THE CANADIAN ENTOMOLOGIST. 119 



NOTES ON NORTH AMERICAN HESPERID^. 



BY EUGENE MURRAY AARON, PH. D., PHILADELPHIA, PA. 



From time to time for the past ten years I have been in the habit of 

 receiving, from various collectors in this country and Europe, specimens 

 of North American Hesperidce for comparison and identification with my 

 large collection, which has been justly famous for its completeness. As 

 this collection is now no longer in my possession, being now the property 

 of my friend C. B. Aaron, of Philadelphia, and as I have transferred my 

 allegiance from entomology to ethnology it has occurred to me that it 

 will be well for me to give here to the students of the Hesperidce the 

 benefit of such tables, notes and compilations as have, in years past, been 

 of value to me in the identification of the species in this difficult family. 



KEY TO SOME OF THE GENERA OF HESPERID/E. 



Knob of antenna bent or curved A. 



Knob of antenna straight B, 



. I Knob abruptly bent C. 



 \ Knob curved D. 



f Bent portion of knob not over yi entire length E. 



C. \ Bent portion of knob a long fine point, often as long 



(_ as remainder of knob Eudamus. 



p, ( Abdomen reaching or surpassing the anal dLr\g]e.Fa}nphUa{i) 

 ' \ Abdomen scarcely reaching anal angle Amblyscirtes. 



■p. I Knob of antenna elongate or ovoid Pyrgus (3) 



\ Knob of antenna spindle-shaped H. 



TT J Hind wings angulated or crenulated Systasea. 



' \ Hind wings not angulated or crenulated K. (2) 



/ Two basal joints of palpi bright coloured 



y- J beneath Pholisora. 



' \ Two basal joints of palpi black or fuscous 



( beneath Thanaos. 



Ti j Tibiae with spurs M. 



( Tibise without spurs Carterocephalus. 



», / Last joint of antenna rounded, no spine N. 



 ( Last joint of antenna with short slender spine. . , Ancyloxypha. 



i Antenna 1/3 length of primaries, tibiae nearly naked. CopcRodes. 

 N. J Antenna y^, length of primaries, tibiae with long 



( hairs Thymelicus. 



It must be remembered in using this table that it is arranged largely 



to aid in the differentiation of species along the generic lines at present 



accepted by most American Lepidopterists. The following remarks will 



