Oct., '09] ENTOMOLOGICAL NEWS 34! 



of September the true sexes, the winged males and the ap- 

 terous oviparous females are abundant. Females kept in cap- 

 tivity deposit eggs upon the dried leaves and stems of the 

 trefoil. A careful field examination of the infested plants late 

 in September results in finding some eggs upon the stems and 

 crumbled leaves of the trefoil, but the eggs are much more 

 numerous upon the sticks and stones immediately about the 

 base of the infested plant. 



The colonies which furnish data for this species were found 

 along a sandy stretch near Veazie, Maine, where the species 

 has been exceedingly abundant for the past three seasons. 



There is something indescribably distinctive about the spe- 

 cies when observed even with the unaided eye. The first im- 

 pression they give the finder is that "here is something out of 

 the ordinary in the aphid line," before a detailed examination is 

 made. 



The large per cent, of abnormal veins both in the males 

 and the alate viviparous forms in each season's collection made 

 the examination of a great number of specimens necessary in 

 deciding upon the type of venation normal for this species. 



Too much stress should not be laid upon the colors of aphid. s 

 as they vary more or less, the more recently molted individuals 

 being in general paler than the others. Neither can the anten- 

 nal measurements be taken as absolute as different individuals 

 vary both as to the length of the entire antennae and as to the 

 relative length of the different segments. 



However, both the color scheme and the antennal measure- 

 ments are a great convenience in the sum of characters, if given 

 their relative values. 



EXPLANATION OF PLATE XIX. 



1. Head and antenna of apterous viviparous form. 



2. Head and antenna of alate viviparous form. 



3. Head and antenna of apterous oviparous female. 



4. Head and antenna of male. 



5. Head and antenna of pupa. 



6. Wings, showing the type of venation most frequent for this 

 species. 



