DURHAM DIPTERA. 9 1 



XV. 



16 (19). Eyes of the male not touching. Arista placed a little 



before the end of the third antennal joint (III. 4). 

 Abdomen very long. 



17 (18). The ocelli equidistant, forming a small equilateral 



triangle. Chrysonotus, Lw. (146) 



18 (17). The ocelli unequally distant, forming an isoceles 



triangle. Sargus, F. (147) 



19 (16). Eyes of the male touching. Arista placed exactly at 



the point. Abdomen moderately long. 



20 (21). Eyes distinctly hairy. 



148. Chloromyia, Dune. (887. formosa, Scop.) 



21 (20). Eyes bare or almost bare. Microchrysa, Lw. (149) 



22 (1). Abdomen with at least seven distinct segments. 



Scutellum generally with four to six thorns. 



23 (24). V.4. breaking up into only three branches. Palpi 



small and inconspicuous. Beris, Ltr. (150) 



24 (23). V.4. breaking up into four branches, of which the 



third is often rudimentary. Palpi three-jointed, 

 conspicuous. 



151. Chorisops, Rnd. (897. tibialis, Mg.) 



140. Pachygaster, Mg. 

 Larvae live in decaying vegetable matter. 



1 (4). Wings brown at the base. 



2 (8). Legs yellow with black femora. Halteres yellow with 



black knobs. (847. atra, Pz.) 



3 (2). Legs black, with the fore tibiae, the tip of the hind 



tibiae, and all the tarsi yellow. Halteres all black. 



(849. tarsalis, Ztt.) 



4 (1). Wings all clear. Legs entirely yellow. 



(848. leachii, Curt.) 



142. Nemotelus, Geoff. 



Life history unknown. 



1 (5) (10). Upper side of the abdomen chiefly whitish-yellow 

 with black spots or bands. 



