90 DURHAM DIPTERA. 



XV. 



Section II.— BRACHYCERA. 

 Family XV.— STRATIOMYID^E. 



TABLE OE GENERA. 



1 (22). Abdomen with five, or at most six distinct segments 



Scutellum without thorny processes, or at most 

 with only two such. 



2 (5). V.4. breaking up into only three branches. Third 



antennal joint round (III. i). 

 8 (4). Eyes touching in the male. Posterior orbits produced 

 into a prominent ridge in both sexes. 



Pachygaster, Mg. (140) 



4 (3). Eyes separate in both sexes. Posterior orbits not 



produced into a ridge in either sex. (See Mr. 

 Austen's note, E.M.M., 1901, p. 241). 



140^. Neopachygaster, Aust. 

 (850. orbitalis, Whllg.) (meromelcena, Dup.) 



5 (2). V.4. breaking up into four branches (V. 1). Third 



antennal joint longer than broad (III. 2-5). 



6 (16). Non-metallic species, mostly black or dark brown, 



with light spots or bands, sometimes with yellow 

 abdomen. 



7 (8). Dorsum with a strong thorn-like process on each 



side. 141. Ephippium, Ltr. (851. thoracicum, Ltr.) 



8 (7). Dorsum without any such process. 



9 (10). Scutellum without any thorn-like process. 



Nemotelus, Geoff. (142) 



10 (9). Scutellum with two thorns. 



11 (14). First antennal joint about as long, or at most twice 



as long as the second (III. 2). 



12 (13). Style of the antenna? long and thin (III. 2). 



Oxycera, Mg. (143) 



13 (12). Style of the antennas short. Odontomyia, Mg. (145) 



14 (11). First antennal joint always more than twice as long, 



often three or four times as long as the second 

 (III. 3). Stratiomys, Geoff. (144) 



15 (6). Metallic blue-green or violet species, without pale spots. 



