TAXONOMY OF MUSCOIDEAN FLIES — TOWNSFND \2"J 



2. First longitudinal vein elongate, small crossvein placed opposite end of 



auxiliary vein, fourth vein very obtusely bowed, apical cell sharp- 

 angled at extremity and short petiolate Alophora 



First longitudinal vein not elongate, small crossvein placed opposite end 

 of same, fourth vein roundly bowed, apical cell usually long petiolate. 



Hyalo myia 



3. Second longitudinal vein ending opposite the junction of third and 



fourth veins, wings of male usually much widened Phorantha 



Second longitudinal vein elongated beyond junction of third and fourth 

 veins, wings of male not widened, apical cell very long petiolate, 

 fourth vein roundly bowed Paralophora 



Genus Alophora Robineau-Desvoidy 



Alophora sp. — A large species from Texas. The female shows 

 ventral plates overlapped by dorsal plates. The male shows ventral 

 plates free, at least those of second, third, and fourth segments, with 

 membrane widely exposed on each side. 



Genus Phorantha Rondani 



The genus Alophora has the front prominent in profile above in- 

 sertion of antennae. Phorantha has front flattened, and with greater 

 slope so as to present in profile an almost perfectly straight line 

 from insertion of antennae to vertex. 



Probably all, or nearly all, of the various forms of the Alophorini 

 that have been described are distinct and entitled to recognition. 

 We know practically nothing of the early stages or the mating of the 

 adults, and it is premature to attempt to outline the synonymy in the 

 absence of such knowledge. 



Tribe Cistogasterini 



Genus Gymnoclytia Brauer and von Bergenstamm 



The genus Gymnoclytia is distinct from Cistogaster. The pe- 

 duncle of apical cell is continuous with fourth vein in Gymnoclxtia, 

 but with third vein in Cistogaster. 



Gymnoclytia has ventral membrane (female) very widely visible 

 and ventral plates free, much as in Gymnosoma. 



Gymnoclytia occidua Walker.- — Male. — Thorax brassy or golden 

 pollinose, with two straight narrow median vittae extending from 

 front margin to behind suture, and two irregularly widened vittae 

 obsolete before and interrupted at suture. Abdomen more or less 

 ferruginous, sometimes entirely so, but usually with a longitudinal 

 fuscous stripe in connection with a median pollinose vitta, and more 

 or less brown on third and fourth segments with grayish pollen. 



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