46 Maine Agricultural' Experiment Station. 1918. 



Figure 4, however, includes some features that concern 

 problems still unsolved. 164-12 represents the fall migrant of 

 a species found congregating in enormous numbers about the 

 base of a mountain ash tree (Pyrus sp) on the University of 

 Maine Campus. This has never been taken by the writer except 

 in 1912. It is apparently P. fit chit Baker and Davidson, as it 

 closely resembles the type slide of P. pyri (Fitch). In struc- 

 ture it is nearer to P. venafuscus than to any other species. 



Figure 4 (2-15) shows the antenna of the apterous vivi- 

 parous female of a root species, common on certain Compositae 

 in Maine, which I have considered to be Trama erigeronensis. 

 That this is the root form of a species present in Spring upon 

 other vegetation from which it migrates, seems probable. In- 

 dividuals with wing pads in the underground colonies are fre- 

 quently found, which would indicate a return fall migration ; 

 but I have only once succeeded in obtaining the mature winged 

 forms, (78-06). The antenna and thoracic waxplates of this 

 collection are given in Figure 4. If I am correct in my deter- 

 mination this fall migrant proves that erigeronensis should be 

 withdrawn from Trama and placed in the genus Prociphilus. 

 This insect comes nearer to P. corrugatans migrating from 

 Crataegus or P. alnifoliae from Anielanchier than to any other 

 member of the genus known to me ; and it may be discovered 

 that the so called Trama erigeronensis is the summer root form 

 of a species migrating from hawthorn or Juneberry. So much 

 variety exists in migrants from these two plants that I am not 

 at present confident that only two species are concerned. I do 

 not yet know what the specific characters are as any I have tried 

 to use for separation of these migrants seem to merge more 

 or less. 



This brief paper is written as a report of the present status 

 of this group in the East, in the hope that what slight new data 

 it contains may fit in with information which may be available 

 elsewhere. At any rate, eleven years seems long enough to 

 with-hold the winged form of P. (Trama) erigeronensis un- 

 published, in continued hope of linking it definitely into some 

 incomplete cycle. 



