50 PROCEEDINGS OF THE NATIONAL MUSEUM vol.69 



jowls and the shining black abdominal venter clothed with black 

 pile. The apex of the wing is infuscated. Length, about 20 mm.; 

 wing, 17 mm. One female, Chile, in the British Museum. 



SPECIES OF XYLOTINI FEOM SOUTH AMERICA NOT SEEiN BY WKITEE 



The generic position of some of these species may be erroneous. 



Tropid'm flaminanna Philippi (Chile). 



Tropidia rubrlcornis Philippi (Chile). 



Xylota aurifac'les Bigot (Chile). 



Xylota chloropyga Schiner (Colombia). 



Xylota coarctata Wiedemann =r«^iic»w22/M. coarctata (Wiede- 

 mann). 



Xylota geividna Williston=^C7'epido77iyia}^ 



GeHogaster fuscithorax Williston. A genus apparently closely 

 allied to Tatuomyia. Differs in having the face gently convex in 

 profile; abdomen broadest on the fourth segment; discal cross vein 

 joining discal cell shortly before the middle. 



Williston described another species at a later date in the Biologia 

 Centralia Americana calling it GeHogaster auricanidata. This 

 species, the type examined by the writer, apparentl}^ belongs to the 

 Temnostomini and it is doubtful if it is actually congeneric with 

 the genotype of Geriogaster. 



The type specimen of Xylota ventralis Walker, described from 

 the Aru Islands, Malay Archipelago, apj)arently belongs to the 

 genus Crepidomyia. 



