ABSTRACTS. 305 



I undertook some transfer tests during the summer of 19 12, 

 and found that Aphis brevis accepted both alsike and other 

 clover (Trifoliiim spp.). Migrants placed on alsike and white 

 clover produced nymphs that fed with apparent satisfaction on 

 the test plants. The potted white clover was, however, more 

 easily managed in the laboratory, so it was selected for the 

 main rearings. The transfer was made on June 14. The mi- 

 grants fed on the clover, and their abdomens became distended. 

 At this time the head, thorax, and cornicles were black, and 

 abdomens olive green, with distinct black lateral dots. By 

 June 21 their abundant progeny were established on both stem 

 and runner. The nymphs at first were pale and pellucid, with 

 rosy head and prothorax. By June 24 this generation had 

 matured, but did not begin to reproduce for a day or two. 



Aphis bakeri Cowen (Short-beaked clover aphid). 



About the middle of August, 1914, large numbers of an aphid 

 from Trifolium pratense were taken by INIr. George Newman 

 at Orono, Maine. This species is distinct from the one just 

 discussed, and yet they' resemble each other enough so that both 

 species have sometimes been listed under the same name. The 

 fact that both species are found on hawthorn in the spring and 

 migrate to clover in the summer may be partly responsible for 

 this confusion. 



The habitat of the short-beaked clover aphid on clover seemed 

 to be the ventral side of the leaf and the stem near the ground. 

 The colonies were frequently covered by "ant sheds," as well as 

 sometimes extending for a short distance underground. 



This species is smaller, more slender and graceful than the 

 long-beaked clover aphid. Joint V of the antenna is noticeably 

 shorter than IV and is without sensoria, except the usual distrd 

 one, in the summer winged viviparous female. The stigma is 

 rather narrow and the distal end acute. ^The beak hardly 

 reaches the second coxa and frequently falls considerably short 

 of it. The prothoracic and abdominal lateral tubercles are 

 prominent, but very slender. Both species have the cornicles 

 and Cauda very short. 



