Anthoinyid genera Hatmnouiyia and Hylephila. 307 

 Hammomyia * Rondani, Dipt. Ital. Prodr. vi, 236 (1877). 



TABLE OF SPECIES. 



1. (2) Arista plumose. Only one strong supra-alar bristle over 



root of wing (pre-alar bristle absent). . . 1. grisea Fin. 



2. (1) Arista pubescent. Two strong supra-alar bristles (pre-alar 



bristle present). 



3. (4) Male : — Grey, with at most a very faint brown median 



stripe on thorax. Female : — Frons rather narrower (com- 

 pared with width of head as 25 : 100). . 2. albescens Zett. 



4. (3) 3Iale : — Much darker and with a distinctly 3-5 striped thorax. 



Female : — Resembling albescens but frons rather wider 

 (compared with width of head as 30 : 100). 



3. sockiia Meig. 



1. H. grisea Fallen, Dipt. Suec. Muse. 57 (1823). 

 (Plate VII, fig. 1.) 

 This large greyish species is easily recognised by the 

 characters given in the Table. 



o. Ocellar and frontal bristles long and strong. Only a single 

 row of bristles along oral margins. Thorax with a distinct brownish 

 central stripe and a brown patch behind humeri and usually one 

 on centre of scutellum at base. Abdomen inconspicuously tessellated 

 and with a central brown stripe and slightly brownish hind-margins 

 to segments. Hind-marginal bristles very strong. Sternopleura 

 with a shorter finer bristle beneath both the usual strong front 

 and hind bristles. Hind femora with a complete anteroventral 

 row of bristles and a posteroventral row on apical half or more. 

 Front tibiae with a strong posteroventral bristle. No bristle 

 beneath middle tibiae. Hind tibiae with 3-4 short strong bristles 

 behind. Wings with the postical cross-vein rather sinuate and 

 somewhat oblique. 



$. Frons wide, almost \ the width of head. Orbital bristles 

 stronger than in any other species of the genus, two pointing 

 forwards and a smaller upper one pointing backwards and slightly 

 outwards. Chaetotaxy of legs as in the male but no postero- 

 ventral bristles on hind femora and the bristles of anteroventral 

 row less conspicuous. No bristles behind hind tibiae. 



Length 5-5-8 mm. 



* Stein has recently used the emended name of Ammoini/ia for 

 this genus. Even if the use of the aspirate be incorrect, the incon- 

 venience caused by the alteration of the initial letter appears to 

 warrant the retention of the name as originally written by Rondani. 



