BY THE REV. T. BLACKBURN. 133 



granulate) antice latiori nee parallelo hand vel vix pone 

 medium prothoracis retroisum manifesto, elytds postice valde 

 perpendiculari, sutura ad partis declivis basin magis fortiter 

 magis abrupte tuberculato-carinata. 

 Maris tibiis anticis sat elongatis sat gracilibus eequaliter sub- 



fortiter curvatis. 

 Feminse tibiis anticis minus elongatis minus gracilibus subrectis 

 vel potius intus vix bisinuatis. [Long. 7-8, lat. 2|-3 lines. 



Another member of the group of which A. triberculatus, Gyll., 

 may be considered the type, and scarcely differing from that 

 species except in its smaller size and in the characters specified 

 above. The front tibiae of the only sex I possess of A. tuherculatus 

 (the male, I believe) are unlike those of either sex of this species, 

 being straight on the external margin, and having the internal 

 margin rather deeply concave in its apical half. The prothorax 

 is not at all canaliculate, but its whole surface is evenly convex 

 except that it has a light transverse depression immediately behind 

 the front margin ; the tubercles, however, with which its general 

 surface is clothed much as in A. tuherculatus, are wanting on a 

 small vaguely defined space occupying the front half of the middle 

 line. The scutellum is conspicuously clothed with white scales. 

 The most striking character of the species is the extreme abruptness 

 of the apical declivity of the elytra. If the insect be regaided 

 from the side it is seen that the apex of the elytra does not 

 protrude hindward at all further than does the summit of the 

 apical declivity, and the hind outline of the elytra [i.e., the line 

 (as viewed from the side) connecting the summit of the apical 

 declivity and the apex itself] appears concave. The tuberculation 

 of the elytra is variable, in some male examples being almost 

 exactly as in A. tuherculatus, while in others and in most females 

 it is feebler and tending to run into interrupted costae. In very 

 fresh examples the squamosity looks like a dusty brown indu- 

 mentum and renders the surface opaque, while abraded specimens 

 have a subnitid appearance. From A. horrens, Gyll., this species 

 differs inter alia by its non-canaliculate prothorax, from seriatus, 

 Boisd., (which has elytra considerably, though less abruptly. 



