APTOPTJS. 421 



antennae slender, extending to a little beyond the humeri. Prothorax broader than long, wider at the 

 base than at the apex, the sides subparallel behind and gradually, arcuately converging from the middle 

 forwards; the hind angles short; the surface rather sparsely, finely punctate, with intermixed coarser 

 punctures ; the base with a short deep sulcus on either side. Elytra moderately elongate, much wider 

 than the prothorax, subparallel to the middle and narrowing thence to the apex, flattened on the disc, 

 the humeri rounded ; finely punctate-striate, the interstices moderately convex at the sides, flat on the 

 disc, and somewhat thickly punctured. Beneath closely, finely punctate, with distinct intermixed coarser 

 punctures on the middle of the ventral segments and on the metasternum ; fifth ventral segment sub- 

 truncate and feebly emarginate at the apex. 

 Length 12, breadth 3| millim. 



Hob. Mexico, Chiapas (Salle). 



One specimen, no doubt a female. This insect is of about the same size and build 

 as A. pruinosus. It is flattened above ; the elytra are broadly rufous at the sides, finely 

 punctate-striate, with the interstices almost flat on the disc ; the legs and antennae 

 are infuscate. In the coloration of the elytra A. rufomarginatus resembles the vittate 

 form of A. vicinus, from which it differs in many respects. The emargination of the 

 fifth ventral segment may be due to accidental circumstances. 



6. Aptopus chiriquensis. 



Moderately elongate, robust, shining, somewhat sparsely clothed with yellowish-cinereous pubescence ; pitchy- 

 black, piceous, brown, or reddish-brown, the antennas and legs ferruginous. Head somewhat sparsely, 

 finely punctate ; antennae slender, about half the length of the body in the male, shorter in the female. 

 Prothorax considerably broader than long in both sexes, wider at the base than at the apex, moderately 

 rounded at the sides, the latter feebly sinuate behind ; the hind angles rather short ; the surface sparsely, 

 finely, unequally punctate, the punctuation becoming excessively fine towards the base ; the base with 

 a short sulcus on either side. Elytra moderately long, much wider than the prothorax, slightly rounded 

 at the sides, narrowing from about the basal third to the apex ; deeply punctate-striate, the interstices 

 convex and sparsely punctate. Beneath closely, finely punctate, the metasternum with a few intermixed 

 coarser punctures. 



Length 8|-9|, breadth 2f-3 millim. ( 6 2 ■) 



Hob. Costa Rica ( Van Patten) ; Panama, Volcan de Chiriqui (Champion). 



Found in plenty by myself in Chiriqui. This insect resembles A. pruinosus, 

 A. collaris, &c, from which it differs in having the head and thorax more sparsely 

 punctured, the elytra less parallel, and the pubescence sparser. 



7. Aptopus vicinus. (Tab. XIX. fig. 8, d .) 



Moderately elongate, rather narrow, shining, somewhat sparsely pubescent; pitchy-black, piceous, or brown ; 

 the antennae and legs ferruginous. Head rather sparsely punctate ; antennae slender, half or more than 

 half the length of the body in the male, shorter in the female. Prothorax in the male very little wider 

 at the base than at the apex, and nearly as long as broad, shorter in the female, moderately rounded at 

 the sides, the latter feebly sinuate behind ; the hind angles rather short ; the surface somewhat closely, 

 finely, unequally punctate ; the base with a deep sulcus on either side. Elytra moderately long, much 

 wider than the prothorax, slightly rounded at the sides, gradually narrowing from about the basal third 

 to the apex ; deeply punctate-striate, the interstices convex and sparsely punctate. Beneath closely, 

 finely punctate, the metasternum with a few intermixed coarser punctures. 



Var. ? The elytra with a broad submarginal rufous or fulvous vitta extending from the shoulder to the apex. 



Length 6f-9, breadth 2-2J millim. {6 2-) 



