BRITISH FLIES 11 



DIPTERA ORTHOERHAPHA BRACHYCERA. 



t^liort Tabic of British Families. 

 This short table of families is naturally subject to some exceptions. 



1 (8) Three well-developed pulvilli (fig. 34). Species absolutelj without 



bristles. 



2 (5) Third joint of antennse annulated. 



(Conf. JCylojjhagus in Zepiida\) 



3 (4) Prffifurca starting almost opposite the base of the discal cell 



(fig. 35). Tibitu without spurs (except in Xylomyia). Thoracal 

 squamre usually small. I. Stratiomyid.k. 



4 (3) PraBfurca starting considerably before the base of the discal cell 



(fig. 39). Tibise spurred on at least the middle pair. Thoracal 

 squanue large. IV. TABANiDyE. 



5 (2) Third joint of antennre not annulated (except in Xylophagus). 



Posterior tibi?e spurred. 



6 (7) Thoracal squanue small. Abdomen elongate, usually conical. 



III. Peptide. 



7 (6) Thoracal squamse enormous. Abdomen balloon-like. 



VI. Cyktid^e. 



8 (1) Two pulvilli only (fig. 42). Species not truly eremocha^tous. 



9 (16) Basal colls long; anal cell long and pointed or even open. 



10 (13) Posterior cells three or four: small cross-vein absent (figs. 



43 and 4.5). 



11 "(12) Furry species. Posterior cells four. VIl. Bombylid.^. 



12 (11) Bare species. Posterior cells three. IX. Scenopinid.^^. 



13 (10) Posterior cells five; small cross-vein usually present (fig. 44). 



14 (15) A'ertex flush with the eyes; eyes of the male touching. Aerial 



furry species. VIII. Therevid.^. 



15 (14) Vertex sunken in bi»th sexes between the bulging eyes; eyes of 



the male widely separated. Pedestrian usually bristly species. 



XII. ASILID^. 



16 (9) Second basal and anal cells short, the anal cell (when present) 



being closed by a recurrent veinlet or with a blunt end (except 

 in Hyhotinoi) ; posterior cells never more than four. 



17 (22) Longitudinal wing-veins comparatively normal and running out 



fairly straight to the wingmargin. 



18 (21) Wings rounded at the tip and with at least one apparent cross- 



vein near the middle of the wing. 



19 (20) Upper basal cell about one-third the length of the wing. 



Proboscis horny and pointed. XIII. Empid^. 



20 (19) Upper basal cell very short and indistinct. Proboscis stout and 



pulpy. XIV. DOLICHOPODIDJi 



21 (18) AVings pointed at the tip and with no apparent cross-vein out on 



the middle of the wing. Mouth-margin bristly. 



XV. LONCHOPTERID.E. 



22 (17) Longitudinal veins extremely abnormal, those on the main portion 



of the wing being very faint (tig. 53). XVI. Phorid.e. 



