284 Journal New York Entomological Society. [Voi. xxi. 



usually concave ; anal angle of wing usually reduced and without large 



alula; marginal cell typically long. (Opomyzina.) 3. 



Cheeks broad, usually more than one fourth the eye-height, at the vibrissal 

 angle usually broader than the diameter of the central part of the 

 face ; arista shorter and sub-bare, the microscopic hairs close together, 

 its basal segment usually short, the third antennal joint without per- 

 ceptible hairs arising from the spongy pubescence ; occiput flattened 

 or convex ; anal angle evident and with alula ; marginal cell typically 

 not long and narrow. (Chiromyiina.) 20. 



3. Dorsocentrals extending in front of the suture ; wings pictured 4. 



Presutural dorsocentrals absent or scarcely differentiated 6. 



4. Anal angle of wing evident; wings largely clouded with black but with 



numerous hyaline spots; oral vibrissae present; two fronto-orbitals ; 

 occiput fiat ; postverticals large ; pleurae bare ; tibiae with preapical 



bristle. (North America.) Spilochroa Williston. 



Anal angle reduced; wings hyaline, with some dark spots; no oral vibrissa; 

 one fronto-orbital ; occiput concave above ; no postverticals ; pleurae 

 hairy, one sternopleural, one mesopleural bristle ; no preapical bristle 

 on tibiae 5. 



5. Middle of cheeks with two stout vibrissae; no anal angle to wing. (Europe, 



North America.) Geomyza Fallen. 



Cheeks with short fine hairs only ; anal angle small but evident. (Europe, 

 Australia ?, North America ?) Opomyza Fallen. 



6. At least the front tibiae with preapical bristle on the outer side ; four 



scutellar bristles ; mesopleurae hairy 7. 



Tibiae without preapical bristle (in Amphoronenra the hind tibiae with a 

 weak preapical bristle) ; usually the basal scutellar bristles reduced 

 or wanting; mesopleurae bare; second vein usually extending close to 

 the costa; postverticals usually minute or wanting; costa not spined. 12. 



7. Vibrissa present ; wings usually pictured 8. 



No oral vibrissae ; wings hyaline ; one fronto-orbital ; front and hind tibiae 



with preapical bristle ; arista short-plumose ; abdomen slender, the 

 second and third segments with marginal bristles ; costa not spinose ; 

 anterior cross-vein before the end of the first vein ; ultimate section 

 of the fourth vein two thirds the length of the penultimate section ; 

 discal cell confluent with the second basal cell. 5 mm. (Java.) 



Apsinota Wulp. 



8. Base of fifth vein greatly thickened ; one fronto-orbital ; front tibiae only 



with preapical bristle. (North America.) ... .Tawrowiy/a Giglio-Tos. 



Veins not thickened ; three fronto-orbitals ; postverticals present ; all the 



tibiae with preapical bristle 9- 



9. The three fronto-orbitals in a single row ; two acrostichals, the mesonotum 



densely hairy but the hairs not arranged in rows ; discal and second 



basal cells confluent. (North America.) Pseudiastata Coquillett. 



Middle fronto-orbital proclinate and nearer the eye than the others are, 

 but two of the fronto-orbitals of large size ; discal cell complete ; 

 acrostichals numerous ; costa spinulose 10. 



