8 PROCEEDINGS OF THE ACADEMY OF 



short, with their edges ranch thickened. The head has its vertex strongly 

 canaliculate. Its anterior face is marked with two small punctiform impres- 

 sions. The lower border is not very strongly emarginate, and is set with a 

 fringe of short thick hairs. The antennae are mostly dark colored, scarcely at 

 all clavate and coarsely pubescent. The feet are rough, with closely set, stiff 

 hairs. The anal scutum is prolonged posteriorly, so as to come almost to a 

 blunt point. The genital appendages in the male are short and thick. Their 

 terminal spine is slightly curved at its base, thence is nearly straight, save at its 

 distal extremity, where it is abruptly curved, becoming nearly horizontal. It is 

 beset with very numerous long hairs. We have examined them in eighteen spe- 

 cimens, and found them to agree perfectly. The female genital appendages 

 consist of a pair of short, conoidal, very pilose processes, which have an opening 

 along their inner edge. 



Length one inch and an eighth. 



JIab. Illinois. Smithsonian Coll. R. Kennicott. 



Var. ? P. laete castaneus, fulvo vel rubro macnlatus, linea nigra dorsali or- 

 natus; lamiuis lateralibus marginibus rubris vel fulvis. _ _ _ 



This is possibly a distinct species, but as I have seen but a very few indivi- 

 duals, and the male genital appendages do not differ from those of P. hispidipes, 

 I prefer not risking a synonym. Whether the spots are yellowish or red in 

 the living animal, the length of time our individuals have been preserved in 

 alcohol precludes me from deciding. 



The spots are sometimes arranged regularly two large ones on each side ot 

 the mesial line, and a row of small ones on the posterior border. 



JIab. Illinois. Smithsonian Coll. R. Kennicott. 



Subgenus STENONIA. 



P. CERASINUS. 



P. dilute cerasinus ; dorso complanato ; antennis modicis pubescentibus, 

 nonnihil clavatis, nonnihil brevibus; scutis squamis obsoletis ornatis, margin- 

 ibus lateralibus serratis ; appendici genitali masculas spina terminale lata, 

 oblique truncata, utrinque processu longo setaceo curvato instructa. 



The head has the median furrow on its vertex illy pronounced. The ante- 

 rior face is sparsely pilose, and has its lower margin broadly but shallowly 

 emarginate. The scuta have a double row of scales, obsolete but otherwise 

 similar to those of the following species. Sometimes these are entirely lost. 

 The lateral margins of the side plates are rounded slightly and minutely serru- 

 late. They seldom have more than three serratures on each side. The ter- 

 minal scutum is triangular, with its obtuse apex bent downwards. It is 

 sparsely pilose. The legs are quite hairy, and light colored. Their second 

 joint is tumid. The genital appendages in the male are peculiar. The termi- 

 nal spines are broad and short, and superiorly very obliquely truncated, with 

 two small hamular processes. On each side a long, seta-like process springs 

 from the base. The outer, much the longer of the two, throws an arch entire- 

 ly over the short spines. The inner is straighter. They both have one or two 

 thorn-like excrescences. 



// a 6. Oregon. Museum of Smithsonian Institution. 



Subgenus STRONGYLOSOMA. 



P. ERUCA. 



P. brunneus ? robustus ; antennis brevibus, pilosis, baud clavatis ; scutis 

 subrude punctatis ; pedibus parvis, gracillibus, modice hirsutis. 



Judging from our badly preserved alcoholic specimens, the color of this spe- 

 cies is reddish brown, with the side plates a lighter color. The body is very 

 robust The head has a median furrow on its vertex, and its lower border 

 emarginate. The side plates have but the posterior angles, which are acute. 



[Jan. 



