340 



slender horizontal stripes on center, and Neopachygaster niaculicornis 

 has the upper half of eye, except the narrow posterior margin, purple, 

 the remainder being yellowish. 



Zabrachia Coquillett 



There is only one species of this genus recorded for North 

 .America. 



GENERIC CHARACTERS 



Larva and Pupariiim. — Similar in general appearance to that of 

 Bupachygaster henshaivi, differing as stated in key to genera. 



Zabrachia pout a Coquillett 



Zahrachia polita, Coquillett, Bull. 47, N. Y. State Mns., p. 585. (1901) 



Larva and Pupariiim. — Length, 3.5-4.5 mm. Dark reddish brown. 



Head as in Bupachygaster, the bristles longer than in Neopachy- 

 gaster. Arrangement of bristles on body as in the other genera of 

 the Pachygasterinae, but their relative lengths different. The large 

 lateral abdominal bristle in Zahrachia is not nearly as long as 

 width of abdomen, while in Bupachygaster it is quite as long as the 

 segment which bears it. The other distinctions are indicated in the 

 key to genera. 



I have ascertained the above facts from an examination of a speci- 

 men spent me by C. W. Johnson, from Massachusetts. 



Subfamily XYLOMYIINAE* 



Williston places the genus Xylomyia in his subfamily Arthro- 

 ceratinae, along with the genera Glutops and Arthrocera. His note 

 on page 387 of his Manual would appear to indicate that he considered 

 Misgomyia as belonging to the same subfamily. None of the three 

 genera which he includes with Xylomyia are known to me. If they 

 belong to the same subfamily as Xylomyia the name of the subfamily 

 should be Xylomyiinae, unless one accepts Solva Walker as a prior 

 name for the genus Xylomyia. 



Xylomyia Rondani 



I have seen the larva of but one species of this genus. It agrees 

 generally with that of Xylomyia macidata Meigen as figured by 



*I have retained the name Xylomyia here though the evidence that Solva Walker 

 has priority is very strong. 



