Stratiomyiidae. 19 



1. Eyes bare, separated in both sexes, but mostly so in 

 the female; eye-facets in the male of equal size; ab- 



domen very elongated 7. Sargus. 



— Eyes touching in the male, widely separated in the 

 female ; eye-facets in the male of unequal size ; abdomen 

 moderately elongated 2. 



2. Eyes densely hairy 8. Microchrysa. 



— Eyes bare or nearly bare 9. Chloromyia. 



5. Beridinae. 

 Scutelluin with six bristle-bearing spines (aberrantly four to eight); 

 abdomen consisting of seven segments. From the discai cell rise three 

 veins, the third is the anterior branch of the postical vein and closes 

 the discai cell below, there is thus no cross-vein between the discai 

 cell and the postical vein; four posterior cells. Alula small; squamula 

 alaris distiact, haired at the margin, squamula thoracalis wanting. Wing 

 niembrane not transversely corrugated. 



Only one genus 10. Berts. 



1. Pachy gaster Meig. 

 Species of small size and of black colour. Head somewhat globular, 

 as broad as thorax. Antennæ inserted near the lower side of the 

 head, thus epistoma and cheeks are short; yowls not descending below 

 the eyes, but on the contrary together with cheeks and epistoma 

 bending a little upwards towards the mouth-edge, so that the head 

 is somewhat hoUowed beneath. Antennæ short, eight-jointed in all, 

 the two basal joints very short, the four next forniing a globular, 

 somewhat compressed, annulated part, the two last joints forming an 

 apical arista, the first joint of which is short and difficult to see. 

 Eyes bare, touching in the male, separated in the female; in the 

 male the upper facets are larger than the lower. The oral cone is 

 small, and the proboscis itself is short, with relatively small labella, 

 labrum and hypopharynx are short, maxillæ are present, but short, 

 somewhat lancet-like with a small one-jointed palpus. Thorax is some- 

 what longer than broad, scutelluni rather large, without spines. 

 Abdomen short and broad, broader than thorax, consisting of five 

 segments. Wings with the cubital vein forked, or, in one species, 

 P. minutissima, not forked ; the anterior branch of the postical vein 

 forms the lower side of the discai cell, from this cell rise three veins, 

 of which the third is the anterior branch of the postical vein, there 

 are thus four posterior cells, the third and the fourth being confluent. 

 In rest the wings are lying parallel over the abdomen, the one covering 

 tiie other. 



