250 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [BuU. 



Psyllopsis Fr. Loew. 

 P. fraxinicola (Foerster). (PI. vi, 7.) 



Verb. Natw. Ver. Preuss. Rheinl., v, yz, 1848. 



Pale yellowish green psyllid with moderately long genal cones 

 and long slender antennae. On green ash. 



Storrs, 24 Aug., 1909 (W. E. B.). 



Literature. 



Britton, W. E. 1916. Two Psyllids New to Connecticut. Fifteenth 

 Report of the State Entomologist, 1915. In Report of the Connecticut 

 Agricultural Experiment Station. 

 Comstock, J. H. 1918. The Wings of Insects, 283-285. 

 Crawford, D. L. 1914. A Monograph of the Jumping Plant-lice or 

 Psyllidae of the World. United States National Museum, Bulletin 85. 

 Patch, Edith M. 1909. Homologies of the Wingveins of the Aphididae, 

 Psyllidae, Aleurodidae, and Coccidae. Annals of the Entomological 

 Society of America, 2: 101-129. 

 191 1. Psyllidae, in Bulletin 187. Maine Agricultural Experiment Station. 

 1912a. Notes on Psyllidae : Livia. Psyche, 19 : 5-8. 



1912b. Notes on Psyllidae. Bulletin 202, Maine Agricultural Experi- 

 ment Station. 

 1916a. A Psyllid Gall on Juncus (Livia maculipennis Fitch) Psyche. 

 23: No. I. 

 Stough, H. B. 1910. The Hackberry Psylla, Pachypsylla c.-tnamma. 

 Kansas University Science Bulletin, 5: 121-165. 



Family APHIDIDAE. 

 By Edith Marion Patch, Ph.D.* 



On account of their small size aphids are to a great extent 

 unnoticed ; but when conditions are favorable to their increase 

 there are many species of these little creatures that are capable of 

 serious damage to the vegetation which they frequent and staple 

 crops often suffer severely. 



These insects occur in winged and wingless forms and both 

 feed by means of a jointed beak which they push into the tissues 

 of the plant in order to suck up the sap which forms their food. 

 They range from a little more than one-half a millimeter to about 

 six millimeters in length. Some are sporadic in habit, while some 

 live in gregarious colonies on stem or leaf or roots as their food 

 plant. Some are exposed but many are protected by curled leaves 

 or definite gall growths their presence causes. 



Although the life cycle varies greatly for different species of 

 aphids, the following points seem of most significance for a general 

 statement. 



In the north most aphids winter in the ^gg stage. From the 



* Papers from the Maine Agricultural Experiment Station : Entomology 

 No. 105. 



