164 Journal New York Entomological Society. (Vol. \iu 



Orphilini. 



This tribe is quite as anomalous as the Trinodini, and differs from 

 any other in having the metacoxal plate well developed, almost equal 

 in length throughout the width and extending to the sides of the 

 body. The head rests in repose upon the vertical pointed plate form- 

 ing the presternum between the coxa?, and the body is glabrous. 

 The legs and head are strongly retractile, the mesosternum transverse 

 and even between the coxa; and the epipleurse well denned. We 

 have a single genus which is also palrearctic in range : — 



Orphilus Br. 



The body is compact, oblong-oval in form, moderately convex, the 

 elytra impressed along the suture except at base and with rather 

 prominent humeral callus, the prothorax at base as wide as the elytra, 

 to which it is closely fitted, the base broadly lobed in the middle. 

 The scutellum is well developed and ogival in form. The tarsi are 

 slender, glabrous, much shorter than the tibia? and the two basal 

 joints of the posterior are subequal and each rather shorter than the 

 third or fourth, which also are subequal, the fifth about as long as the 

 first three together. The antenna? are n -jointed, with a broadly oval 

 compact club composed of three transverse free joints, and the eyes 

 are emarginated by the short post-antennal sides of the front. The 

 species are rather closely allied among themselves, and those repre- 

 sented in my cabinet may be distinguished as follows : — 



Integuments deep black, without metallic lustre 2 



Integuments black, with bright steel-blue reflection 4 



2 — Elytra finely and sparsely punctured throughout, the punctures toward base separ- 

 ated by at least twice their own diameters; pronotum finely and sparsely punc- 

 tured throughout; integument highly polished. Length 3.2 mm.; width 1.8 

 mm. Arizona (Canon of the Colorado River) — Dr. Prudden..aequalis, sp. nov. 



Elytra coarsely punctate toward base, where the punctures are separated by their own 

 diameters or less 3 



3 — Punctures of the elytra toward base smaller, always clearly separated, those of the 

 pi-onotum fine but rather close-set. Length 2.8-3.5 mm.; width 1. 6-2. 1 mm. 

 California to Colorado subnitidus Lee. 



Punctures of the basal regions coarser and usually densely crowded so as to become 

 more or less distorted in form ; pronotal punctures larger and stronger but rela- 

 tively scarcely so close-set; body distinctly smaller in size. Length 2.3-2.8 

 mm.; width I.28-I.7 mm. Lake Superior to Georgia ater Er'nlis. 



4 — Nearly similar in form to ater, the elytra] punctures not so coarse or deep toward 

 base and widely isolated among themselves, the pronotal punctures very line and 

 not close-set. Length 2.8-2.9 mm.; width 1.7 mm. Idaho (Ceeur d'Alene). 



chalybeus, sp. nov. 



