ART. 9 AMERICAN XYLOTINE SYRPHID-FLIES SHANNON 39 



margins of tergites 2 and 3 opaque black; metathoracic spiracle as 

 large as third antennal joint. The constricted abdomen which Wil- 

 liston noted for the male of this species is an abnormality due to 

 shrinkage in drying. Male with a well developed spur. 



Type locality. — Omilteme in Querrero, 8,000 feet, Mexico (H. H. 

 Smith). 



Type. — In British Museum. 



XYLOTA BRACHYGASTER Williston 



Tergites 2 and 3 each with a pair of small yellow spots; anterior 

 border of wing brown, hyaline behind; metathoracic spiracle large; 

 spur on male trochanter barely suggested. 



Type locality. — Omilteme in Querrero, 8,000 :^et, Mexico (H. H. 

 Smith). 



Type. — In British Museum. 



LIST SHOWING SYNONOMY AND CHANGES MADE IN GENERIC ASSIGNMENT OF SPECIES 

 DESCRIBED UNDER XYLOTA 



(Subsequent to the Kertesz Catalogue) 



arquata Say = Syrphus arquata (Say). 



pacliymera Loew = Planes pachyynera (Loew). 



pauxilla Williston = Planes pauxilla (Williston). 



pretiosa Loew = Planes pretiosa (Loew). 



vagans Wiedemann = Planes vagans (Wiedemann). 



anthreas Walker = Xylotomima anthreas (Walker). 



Mton Walker = Xylotomima baton (Walker). 



chalybea Wiedemann = Xylotomima chalybea (Wiedemann). 



curmpes Loew = Xylotomima curvipes (Loew). 



dascow Walker = Xylotomima nemorium (Fabricius)? 



fascialis Coquillett = Xylotomima anthreas (Walker). 



fraudulosa Loew = Xylotomima baton (Walker). 



Ubo Walker = Xylotomima libo (Walker). 



marginalis Williston = Xylotomima libo (Walker). 

 nemorum (Fabricius) = Xylotomima nemorum (Fabricius). 

 metallica Wiedemann = Xylotomima metallica (Wiedemann). 



plesia Currau = Xylotomima plesia (Curran). 



pigra (Fabricius) = Xylotomima. pigra (Fabricius). 



pwrpwrea Walker = Xylotomima chalybea (Wiedemann). 



rubiginigaster Bigot = Xylotomima vecors (Osten Sacken). 



subtropica Currau = Xylotomima metallica (Wiedemann). 



vecors Osten Sacken = Xylotomima vecors (Osten Sacken). 



bmittata Bigot = Tropidia bivittata (Bigot). 



coloradensis Bigot = Tropidia coloradensis (Bigot). 



metallifera Bigot = Xylotodes nietallifera (Bigot). 



oarus Walker = Brachypalpus oarus (Walker). 



aepalims Walker = Calliprobola aepalius (Walker). 

 coarctata Wiedemann = Tatnomyia coarctata (Wiedemann). 



plagiata \Yiedemann = Crepidotnyia plagiata (Wiedemann). 



ventralis Walker = Crepidomyia ventralis (Walker). 



subcostaUs Walker = Quichuana siibocstalis (Walker). 



