234 DURHAM DIPTERA. 



XXXI. 415. 



415. Onesia, Dsv. 



Ovo-viviparous. Larvae in putrifying flesh. 



1 (2). Palpi yellow, or at most only brownish in places. 



1857. Onesia sepulchralis, L. 

 Hesleden, 5 $ and 6 ¥, Wearhead, 1 $, Bishop 

 Auckland, 1 $, May-August, 1 899-1 901. 



2 (1). Palpi wholly and intensely black. 



1858. Onesia cognata, Mg. 

 Hesleden, 2 $ and 1 ?, August, 1900. 



416. Sarcophaga, Mg. 



Ovo-viviparous. Larvae in putrifying flesh and dead animal 

 matter. Grey checkered flies very much alike in general 

 appearance. It is almost impossible to identify females by 

 themselves. 



1 (30). Apex of the abdomen black or grey in both sexes. 



2 (25). V.l.b. without bristles. 



3 (14). Male hind tibiae long and thickly haired on the inner 



side. 



4 (9). The second segment of the abdomen with two central 



hind marginal bristles. 



5 (6). Dorsum with four post-sutural central bristles. 



1859. Sarcophaga carnaria, L. 

 Very common, and by far the commonest of the 

 genus. 



6 (5). Dorsum with only three central post-sutural bristles. 



7 (8). Anus of the male wholly shining black. 



(i860, albiceps, Mg.) 



8 (7). Anus of the male with the first segment grey. 



1 86 1. Sarcophaga atropos, Mg. 

 Hesleden, 2 $ and 2 ?, August, 1900. 



9 (4). The second segment of the abdomen without any 



central hind marginal bristles. 

 10 (11). Dorsum with four central post-sutural bristles. 



(1859. carnaria, var. similis, Mde.) 



