AHT. 9 FLIES OF THE FAMILY SYRPHIDAE SHANNON O 



L^ Face tuberculate in male, concave in female ; no 

 transverse row of spines on mesonotum ; male 



dlchoptic Valdivia, new genus. 



F^ Discal cross vein joining discal cell near or beyond the middle 

 {Zonemyia may be confused here but the transverse row of 

 spines noted above will serve to separate this genus). 



XYLOTINAE. 



G\ Metasternum pilose. 



H\ Hind femur with one or two apical toothlike processes 

 ventrally. 

 I\ Hind femoral process consisting of one tooth ; hind coxa 



without spur (Ortholophus Bigot) Tropidia Meigen. 



I^ Hind femoral process bidentate ; hind coxa with small spur. 

 J\ Body very elongate ; discal cross vein simple ; male 



holoptic Acrochordonodes Bigot. 



J'^ Body broad ; discal cross vein with a free-ending branch ; 



male dichoptic Stilbosoma Philippi. 



H^ Hind femur without apical process ; face subcarinate. 

 v. Wings nearly devoid of villi, glassy in appeai'ance; arista 

 shorter than width of face. 



Syritta St. Fargeau and Serville. 

 I'. Wings villose, not glassy ; arista distinctly longer than 



width of face Planes Rondani. 



G'. Metasternum pubescent or bare. 

 H\ Body dark colored. 



r. Face black, with a median longitudinal ridge and two 

 oblique ridges. 

 .T'. Abdomen strongly constricted basally. 



Tatuomyia Shannon. 



J\ Abdomen of nearly uniform width__Crepidomyia Shannon. 



I^ Face bright yellow with an obtuse longitudinal ridge; 



metathoracic spiracle distinctly larger than third 



antennal joint; hind trochanters of male spurred. 



Sterphus Philippi. 



1*. Face bluish black, gently concave in profile ; metathoracic 



spiracle much smaller than third antennal joint; hind 



trochanters simple Philippimyia Shannon. 



B.-. Body entirely reddish yellow ; very large and robust. 



Eriophora Philippi. 



The following genera have been recorded from South America, 

 but as there is no material at hand from which good characters may 

 be cliosen to key them they have not been included. 



Subfamily Syrphinae 



Paraffus Latreille : 



annulipes Macquart Brazil. 



ruftcaudatus Bigot Brazil. 



EpistroiiJie Walker : 



imitator Curran Venezuela. 



Doros Meigen : 



IDoros odyneroides Philippi Chile. 



