14 Mr. Pascoe's Bevision 



is apparent J dividing the middle groove into two parts.* 

 The rostrum has always three carinas on its dorsal sur- 

 face, the middle one terminating in the triangular basal 

 plate ; the scrobes also are bounded beneath by a carina, 

 but none of the characters of the rostrum afford anything 

 peculiar. The only exception to the general form of the 

 eyes occurs in Catasarcus carbo, where, instead of being 

 " oval, subdepressed, and acuminate inferiorly," they are 

 perfectly round and prominent. The only part of the 

 antennjB requiring notice is the funicle. In this the first 

 joint is generally by far the longest, but in some species 

 the second is nearly as long ; the third and follo\\ang joints 

 are usually only about half as long again as their breadth, 

 but in two or three species this proportion is very consi- 

 derably exceeded. 



The prothorax is always transverse, and marked by two 

 transverse grooves, which generally divide it into three 

 equal parts; the grooves are, however, in some cases very 

 slight. 



But the best characters of the species are afforded 

 by the elytra, only, though these are obvious enough 

 to the eye when compared with one another, they 

 are extremely difficult to define ; the sculpture is 

 nearly always of the same type, sei-iate- or sulcate- 

 punctate, with tubercular elevations between; its pecu- 

 liarities often masked by a covering of scales, the 

 absence of which, in worn individuals, serves to throw a 

 doubt on their identity. More than half the species 

 have the elytra armed vnth spines, comparatively of very 

 large size; these are generally four in number, exclusive 

 of the '' spiniform tubercle " (post-humeral spine) , 

 placed a short distance behind the shoulder, which is 

 common to the whole genus. The first pair (median) are 

 generally near the middle of the elytra, calculating the 

 middle from a line extending over the length of the 

 back, the second (posterior) a little behind them, and 

 invariably nearer the suture. Another set of species has 

 an additional pair of spines near the base, these have 

 always a smaller pair placed a little outside the median 

 (modilatoral) . ]iut in Catasarcus concretus, we find these 

 medilateral spines without the basal. 



The legs and under surface of the body are very 

 homogeneous ; the former are most commonly of a reddish 



* I doubt, however, whether this line is always present in the same 

 species. 



