THE CANADIAN ENTOMOLOGIST 241 



Acanthocephala declivis Say. 



Acanthocephala declivis Say, New Harm. Ind., 1832. 



Diactor alata Burm., Handb., II, I, p. 334, 1835. 



Metapodiiis thoraciciis Dall., List, II, p. 428, 1852. 



Acanthocephala suhalata Distant, Biol. Cent. Amer., p. 119, 

 1881. 



The extremely wide and concave thorax readily separates 

 this species, although the shape of the posterior lateral angles 

 varies a great deal. These are broadly rounding in some speci- 

 mens, in others acutely pointed, with every intergradation to be 

 found. The form of the dilatation of the posterior tibia places 

 it with latipes Drury and granulosa Dall. The general size varies 

 from specimens as small as terminalis Dall. to those larger than 

 granulosa Dall. 



The species is known to occur throughout Central America 

 and north into southern United States. 



THE BLACK CHERRY APHIS, MYZUS CERASI. 



On page 434 of the Canadian Entomologist for 1917, Mr. 

 W. A. Ross calls attention to the fact that in my paper before the 

 California State Fruit Growers' Convention in 1914, the black 

 cherry aphis was referred to as a species not having alternate food 

 habits. Since that date we have recorded this species a few times 

 in small numbers upon water cress, collected by L. B. Bragg. 

 However, our observations and records indicate that this aphid 

 continues throughout the year upon the cherry in Colorado, and 

 we have never found it abundant upon the alternate host. 



No one in the department recalls seeing this species upon the 

 sweet cherries — Royal Ann, Bing, Black Tartarin, Black Re- 

 publican, etc., and we can recall but very few cases where it has 

 been seen in any abundance upon the semi-acid cherries, the Dukes, 

 but it is a common and, often, abundant louse upon the sour red 

 cherries, English Morello, Montmorency wragg and their like, on 

 the eastern slope of the mountains. It yields readily to the ap- 

 plication of the contact insecticides as the leaves do not curl enough 

 to give protection to the lice. 



C. P. Gillette. 



