218 BULLETIN 14 5, UNITED STATES NATIONAL MUSEUM 



and also a specimen of politus (which is subspecies pseudocorijli 

 Fisher), with which he compared his canadensis. I have compared 

 this paratype with the type of plwmbeus and can not find any valid 

 characters for separating it from that species, which is a synonym 

 of politus. 



From our present knowledge of the biology of this species we must 

 consider politus a variable species, with the synonymy as given above, 

 but there are two forms which seem to be biologically different, which 

 can be considered as phytophagic subspecies, and which may be 

 separated from politus as follows : 



1. Male with the inner tooth of anterior and middle claws slightly shorter and 



broader than the onter one, and slightly turned inward ; male with the 

 front of head of the same color as rest of surface. Host : Hazel ( Corylus 



sp.) pseudocoryli Fisher. 



Male with the inner tooth of anterior and middle claws about equal in length 

 and thickness, and not turned inward ; male with front of head green__ 2. 



2. Color deep blue or bluish green. Host: Alder (Alnus sp.) burkei Fisher. 



Color green to cupreous or plumbeus. Host: Willow {Salix sp. ); maple 



(Acer sp. ) politus Say. 



AGRILUS POLITUS PSEUDOCORYLI, new subspecies 



Agrilus politus Chittenden (not Say), U. S. Dept. Agric, Div. Ent, Bull. 

 22, new ser., 1900, p. 68 (part). — Essig, Injurious and Beneficial Ins. 

 of Calif., 1915, p. 234 (part).— Frost, Canad. Ent., vol. 48, 1916, p. 

 368.— Felt, N. Y. State Mus., Bull. 200, 1918, p. 49.— Frost, Canad. Ent.. 

 vol. 52, 1920, p. 28.— Frost and Weiss, Canad. Ent., vol. 52, 1920, p. 220 

 (part). — Mutchler and Weiss, N. J. Dept. Agric, Bur. Statistics and 

 Inspection, Circ. 48, 1922, pp. 9-10 (part). — Wellhouse, Cornell Agric. 

 Exp. Sta., Mem. 56, 1922, p. 1106 (part).— Hutchings, 53d Kept. Ent. 

 Soc. Ontario, 1923, pp. 44-46, fig. — Champlain and Knull, Canad. Ent., 

 vol. 57, 1925, p. 113 (part).— Knull, Ohio State Univ. Studies, vol. 2, no. 

 2, 1925, pp. 47-48 (part). — Essig, Insects Western North America, 1926, 

 p. 403 (part). — Chamberlin, Cat. Buprestidae. 1926, pp. 77-78 (part). 



Ayrilus politus var. corylus Gibson (not Horn), 48th Kept. Ent. Soc. Ont. 

 for 1917 (1918), p. 112. 



Agrilus coryli Knull (not Horn), Canad. Ent., vol. 54, 1922, p. 85. 



Male. — This subspecies so closely resembles politus that it is deemed 

 lecessary merely to give the differences : Head, pronotum and elytra 

 uniformly reddish cupreous, with a violaceous tinge; anterior and 

 middle tarsal claws cleft closer to the middle, the inner tooth shorter 

 and slightly broader than the outer one, and slightly turned inward, 

 but the tips distant, and the elytra are usually more or less con- 

 stricted near the apex. Genitalia similar to those of politus Say. 



Female. — Similar to politus. 



Length, 5.5-7.5 mm. ; width, 1.25-1.8 mm. 



Type locality. — Lyme, Connecticut. 



