232 THE CANADIAN ENTOMOLOGIST. 



The genera are not numerous and may be separated as follows : 



Table of Genera. 



Hind wings with one closed submarginal cell. 



Front wings with four submarginal cells • • 3- 



Front wings with three submarginal cells 2. 



2. First submarginal cell receiving both recurrent nervures ; antennae 



6-jointed Paraperga, Ashm., n. g. 



(Type P. jucunda, Kirby.) 

 First and second submarginal cells each receiving a recurrent nervure ; 



antennae 7-jointed Pseudoperga, Ashm., n. g. 



(Type P. polita, Leach.) 



3. Antennae 6-jointed, joints 3 to 5 of an equal length or nearly so ; head 



subquadrate, scarcely so broad as the thorax ; first submarginal cell 



not unusually small Perga, Leach. 



Antenna 7-jointed ; head very large quadrate, fully as broad or a little 

 broader than the thorax ; first submarginal cell very small, half the 



length of the second, or smaller Neoperga, Ashm., n. g. 



(Type P. amenaida, Kirby.) 



DIASPIS AMYGDALI IN MASSACHUSETTS 



BY R. A. COOLEY, B. S. , AMHERST, MASS. 



In January of this year Mr. A. H. Kirkland sent me specimens of a 

 scale insect he had taken from Prunus mume at the Arnold Arboretum, 

 Jamaica Plain, Mass., whicli on examination proved to be Diaspis 

 amygdaii, Tryon. A little later Mr. Kirkland sent me more specimens 

 which he had taken from Primus subhirtella at the Arboretum. Speci- 

 mens of the scale were sent to Dr. L. O. Howard, who confirmed my 

 identification, staling also that he had asked Mr. Coquillett to examine 

 the specimens and had received the report that he could find no difference 

 between them and Diaspis amygdaii. The infested trees came from 

 Japan, the Prunus mutne in the spring of 1894 and the Prunus sub- 

 hirtella in the spring of 1897. 



These specimens, with others of the same species received from 

 various sources, have been compared with specimens of Chionaspis 

 prunicola, Maskell, received from the author of the species, without 

 finding the slightest difference. I therefore consider Chionaspis prunicola 

 a synonym of Diaspis amygdaii, which has priority. 



