NOTES ON PSYLLIDAE:* 

 Edith M. Patch. 



The present paper is a record of species many of which have 

 "been kindly lent me for study. For the most part the available 

 data are very meagre and for this reason the accession num- 

 bers are usually given together with what collection notes have 

 been preserved, in the hope that more biological information 

 may be added by others. Detailed descriptions have been 

 avoided as the distinguishing characters are shown more clearly 

 in the illustrations. 



Lot 1339 includes those specimens lent by Cornell University; 

 IvOt 1347, by Doctor C. Gordon Hewitt; Lot 1348, by Professor 

 C. P. Gillette; Lot 1440, by Doctor W. E. Britton. 



ApHAIvARA. 



Very little biological information concerning the species 

 Aphalara in this country seems to be available. It is possible 

 that when more collections of the nymphal stages have been 

 made with the accompanying host plant data the species will be 

 more easily defined. But at present from large series of speci- 

 mens in several widely separated collections it has not been 

 apparent to me in all cases which variations are of specific and 

 which of individual significance. The shape of the wing from 

 elongate to rotundiform; the breadth of the arch of Cu ; the 

 length of the branches of M ; the presence, absence or degree ot 

 wing maculation ; the length of the caudal segment of the 

 female; all these are certainly subject to much individual varia- 

 tion in closely allied species and the resulting confusion indi- 

 cates that systematic work with this group should be undertaken 

 only when a background of ecological data is at hand. 



* Papers from the Maine Agricultural Experiment Station : Ento- 

 mology, No. 55. 



