379 

 Wirth and Stone: Diptera 



19 



20 



26 



V2 



53 



. Wing with Sc relatively short, Sc, ending before the 

 level of the fork of Ra; antennae with long conspicuous 



verticils Pilaria Sintenis 



Wing with Sc longer, Sci ending opposite or beyond the 

 fork of Rs; antennal verticils not unusually long .... 20 



. Head strongly narrowed and prolonged behind; radial 

 and medial veins beyond cord long and sinuous; vein 

 R 3 extending generally parallel to vein R 4 , not diverg- 

 ing markedly at tips; vein second A strongly curved 



to margin Pseudolimnophila Alexander 



Head broad, not conspicuously narrowed behind; radial 

 and medial veins beyond cord more nearly straight; 

 vein R 3 diverging strongly from vein R 4 , cell R 3 con- 

 spicuously widened at margin; vein second A not 



curved strongly to margin 



Limnophila Mac quart (in part) 



Wing with cell M, present Crypteria Bergroth 



Wing with cell M t lacking 22 



Two branches of Rs reach the wing margin 



G onomyia Meigen (in part) 



Three branches of Rs reach the wing margin 23 



Wing with cell R 3 short, vein R 3 shorter than the 



petiole of cell R 3 24 



Wing with cell R 3 deep, vein R 3 longer than the petiole 



of cell R 3 27 



Wing with vein R, present 25 



Wing with vein R a lacking 26 



Wing with Rs long and straight, exceeding the distal 

 section of M 1+1 ; tuberculate pits on cephalic part of 



praescutum; trochanters elongate 



Rhabdomastix Skuse (in part) 



Wing with Rs shorter, less than the distal section of 

 M lt] ; tuberculate pits removed from cephalic margin 



of praescutum; trochanters short 



Polymeda Meigen (in part) 



. Wing with Sc long, Sci extending to near opposite or 

 beyond mid-length of Rs; m-cu at or beyond fork of M 



Rhabdomastix Skuse (in part) 



Wing with Sc short, not extending to beyond mid-length 

 of Rs; if sc is relatively long, m-cu lies more than 



its own length before the fork of M 



G onomyia Me igen 



Wi ngs with distinct macrotrichia in outer cells 28 



Wings with outer cells glabrous 29 



, Wing with Rs shortened, its union with R J+3< .« forming 

 an angle, so cell R, is nearly equilateral in outline 



Cryptolabis Osten Sacken 



Wing with Rs long, normal in position, cell R, elongate 



Ormosia Rondani 



Wing with Rs ending in cell R 3 there being no element 



R a +j*4 Erioptera Meigen 



Wing with Rs ending in cell R 4 , cell R 3 being petiolate 



by a distinct element R J+3+4 



Polymeda Me igen (in part) 



Wing with vein R a lacking 31 



Wing with vein R 2 present 32 



Rostrum short and inconspicuous; Rs long and straight, 

 running close to R, and in alignment with R Jt3 ; r-m 



distinct Elliptera Schiner (in part) 



Rostrum of moderate length, about equal in length to 

 remainder of head; Rs short, gently arcuated, not in 

 alignment with R 2 + 3 ; r-m often shortened or obliterated 



by approximation of adjoining veins 



Helius Lepeletier 



Wing with Rs long and straight; antenna 16-segmented 



33 



Wing with Rs shorter, and more arcuated; antenna 



14-segmented Limonia Meigen 



Anal angle of wing very prominent, almost square; Rs 

 long, diverging at an acute angle from R,, ending 

 approximately between the branches of Rs or in align- 

 ment with R 4< . 5 Antocha Osten Sacken 



Anal angle of wing normally rounded; Rs long, lying 

 very close to R, and nearly parallel to it, its end in 

 alignment with R a+3 ; basal section of R 2 , 3 short and 

 arcuated, diverging from the end of Rs at nearly a 

 right angle Elliptera Schiner (in part) 



Larvae • 



1. Body cylindrical, if more or less depressed ti.<- r. with 

 long spines or leaflike projections (figs. 14:86; 11:1', 

 f.j.n.o) 3 



— Body much depressed! ventral surface flatte 

 almost leechliko; hairy Dactylolabis 



2. Body provided with elongated spinos or leaflik>' 

 projections 3 



— Body without distinct spines 1 



3. Body appendages very long and filiform (fiy. 11:1c) 



Phalacrocera 



— Body appendages short, leaflike or tuberculate, with 

 3 or 4 teeth on anterior convex side of some of the 

 appendages Triogma 



4. Spiracular disc surrounded by 6 or 8 lobes (fig. 14:4a, b) 



24 



— Spiracular disc not as above 5 



5. Spiracular disc with 2 long ventral lobes (fig. 14:1/) 



6 



— Spiracular disc not as above 8 



6. Spiracles lacking or vestigial (fig. 14:4/); mentum not 

 completely divided medially; hypopharynx a rigid 

 double comb; larvae in silken cases Antocha 



— Spiracles large, exposed (fig. 14:4o); mentum com- 

 pletely divided medially; hypopharynx labriform .... 7 



7. Abdomen without prolegs but with raised welts on 

 segments 4 to 7, these covered with microscopic 

 scurf (fig. 14:4o) Pedicia 



— Abdomen with conspicuous cylindrical prolegs on 

 segments 3 to 7, these with circlets of conspicuous 

 hooklets around their ends Dicranota 



8. Head capsule massive, complete, posterior incisions 

 usually narrow (fig. 14:5e) 9 



— Head capsule of 4 or 6 slender rods, posterior incisions 

 dee p 17 



9. Mentum completely divided, a toothed plate on each 

 side; abdominal segments without distinct creeping 

 welts 10 



— Mentum, if present, and sclerotized, not completely 

 divided (fig. 14:5c); abdominal segments with basal 

 creeping welts 15 



10. Spiracular disc with 4 lobes (fig. 14 :4<7) 11 



— Spiracular disc squarely truncated, surrounded by 

 5 lobes 12 



11. Each mental plate 4-toothed; hypopharynx labriform 



Paradelphomyia 



— Each mental plate with 7 or 8 teeth; hypopharynx a 

 comblike ring Pseudolimnophila 



12. Spiracular disc ending in 5 flattened black plates 

 which are finely toothed along their margins 



Ormosia (in part) 



— Spiracular disc not as noted above 13 



13. Ventral plates of head capsule expanded and with 5 to 

 8 teeth at anterior end; color green; spiracular disc 

 reduced, almost unmarked Polymeda (in part) 



— Ventral plates not toothed as described above 14 



14. Marks of all the lobes of spiracular plates solidly black 



Polymeda (in part) 



Ormosia (in part) 



— All paired lobes dark within, with a median light line 



G onomyia 



Polymeda (in part) 



Ormosia (in part) 



15. Body cylindrical; spiracular disc with 4 or 5 lobes 

 (fig. 14:5/), or in some cases nearly obsolete 16 



— Body depressed; spiracular disc with 4 lobes; abdominal 

 segments 3 to 9 with dorsal and ventral creeping 

 welts, the latter naked Elliptera 



16. With dorsal and ventral welts on abdominal segments 

 (fig. 14:4n); mentum with more than 5 teeth (fig. 14:5c) 



Limonia 



— With 6 ventral welts only, body with long dark pubes- 

 cence Helius 



17. Blades of maxillae not produced beyond the retractile 



Adapted from Johannsen, 1934. 



