1872.} 261 
shoulders are not hooked in P, Jphis, although they project. The 
hind femora in the male project considerably beyond the apex of the 
elytra, whilst in the female they do not reach to the apex. 
The three species described by Mr. White are all undeveloped 
males. The great development of Pr. cacicus is described hereatter, 
and presents the same differences from the minor variety as are exhi- 
bited in the larger and smaller specimens of Pr. Buckleyi. 
The following table will serve to distinguish the species at present 
known :— 
PWEDE TOA-DFOWN. occ. sc ce cscs oe cous cece ce weeane cous ce Dis COCUCUSS 
B. Legs pitchy-black. 
a. Elytra strongly rugose at the base, finely granulose 
SUVUNOIAPOR? ds cree sctestsleieieinimicisaiear ee scare ALY Se 
b. Elytra uniformly strongly rugose. 
* Abdomen sparsely and not strongly punctured ; 
humeral angles of elytra not spinose. ... .... Pr. Iphis. 
** Abdomen somewhat thickly and very strongly 
punctured; humeral angles of elytra spinose.. Pr. Buckleyi. 
Prionocatus BucKLEYI, sp. nov. 
Niger, sub-nitidus, fortiter rugosus ; elytrorum angulis humeralibus 
fortiter spinosis; tibiis, tarsis, palpisque piceis; abdomine fortiter 
punetato. Long. 28 lin. 
Hab.: Ecuador (Yerba buena). Brit. Mus. 
é. Head quadrate, strongly rngose, with a strong tooth-like projection behind 
the eyes ; forehead flattened, limited on each side by a ridge which runs from the 
base of the antenna to the crown of the head, a very deep transverse impression in 
front of the base of the antenn joined in the centre by a short lougitudinal groove 
on the forehead, both the groove and the impression less punctured and more 
shining than the rest of the head; the clypeus concave, almost impunctate ; labrum 
narrow, transverse, deeply emarginate, smooth, but with a row of punctures along 
the anterior margin ; mandibles about equal in length to the head, bowed, deeply 
punctured, except at the apex; the apex of the left mandible securiform, with the 
dilated part preceded by a blunt tooth on the inside; right mandible acuminate, 
with a strong triangular tooth on the inside. Antenna about equal in length to the 
body, the 1st joint large, strongly rugose, the 2nd to 7th joints sparingly but strongly 
punctured, the 8th to the 11th joints opaque, and longitudinally quinqne-sulcate. 
Thorax transverse, rather more than twice as broad as long, convex, the sides 
strongly tri-spinose, the anterior spine the shortest; behind the third spine the 
sides are obliquely contracted to the base, the posterior angles prominent, denti- 
form; the dise is flat; the margins broadly depressed ; the whole surface roughly 
