2o8 DURHAM DIPTERA 



XXX 327. 



3 (2). Wings clear, quite unspotted. 



4 (5). X.5 2 some distance beyond X.4. 



(1645. h<zmon'hoidalis, L.) 



5 (4). X.5 2 almost in a line with X.4. (1646. nasalis, L.) 



6 (1). V.4. bent towards V.3. (V. 23). 



7 (16). 0.4 2 open, though much narrowed. 



8 (11). The facial pit, in which are the antennae, not divided 



into two ; lower part of the face without a shield. 



9 (10). Hairy species. 



328. Cephenomyia, Ltr. (1647. rufibarbis, Mg.) 

 Larvae live in the nostrils of deer. 



10 (9). Almost bare species. 



331. Pharyngomyia, Schin. (1653. picta, Mg.) 

 Larvae in the throat and nostrils of the red deer. 



11 (8). The facial antennal pit divided into two parts by a 



prominent partition, which on the lower part 

 spreads out into a facial shield. 



329. Hypoderma, Ltr. 

 Larvae live under the skin of cattle, deer, &c. 



12 (15). The hind metatarsi three times as long as the next 



tarsal joint. 



13 (14). Hairs on the dorsum, when viewed on a level from 



behind, almost uniformly greyish-yellow or dark 

 brown. (1648. lineatum, Vill.) 



14 (13). Hairs on the dorsum, when viewed from a level from 



behind, yellow on the front half, black on the 

 hinder half, sharply contrasted. (1649. bovis, Deg.) 



15 (12). Hind metatarsi at most twice as long as the next 



tarsal joint. (1650. diana, Brau.) 



16 (7). 0.4 2 closed and stalked (V. 23). 



330. CEstrus, L. (165 1. ovis, L.) 

 Larvae live in the nostrils of sheep. 



