2l6 MAINE AGRICUIvTUR.\Iv EXPERIMENT STATION. I912.. 



A few Species are placed on a dependable footing, however. 

 Mally separated a Ruinex species from a Polygonum species 

 (1894-95) and gave characteristic figures of immature stages 

 as well as excellent figures of the wings which clearly distin- 

 guish the two species he discusses. In order to avoid reverting 

 to previous mix-ups including these species, I have chosen to 

 attempt to trace them no farther back than Mally's paper. 



Aphalara polygoni Mally (Foerster?)- 



On October 18, 1911, large numbers of nymphs and adults 

 were found on 'Polygonum along the Stillwater river at Orono. 

 The nymphs were most numerous at the leaf axle. Many of 

 the pupae present molted after they were collected so that bred 

 material was obtained. Both the nymphs and adult specimens 

 accord exactly with the Polygonum species figured by Mally. 

 Lot 1 341 Sub 7. Figures 370, 379, 383 and 387. 



Crawford (1911) follows Loew in his synonomy for the 

 Polygonum, of Foerster. Material already determined as calthae 

 in the collections I have worked over I have left as such with 

 due respect for that determination. Enough variation is pres- 

 ent, however, among these specimens to make me hesitate in 

 absence of authentic host plant data to merge the polygoni of 

 Mally with them. Figures 364, 378, 382, and 384, represent 

 named "calthae" from the Colorado collection. Lot 1348 Sub 

 53, and Sub 47. 



Literature. 



1894 ('95 ) Mally, C. W. Psyllidae found at Ames, Iowa. Proc. Iowa 

 Acad, of Sc, Vol. II. Plate XV. Figs, i, 2, 3, Plate XVII. 

 Figs. 3. 



191 1 Crawford, D. L- American Psyllidae IV. ' Pomona Journal 



of Entomology, Vol. Ill, p. 495. , 



Aphalara nubifera sp. nov. 



Ten specimens are at hand with data "Ft Colhns Col., 

 6-13-99. Foothills, C. P. G. On Sisymhrium canescens, caus- 

 ing abnormal^ development of foliage in dense mass." This 

 collection can be separated from the polygoni by slight differ- 

 ences only for the two are certainly very closely allied. The 

 head and genitalia of both sexes resemble those of polygoni, 

 though there are distinctions. The forceps of the male are 



