186 HYMENOPTERA OF AMERICA NORTH OF MEXICO 



^pallipes (Gravenhorst). Transcont. in Huds., Canad., and Transit. Zones; 

 Mexico, Europe. 

 Bassus pallipes Gravenhorst, 1829. Ichn. Europaea 3: 325. "S" = ?. 

 Syrphoctonus pallipennis (Provancher) . Transf. from Syrphoctonus 



Foerster (syn. and transf. teste Dasch, 1964, pp. 94, 99, 175). 

 *Bassus pallidipes Bignell, 1898. Trans. Devon. Assoc. 30 : 500. Emend. 



pectoralis (Provancher). Transf. from Syrphoctonus Foerster, p. 351 (teste 

 Dasch, 1964, pp. 94, 99, 121). 



pleuralis pleuralis (Cresson), changed status. East. No. Amer., centr. Tex. 

 Transf. from Syrphoctonus Foerster, p. 351 (teste Dasch, 1964, 

 pp. 92,97, 145). 

 Syrphoctonus pleuralis (Cresson), p. 351. Reduced to subsp. rank (teste 

 Dasch, 1964, p. 145). 



pleuralis syrphicola (Ashmead), changed status. Alta., B. C. south to Calif., 

 Utah, Colo. Hosts: Scaeva pyrasti (L.) ; Metasyrphys perplexus 

 (Osborn) . 

 Bassus syrphicola Ashmead. Transf. from syn. of Syrphoctonus pleuralis 

 (Cresson), p. 351, and reduced to subsp. rank (teste Dasch, 1964, 

 pp. 145, 146). 



*quadrangularis Dasch. Colo., Alta, Yukon, Alaska, B. C, Idaho, also Mass., 

 N.J. 

 Homotropus quadrangularis Dasch, 1964. Amer. Ent. Inst. Mem. 3: 91, 

 96, 106. $, 9. 



*robsonensis Dasch. B.C. (Robson). 



Homotropus robsonensis Dasch, 1964. Amer. Ent. Inst. Mem. 3: 91, 96, 

 183. $, ?. 



robustus (Davis). B. C, Mich. Transf. from Syrphoctonus Foerster, p. 351 

 (teste Dasch, 1964, pp. 91, 96, 181). 



*rufulus Dasch. Maine, Ont. to S. C. vv^est to Wis., 111.; also La. 



Homotropus rufulus Dasch, 1964. Amer. Ent. Inst. Mem. 3: 90, 96, 104. 



$, 9. 



*sicarius Dasch. Labrador, Que., N. W. T., Alaska in Huds. and Arctic 

 Zones. Host: simuliid pupa. 

 Homotropus sicarius Dasch, 1964. Amer. Ent. Inst. Mem. 3: 94, 98, 161. 



S, ?. 



'*'signatus (Gravenhorst). N. S., Que. to Md., Ohio, west to Colo., Oreg., B. C, 



Yukon, Alaska; Europe, Japan, Kuriles. Host: Sphaeroplwria 



cylindrica (Say). 

 Bassus (Bassus) signatus Gravenhorst, 1829. Ichn. Europaea 3: 325. 9. 

 Syrphoctonus compressiventris (Cresson) (syn. teste Dasch, 1964, p. 



164). 

 Zootrephes montanus Davis. Transf. from Syrphoctonus Foerster, p. 350 



(teste Dasch, 1964, pp. 95, 100, 164). 



*tarsaiorius Panzer. Que., N. W. T., Ont., Alaska, B. C, Oreg., Idaho, Alta., 

 Colo., Mich., N. Y. in Huds., Canad. Zones; Europe, Asia. 

 Bassus tarsatorius Panzer, 1809. Faunae Ins. Gennanicae Jahrg. 9, 

 H. 102, T. 19. 9. 



*teres Dasch. Colo. 



Homotropus teres Dasch, 1964. Amer. Ent. Inst. Mem. 3: 90, 95, 113. 5, 

 9. 



*venustus Dasch. Colo., Utah, Idaho. 



Homotropus venustus Dasch, 1964. Amer. Ent. Inst. Mem. 3: 89, 95, 138. 

 $, 9. 



*vitreu8 Dasch, Labrador, N. W. T., Alaska, B. C, Alta., Wash., Oreg., 

 Calif., Wyo., Mich. 

 Homotropus vitreus Dasch, 1964. Amer. Ent. Inst. Mem. 3: 94, 100, 173. 

 $, 9. 



