Aphid Food Plant Catalogue. 209 



about nine-tenths remained approximately constant in most 

 cases though in one of the September individuals the cornicles 

 were dwarfed to ten-seventeenths the length of III. In this 

 same aphid there was but one sensorium on III as against 3 to 

 5 in most of the ragwort specimens and 6 to 8 in the summer 

 host collections. 



The key given on pages 216-218 has proved useful in sepa- 

 rating Macrosiphinn pseudorosac from other New England 

 members of the same genus, and is offered here on the chance 

 that it may be of some slight service in Eastern United States, 

 though the writer has not yet been able to construct a key to 

 these species which would seem to be at all adequate in view of 

 the wide range of individual variation of which these aphids 

 are capable. 



Several New Species 



The publication of the key necessitates the description of 

 several species which have been accumulating in the collection 

 until it is difficult to handle them any longer under manuscript 

 names. Not enough is known about most of them to warrant 

 giving them much space but it will serve to put them on record 

 with reference to their food plants and possibly to link into 

 data from other collections. 



MACROSIPHUM CARPINICOLENS N. SP. 



Apterous viviparous female : antennae, tibiae and distal 

 two-thirds of cornicle dark; frontal tubercles very prominently 

 produced ; antennal segments, particularly III with curved im- 

 brications closely set and with serrate edge which give a dis- 

 tinctive character at once noticeable ; III with from one to a 

 few sensoria in row near base, setae very short and stubby ; III 

 about two-fifths the length of hind tibia; relative lengths of 

 antennal segments III to VI approximately indicated by 50, 45, 

 40, 1 0+65 ; cornicle shorter than V with the distal one-sixth 

 reticulated; hind tarsus about three-fifths as long as base of VI. 



This species collected from the leaves of blue beech — (Car- 

 pinus caroliniana Walt.) in the vicinity of Orono during June 



