84 Maine; agricuIvTural e;xpe;rime;nt station. 1911. 



reticulated and imbricated cornicles of any species of Macrosi- 

 phum come out only in the mature insect and do not hold useful 

 for the nymphs. 



In general Macrosiphiim solanifolii* is a large, active species, 

 usually green but very often pink, and sometimes yellowish, 

 especially the young of the pink individuals. 



Decidedly pink individuals occur both with the winged and 

 apterous viviparous females. At Houlton, August 17, 1905, 

 a pink- winged viviparous female was taken with 12 young, 7 

 of which were decidedly green and 5 decidedly pink. About 

 20 pink viviparous specimens collected at Maple Grove, August 

 19, 1906, were placed upon potato in the insectary. Some were 

 winged and some were apterous. On August 29 the young of 

 these were all found to be pink, though many were toning into 

 pale yellow. The insectary specimens of oviparous females 

 were largely pink, though many were yellow, and a few dis- 

 tinctly green. 



Macrosiphum solanifolii. Winged viviparous female. — Head 

 yellowish green. Antennae, proximal segments pale green, dis- 

 tal segments dark ; length of segments : III, .88 to .96 mm. ; 

 IV, .76 to .9 mm.; V, .64 to .72 mm.; VI, .16 to .2 mm.; VII, 

 .96 to 1. 12 mm.; total length I to VII, 3.6 to 4.05 mm. Pro- 

 thorax and thorax light yellowish green. Wings hyaline, veins 

 dark brown, very slender, stigma pale brown. Total wing ex- 

 pansion 8.1 mm. Legs with proximal part of femora and tibiae 

 pale, tarsi and distal part of femora and tibiae dark. Tarsi 

 .16 to .2 mm. Abdomen light green unmarked dorsally or 

 ventrally. Cornicles, with proximal portion green and distal 

 portion dark brown, imbricated along the center but strongly 

 reticulated at tip, cylindrical, length .95 mm. or about five times 

 length of tarsus. Cauda light green, ensiform, length .48 mm. 

 or about one-half length of cornicles. Total length of body 

 to distal tip of cauda and exclusive of antennae 2.9 to 3.37 mm. 



Winged viviparous female, pink individual. — Head light yel- 

 lowish. Antennae with I and II light yellowish, rest dark. 

 Prothorax and thorax light yellowish pink. Abdomen pale 

 pink. Cornicles light yellow with tips dusky and strongly reti- 

 culated. Cauda pink. 



* For a fuller discussion of this species the reader is referred to 

 Bulletin 147 of the Maine Agricultural Experiment Station. 



