208 SEEEICOKNIA. 



Closely allied to the North -American T. alienus, but differs in the form of the 

 thorax and by the short carina of the hind angles. There is also no deep subhumeral 

 depression of the marginal stria. 



2. Throscus trivialis. 



Reddish -brown, sparsely pubescent : eyes entire, not compressed nor invaded by the canthus ; front convex, 

 sparsely indistinctly punctate, without trace of carina ; thorax not twice as wide at the base as long, 

 sides regularly arcuately narrowed to the apex, disc feebly convex, sparsely, finely, and indistinctly punc- 

 tate, hind angles without trace of carina ; elytra distinctly striate, strise finely, not closely punctate, a 

 little more coarsely at the apex, intervals flat, extremely finely biseriately punctate ; prosternal striae entire ; 

 abdomen sparsely punctate at the sides and apex ; body beneath paler than above. 



Length 1*75 millim. 



Hub. Panama, David [Champion). 



Evidently related to the North-American T. alienus, but this has the sides of the thorax 

 rather oblique than arcuately narrowed. There is no carina in the hind angles in the 

 present species, while there is one very distinct but close to the margin in that 

 species. 



AULONOTHROSCUS. 



This name is suggested for a portion of those species which, until now, have been 

 associated with Throscus, and which differ in the presence of a deep, sharply defined 

 groove in the metasternum, beginning at the middle coxae and slightly curving outwardly, 

 terminating at the posterior angle of the metasternum. In all other respects the 

 characters are those of Throscus. The character and position of this groove are suffi- 

 ciently illustrated in a sketch published by me of Pactopus (Trans. Am. Ent. Soc. xii. 

 p. 205), which goes one step further by the presence of similar grooves on the 

 abdomen. 



To Aulonothroscus, in addition to those given below, the following North-American 

 species must be referred, viz. : T. validus, T. punctatus, T. invisus, T. constrictor, 

 T. convergens, and T. pugnax, together with several undescribed species from Brazil 

 recently examined in the collection of M. Ed. Fleutiaux. 



l. Aulonotliroscus schaumi. 



Throscus schaumii, de Bonv. Ann. Soc. Ent. Fr. I860,, p. 352, t. 8. fig. 1 \ 



Hab. Guatemala, Coban (Conradt), Senahu and Capetillo (Champion). — Brazil 1 . 



In this species the eyes are triangularly emarginate in front. The front has two 

 well-defined carinas, which converge to the base of the clypeus and then diverge along 

 the outer edge. Opposite the eye a fine carina begins, and passes from the main carina 

 into the eye. This latter de Bonvouloir describes and figures as passing across the base 

 of the clypeus, but the appearance is purely deceptive. There is sometimes present a 



