374 



Wirth and Stone: Diptera 



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Fig. 14:2. Adult Diptera. a, Stratiomyidae, Pteclicus, veins labeled according to Till yard 

 System (see explanation of fig. 14:1); b, Tabanidae, Tabanus, veins and cells labeled according 

 to Loew and Williston System; c, Asilidae, Mallophora, last tarsal segment; ventral view (emp, 

 empodium; pv, pulvillus; un, ungue or claw); d, Tabanidae, Tabanus, same (aro, arolium or 

 pulvilliform empodium); e, Cal liphoridae, Cal liphora, head, anterior view; f, Some, head, lateral 

 view; g, Same, thorax, dorsal view; h, Same, thorax, lateral view (a, Friend, 1942; b, Williston, 

 1908; c,d, Crampton, 1942; e-h, Walton, 1909). 



14. Third antennal segment compact, not simulated, bear- 

 ing an elongate arista RHAGIONIDAE 



— Third antennal segment annulated into 3-8 apparent 

 segments, rarely bearing an elongate arista (figs. 

 14:44a!, e, g; 14:47d, e) 15 



15. Tibial spurs absent; costa ending before wing tips; 

 squamae small or vestigial STRATIOMYIDAE 



— Spurs present at least on mid-tibia; costa continuing 

 around hind margin of wing; squamae large and con- 

 spicuous TABANIDAE 



16. Radial veins stout, running into costa near middle of 

 wing; medial veins weak and extending obliquely across 

 wing; cross veins and basal cells absent (fig. 14:1a") 



PHORIDAE 



— Radial veins not stronger than others; medial veins 

 not oblique 17 



17. Anal cell closed just before wing margin, therefore 

 short-petiolate; spurious vein running obliquely between 

 3rd (R 5 ) and 4th (M t ) veins and crossing the anterior 

 cross vein (r-m) (fig. 14:1;") SYRPHIDAE 



— Anal cell short, transverse, oblique or convex apically, 

 or rarely entirely absent 18 



18. Frontal suture or lunule entirely absent; front uniformly 

 sclerotized; no alula 19 



— Frontal suture well developed as a horseshoe-shaped 

 groove over the antennae, continuing down to separate 

 the center of the face from the sides; frontal lunule 

 a crescentic sclerite between antennae and frontal 

 suture; mesofrons nearly always differentiated from 

 the frontal orbits (fig. 14:2e) 20 



19. \nterior cross vein (r-m) situated at or before the basal 

 4th of the wing; 2nd basal and discal cells always 

 united; 3rd vein never furcate (fig. 14: It) 



DOLICHOPODJDAE 



— Anterior cross vein (r-m) situated far beyond the basal 

 4th of the wing; 2nd basal and discal cells usually 

 separated; 3rd vein usually furcate (fig. 14: le) 



EMPIDIDAE 



20. Second antennal segment without a longitudinal seam 

 on its upper outer edge; thorax without a complete 

 transverse suture before the wings; squamae small 

 ( ACALYPTRATAE) 21 



— Second antennal segment with a longitudinal seam 

 along upper outer edge which extends quite to the 

 base; thorax with a complete transverse suture before 

 the wings (fig. 14:2^, A); squamae large (fig. 14:2A) 

 (C ALYPTRATAE) 24 



21. Costa fractured just before end of subcosta; subcosta 

 usually incomplete , not attaining costa 22 



