80 NEW YORK STATE MUSEUM 



DASYNEURIARIAE 



The species belonging to the tribe Dasyneuriariae may be recog- 

 nized by the dentate claws, the third vein well separated from costa 

 and by the antennal segments of the male being almost invariably 

 with a distinct stem. The palpal segments may vary in number 

 from one to four and the antennal segments from 12 to over 20. 



This group comprises a large number of Phytophagous species, 

 the zoophagous Coccidomyias being exceptions. The two most 

 important genera are Dasyneura and Rhabdophaga, the former 

 being of medium size and usually brownish or yellowish. Rhabdo- 

 phaga includes a number of large, usually reddish or reddish brown 

 species which display a marked preference for woody tissues, 

 especially the cortical layers of willow. Alembers of these genera 

 occur very largely in leaf folds, leaf buds or loose, leafy bud galls. 



The reared parasites, recorded on the following pages, have been 

 kindly determined by Mr C. T. Brues of the Bussey Institution. 



Key to genera 

 a Palpi at least quadriarticulate 



h Antennae usually with 14 or more segments 



c Third vein uniting with costa very near or at the wing apex, 



straight and usually tapering distally 



d Ovipositor not chitinized apically, claws plainly unidentate. . 



Rhabdophaga Westw.^ 

 dd Ovipositor chitinized apically, bladelike, claws weakly 



toothed Procystiphora n. g. 



cc Third vein uniting with costa distinctly before the wing apex, 



straight or curved anteriorly and tapering but little 



distally 



d Wings hyaline, the membrane not scaled; female ovipositor 



long, sometimes longer than the body; circumfili not 



greatly produced Dasyneura Rond.^ 



dd Wings fuscous, the membrane scaled; female ovipositor 

 short; circumfili in male sometimes strongly produced, 

 much as in male of Bremia ....Lasiopteryx Westw. 

 hh Antennae with 11-12, rarely 13-14 segments 



c Basal clasp segment of the male genitalia rather stout 



d Third vein nearly straight, uniting with costa near the 



apex, antennal segments sessile in both sexes 



A r n 1 d i a Kieff . 

 dd Third vein strongly curved, uniting with costa at the 



distal 4th, antennal segments of the male stemmed 



N e u r o m V i a Felt. 



^ Riveraella Kieff., Trichoperrisia Kieff., Xyloperrisia Kieff. and Pernetty- 

 ella Kieff. appear to be closely related. 



^ We are unable at present to separate satisfactorily Microperrisia Kieff. 

 irom all members of this large series. 



