100 BULLETIN BROOKLYN ENTOM. SOC. VOL. VII. November -1884.] 
P, amoenus, Say, J.A.P. II, 1823, p. 413; Lec, J.A.P. ser. 2, II, p. 33; bicolor 
Knoch. i. litt. 
The thorax is bright yellow and the elytra metallic blue. Length 
.20 to .32 inch. = 5 to8 mm. Hab. New York. 
P, blandus, Lec. Proc. Ac. Phil. 1850, p. 79. 
Resembles the preceding very closely, but the elytra vary to a lighter 
shade of blue and the basal joint of antenne is always pale. It is also 
narrower than amoenus. Length .30 inch. = 7.5mm. Hab. California. 
P, maculicollig, Lec. Proc. Am, Phil. XVI, p. 614. 
No specimens of this species are before us. pve give therefore Dr. 
Leconte s description in full, 
‘‘Blackish, piceous, finely sparsely pubescent. Head and prothorax finely not 
densely punctured, the latter a little wider than long, rounded at the sides, rufous 
with a broad black dorsal vitta. Elytra not wider than the prothorax, densely punct— 
ured. Beneath sparsely ee proper rufous. Hees piceous, coxe and 
middle coxze slightly sepatated, Antennze slender, filiform, a little more than one— 
half as long as the body, 4th joint equal to 5th. Length ose inch. = 6.5 mm.° Hab. 
Isle Royale, Lake Superior; but one specimen found.” 
P. obscurus, Lec. Proc. Ac. Phil. 1859, p. 79. < 
This species presents a slightly different form, the humeral angles 
being quite prominent and showing traces of a tubercle. The color 
varies from quite a light brown to a deep bluish black. Length .38 to 
.58 inch. = 9.5 to15 mm. Hab. California. 
P, ater, Lec. Mss. 
‘The description of this heretofore napnblisheaee species ‘has ‘been 
given us by Dr. Horn from the manuscript of the late Dr. Leconte. 
Black, very sparsely and finely pubescent, head punctured; -prothorax half wider 
than long, strongly punctured, much rounded at the sides; elytra strongly and equally 
punctured; antennze and legs tinged with piceous. ener .25 inch. =6.5 mm. Hab. 
Buffalo, N. V.; one ci. 
P. aeneus, Lec. Proc. Ac. Phil. VI, 1854, p. 18; Entom. Rept. 1857, p. 60. 
This very distinct species is of a uniform shining black color. Length 
.27 to .35 inch. = 7 tog mm. ‘Hab, Oregon. i 
P, dimidiatus, Kb. Fn. ‘Bor. Am. IV, p: 173; Lec. J.A.P. ser. 2; II, p. 33; an— 
ticum Dej. Cat. 3d ed. p. 355; palliatum Hald. Trans. Am. Phil. X, p. 41; Kalmt 
Schoenh.. Syn. Ins. I, 3, p. 4423, bajulus Linn, Mus. Lud. Ulss p- 70; Mannerheimi 
Lec. Ent. Rept. 1857, p. 60. 
This species varies in the lighter or r darker shade of its color but can 
always be recognized by the character given. Length .35 to .50 inch. 
=gto12.5 mm. Hab, United States. | 
