AET. a FLIES OF THE GENUS STYLOGASTEE ALDRIGH 27 



tip above. Mesonotum black, strongly shining, with depressed black 

 hair; pleura with usual dark stripe. Metanotum opaque black in 

 middle. Abdomen shining; first segment reddish brown above, its 

 lateral bristles entirely white ; second, third, and basal half of fourth 

 segments wholly reddish yellow ; remainder black except basal third 

 of fifth. First long joint of ovipositor shining black, its base and 

 the short basal joint reddish yellow with white pruinosity; terminal 

 joint opaque black, white at base. Front and middle legs pale 

 yellow; hind femora biannulate; hind tibiae blackish brown, before 

 the tip with a whitish ring which bears yellowish- white hair. Wings 

 grayish. 



Length, 10.5 mm. 



One female, Mapiri Sarampioni, Bolivia. Type in Dresden 

 Museum. 



I have not seen this species, but have given the more important 

 characters from Krober's description. The pale abdomen seems very 

 unusual, and will probably suffice to distinguish the species. 



STYLOGASTER BIANNULATA var. ARGENTINA Krbber 



Stylogaster iiannulata var. argcntina Krober, Kouowia, vol. 8, 1929, p. 174. 



Front above and vertex deep velvet black; pleura with broad, 

 brown diagonal stripe; halteres wholly yellow. First abdominal 

 segment black, somewhat yellowish only at the sides ; second to fifth 

 segments pale yellowish brown with black posterior crossband, 

 which is drawn out forward in the middle, reaching anterior mar- 

 gin on second and fifth; sixth clear reddish yellow with two black 

 spots on hind edge; seventh entirely yellow. Lateral bristles of 

 second segment unusually long, black. Middle and hind coxae with 

 white hair. 



Length, 8 mm. 



One male from Tapikiole, Northern Argentina. 



(Translation of Krober.) 



I make this out to be a specimen of stylata with the abdomen 

 slightly lighter in color than the ones I describe. Only an exami- 

 nation of the type to determine the other characters I am using will 

 settle its status. 



U. S. GOVERNMENT PRINTING OFFICE: 13JI 



