1'ACHYGASTER. J5ABIIACHIA. 21 



There is only one Indian species in the restricted genus Pacliy- 

 g aster, namely, P. annulipes, =p. nov. Macquart's P. rujitarsis* 

 from Pondicliery, cannot belong to this subfamily, as, according to 

 the plate, ifc possesses three endings to the 4th longitudinal vein, 

 apart from the upper branch of the 5th vein. 



1. Pachygaster annulipes, sp. nov. 



2 . Head : irons between one-third and one-fourth of the head, 

 shining black ; face, which is conspicuously invaginated, with 

 greyish dust ; back of head shining black. Antennae with 1st joint 

 black, the remainder wholly bright yellow, with long arista. 

 Proboscis dark. Thorax and scutellum shining black, dorsum of 

 both with very short yellowish pubescence, which does not quite 

 extend to the anterior margin of the former. Abdomen shining 

 black, witli sparse short pale yellowish pubescence ; venter black, 

 with sparser but slightly longer pubescence. Legs yellowish to 

 tips of tarsi ; a rather broad subapical black or blackish brown 

 ring on all the femora. Winr/s pale yellowish grey ; stigma 

 darker yellow ; halteres yellowish. 



Length^ 2^ mm. 



Described from a single $ from Margherita, Assam. 



Type in the Indian Museum. 



Genus ZABRACHIA, Coq. 

 Zabrachia, Coctuillett, Bull. X. Y. State Mus. xlvii, p. 585 (1901). 



G-EXOTYPE, Zobraclda polita, Coq. (North America). 



Differing from Pachyc/aster in the unforked 3rd vein. Some 

 degree of latitude must be allowed in my revised A r iew of this 

 genus, in which the species are chiefly united by the above 

 primary character. Eyes in d contiguous (minutissima, Zett., a 

 European species) or narrowly separated (annulifetnur , albipes). 

 Scutellum not upturned (minutissima), barely upturned and 

 thickened (albipes), or produced upwards into a short blunt cone 

 {(tnwulifemur). Third antennal joint transversely elliptical (jpoliUt\ 

 the type-species from New York) or as in. Pad tyy aster. 



Range. India, North America. 



Z. albipes has wholly pale yellow legs, while Z. annidifemur has 

 a broad dark band on all the femora. 



2. Zabrachia albipes, Brun. (PI. I, figs. 1, 2.) 



PacJiyyaster albipes, Erimetti, Ilec. Ind. Mus. i, p. 102, $ (1907). 

 Pactitjyaster infurcata, de Meijere, Tijd. v. Ent. 1, p. 232, 5 (1907). 



$ . Head and front shining black, with a brilliant white streak 

 on each side of lower part of head ; antennas and proboscis orunge- 



* Dipt. Exot. Supp. i, p. 57, pi. vi, fig. 3 (1846). 



