (n. f.) 1: 369. 

 6, 9. 

 fossatus (Dasch), n. comb. Newfoundland (Labrador) w. to n. Yukon and Alaska, s. to Mass., n. 

 Mich., n. Colo., and n.w. Oreg. The ranges of the two "subspecies" described by Dasch 

 (1964) were largely overlapping. 

 Ho7notropus fossatus fossatus Dasch, 1964. Amer. Ent. Inst., Mem. 3: 159. 6, 9. 

 Homotropus fossatus aureopecttis Dasch, 1964. Amer. Ent. Inst., Mem. 3: 160. 6, 9. N. 

 syn. 

 fraudulentus fraudulentus (Dasch), n. comb. Colo., s. Alta., n. Idaho, interior Alaska, s. Yukon, 

 s. B. C. 

 Homotropus fraudulentus fraudulentus Dasch, 1964. Amer. Ent. Inst., Mem. 3: 151. 6, 9. 



