DURHAM DIPTERA. 209 



XXXI. 



Family XXXI.— TACHINID^E. 



A large and very difficult family, in which I doubt if mere 

 tables will be of much use. The following are taken chiefly 

 from Schiner, whose arrangement and nomenclature is old, but 

 easier I think than the complicated tables of Brauer and 

 Bergenstamm. The arrangement differs considerably from 

 Verrall's, but it works out to the same thing at the finish, and 

 the numbers will indicate the proper order. 



TABLE OP GENERA. 



1 (118). Arista bare, or at most pubescent (III. 49). 



2 (7). Abdomen almost bare, or, if hairy, without strong 



bristles. 



3 (6). Abdomen with five or six segments generally flattened ; 



wings broad and long, almost triangular. 



4 (5). 0.4 2 open. 400. Phasia, Ltr. (1827. rotht, Ztt.) 



5 (4). 0.4 2 closed. Alophora, Dsv. (401) 



6 (3). Abdomen with four segments, spherical; wings com- 



paratively short and narrow. 



397. Gymnosoma, Mg. (1823. rotundatum, L.) 



7 (2). The strong bristles (macrochaetae) present on the 



abdomen. 



8 (13) (14). Abdomen long, cylindrical, bent downwards, 



narrow at the base, with five segments, the 

 first one often indistinct ; genitalia strongly 

 developed. 



9 (12). 0.4 2 closed and stalked. 



10 (11). V.4. ending in V.3. at right angles. Both the corners 



of 0.4 2 right angles. Ocyptera, Ltr. (375) 



11 (10). V.4. inclined to V.3, Upper outer corner of 0.4 2 acute. 



376. Ocypterula, Rnd. (1776. p/silla, Mg.) 



12 (9). 0.4 2 open; third antennal joint broad and triangular. 



377. Lophosia, Mg. (1777. fasctata, Mg.) 



13 (8) (14). Abdomen shortly cylindrical with five segments, 



the last segment very narrow and bent in on 

 the body. Cercomyia, Br. and Berg. (398) 



N 



