7i6 



T. D. A. COCKERELL 



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Fig. I. — Osmylidia requieta (Scudd.), hind wing 



species distinguished by the structure of the wings must be regarded 

 as more or less provisional. Possibly the material will never be 

 sufficient to decide definitely whether we have too many or too few 

 specific names. 



Osmylidia requieta (Scudder) 



Professor Wickham found a hind wing, 14 mm. long, at the 

 Wilson Ranch. 



Palaeochrysa Scudder 



The living genus 

 Allochrysa Banks can- 

 not be distinguished 

 ■from this, unless we are 

 prepared to recognize as 

 generic characters which 

 would split the known 



species into still other genera. Allochrysa contains three species: 



Palaeochrysa virginica (Fitch) of the Eastern United States; P. 



parvula (Banks), from Florida; and P. arizonica (Banks), from 



Arizona. 



Palaeochrysa fracta n.sp. 



Anterior wing about 15 mm. long, 5I broad; hyaline with dusky 

 stigmatic region; venation pale ferruginous, probably green in life; 

 radial sector originating far basad of 

 ''third cubital" cell; costal area broad, 

 terminating about 6 mm. before tip of 

 wing; at least 17 costal cross-veins; 

 about 16 cross- veins between radius and 

 sector, the cells very broad (high), the 

 middle ones twice as high as long; 

 "third cubital" divided by a straight 

 vein in the middle, but the upper divi- 

 sion strongly and acutely produced 

 basally, so that the basal angle between 

 the sections is practically a right angle; 

 radial sector giving of? 13 oblique branches below; media beginning 

 to zigzag just after leaving " third cubital," its general course gently 

 curved until it meets the radial sector two cells before the apical 



Fig. 2.' — Palaeochrysa fracta. 

 "Third cubital" cell and adja- 

 cent parts. 



