1873.] 0(J ' [Horn. 



P. sequalis, Say. Journ. Acad., 1825. p. 41 ; Lee. Bost. Journ. V, p. 

 6 3, pi. 4, fig. 9 ; affinis, Lac. loc. cit. fig. 10: Mars. Mon., 1855, p. 10S, pi. 

 8, figs. 1, 2. 



Sub-elliptical, piceous shining, strongly depressed, surface sparsely and 

 finely pnnctalate. Elytra with deep oblique humeral stria, first dorsal 

 visible at middle only and usually deep, second extending from apex to 

 beyond the middle, third stria basal, short. Propygidium finely and 

 sparsely punctulate. Pygidium coarsely sculptured, cicatrix like ! . 

 smoother and much less rugose £ • Anterior tibia? 5-dentate. Length 

 .10-.12 inch ; 2.5-3 mm. 



I have united the species affinis, Lee. to that of Say, as there does not 

 appear to exist between them any point of difference. The form of the 

 two is precisely identical, the difference in this respect indicated by Mar- 

 seul being rather sexual than specific ; the striae vary greatly in the degree 

 of impression, and by this, two forms might be selected as types of the 

 two species between which very few individuals would form a perfect 

 series. A glance at the figures by Marseul and Leconte will show the 

 propriety of placing the two as synonymous. 



Occurs from Canada to Georgia. 



P. estriatus, Lee. Proc. Acad., 1859, p. 314. 



Slightly more convex than mqualis and differs in its sparser and finer 

 punctuation and by all the striae obliterated with the exception of a 

 faint trace of the second at apex and the third at base. Length .10 inch ; 

 2.5 mm. 



I have also considerable doubt as to the propriety of retaining this spe- 

 cies as distinct, but the total obliteration of the first dorsal stria with the 

 somewhat more convex form have induced me to retain it until interme- 

 diate forms present themselves. 



Occurs from Canada to Louisiana. 



P. conjunetus, Say, Journ. Acad. 1825, p. 38: Lee. Bost. Journ. V, 

 p. 68, pi. 5, fig. 1 ; Mars. Mon. 1855, p. 89, pi. 8, Xo. 22, fig. 2. 



Oval, moderately convex, black, shining. Thorax finely punctulate, 

 punctures at the sides more distinct. Elytra with a very short and fine 

 subhumeral stria at apex, dorsals 1-4 entire, punctured, the fourth 

 broadly arching at base and joining the sutural, fifth stria extending in 

 front of middle. Propygidiuin moderately punctured, pygidium shining, 

 sparsely and minutely punctulate. Anterior tibiae bideutate. Length 

 .10 inch ; 2.5 mm. 



Occurs in the Gulf States. 



P. geminatus, Lee. Proc. Acad., 1859, p. 314. 



Similar in form to the preceding, but less shining. Elytra with the 

 subhumeral stria fine, extending from apex three-fourths to base, dorsals 

 1-4 entire', the latter arching at base to join the sutural, fifth stria ab- 

 breviated at base, stria; deeply impressed, intervals slightly concave. 

 Propygidium rather coarsely but sparsely punctured, pygidium nearly 



