JDICRANOMYIA. 363 



before and sometimes beyond the origin of the 2nd vein. 

 Anterior cross-vein nearly always at some little distance beyond 

 the origin of the 3rd vein ; posterior cross-vein generally before 

 the discal cell or at its base ; 5th, 6th, and 7th veins nearly 

 straight. 



Table of Genera O/LIMNOBIINI. 



1. Eyes separated by a distinct irons in both 



sexes * 2. 



Eyes contiguous above and below antennae in 

 both sexes , 5. 



2. Proboscis conspicuously prolonged ; always [p. 387. 



longer than head '. . GEHANOMYIA, Hal., 



Proboscis shorter than head 3. 



3. Origin of the 3rd longitudinal vein normally 



situated, as also position of anterior cross- 

 vein ; the latter, with also the discal cell, 

 always beyond (generally considerably be- 

 yond) the middle of the wing; posterior 



cells of normal length 4. 



Origin of 3rd longitudinal vein, the position 

 of the anterior cross-vein and discal cell all 

 so proximal (about the middle of the wing) 



that all the posterior cells are exceedingly [p. 410. 



long .". LIBXOTKS, Westw., 



4. Auxiliary vein ending as a rule considerably 



beyond origin of 2nd longitudinal vein, 

 generally about half-way between that 

 point and the tip of the 1st longitudinal 

 vein. Genitalia of male with the 2nd joint [p. 39(5. 



of the claspers forming a horny hook LIMNOBIA, Mg., 



Auxiliary vein ending as a rule nearly opposite 

 to or only slightly beyond the origin of the 

 2nd longitudinal vein. Genitalia of male 



with the second joint of the claspers gene- [Steph., p. 363. 



rally large and fleshy DICRANOMYIA, 



5. Antenna3 with a pair of pendant conspicuous 



processes attached to each joint of the [Brun., p. 407. 



flagellum on the lower side CKRATOSTEPHANUS, 



Antennae normal ATYPOPHTHALMTJS, 



[Brun., p. 408. 



Genus DICRANOMYIA, Stepli. 



Dicranomyia, Stephens, Catal. Brit. Ins. ii, p. 243 (1829). 



Siac/ona, Meigen, Syst. Beschr. vi, pi. Ixv, fig. 7 (1830). 



? Glochina, Meigen, op. cit. p. 280. 



Nmnantia, Bigot, Ann. Soc. Ent. France (3), ii, p. 470 (1854). 



GENOTYPE, Limnobia modesta, Mg. ; designated by Coquillett, 

 1910. 



Head : eyes large, glabrous, contiguous or subcontiguous below 

 head, frons of moderate width. Proboscis subcylinclrical, pro- 

 jecting, not longer than the head ; palpi short. Antennso 14-jointed, 

 of moderate length, not reaching the root of the wing if bent 



