ART. 9 AMERICAN XYLOTINE SYEPHID-FLIES SHANNON 25 



than broad; arista scarcely longer than length of antenna; third 

 joint and arista dark brown; face black, lightly dusted in front, 

 well produced downwards, broader between lower eye margin and 

 oral margin than length of arista; thorax aeneous, with a pair of 

 inconspicuous subopaque dorsal vittae and a pair of sublateral vittae 

 which are distinctly broader; legs black, the knees dark brown; 

 abdomen shining dark aeneous, the second and third tergites with 

 opaque black posterior bands which have a median forward exten- 

 sion ; wing veins extensively clouded. Length 8.5 mm., wing 7.5 "mm. 



Distinguished from 'parvus by its darker color and wing clouding. 



Type locality. — Pullman, Washington, April, 1924 (V. Argo). 



Type.— Cat. No. 27316, U.S.N.M. 



Genus BRACHYPALPUS Macquart 



Genotype. — Brctchy palpus valgus (Panzer). 



Metasternum faintly pubescent; head distinctly triangular; meta- 

 thoracic spiracle distinctly smaller than third antennal joint; arista 

 much shorter than width of face at middle; hind femur swollen in 

 both sexes, and with a very obtuse and apical protuberance on inner, 

 ventral surface ; hind trochanters of male spurred ; hind tibia, except 

 in female oarus., with subbasal projection; frontal triangle of "male 

 covered with silvery pollen; front of female broad, about twice as 

 broad as in genus Xylota; abdomen black, opaque markings very 

 weak. 



With the exclusion of all the American species, with the exception 

 of B. oarus {frontosus) which have been hitherto placed in this 

 genus, Brachypalpus remains a well-characterized genus. 



BRACHYPALPUS OARUS (Walker) 



Xylota oarus Walkeb, List 3, 1849, p. 558. 



BracliypaJpus froiitosin^ Loew. (In Museum of Comparative Zoology). 



This, our only species in Brachypalpus, agrees remarkably well 

 with the genotype valgus (Panzer), in possessing a number of well- 

 defined generic characteristics noted above. It is a fairly common 

 early spring species. Larvae live in decaying trees and logs. Larva 

 and pupa have been described by Malloch.^ Eastern North America. 



Type. — In British Museum. 



AMERICAN SPECIES HEREIN TRANSFERRED FROM BRACHYPALPDS TO OTHER GENERA 



B7-acJiy palpus apicaudus Curran= Xylotodes inarmatus apicaudus (Curran). 

 Brachypalpus inarmatus 'iluntev=Xylotodes inarmatus (Hunter). 

 BracliypaJpus metallifera {Bigot) =Xylot odes metallifera (Bigot). 

 Brachypalpus parvus WiUiston=Xylotodes parvus (Williston). 

 Brachypalpus pigra 'LoYett=Xylotodes pigra (Lovett). 



Milesia amithaon Wa\ker=^?Brachypalpus (Osten Sacken ) = ?(7noproro ( Willis- 

 ton ).=^Crtoprora amithaon (Walker). 



KBull. 111. St. Lab., p. 343, 1915. 

 3042—26 4 



