AITLONOTHEOSCUS. 209 



short median carina on the front ; but in one of the three specimens before me it is not 

 present. 



The thorax has a fine but acute carina parallel with the lateral margin, not men- 

 tioned by de Bonvouloir, but shown in Migneaux's excellent figure. 



2. Aulonothroscus gradatus. 



Piceous, clothed with yellowish-cinereous pubescence, some of which along the elytral intervals is longer and 

 more erect : eyes entire but invaded by the canthus of the front ; head ferruginous, indistinctly punctate, 

 obtusely bicarinate, the carinas slightly converging to the base of the clypeus, but not continued ; thorax 

 more than twice as wide as long, sides regularly arcuate to the front, disc rather flat, sparsely punctate at 

 the middle, more closely at the sides, hind angles finely carinate ; elytra very indistinctly striate, striae 

 finely and indistinctly punctate at the base, gradually more and more coarsely and deeply to the apex, 

 intervals flat, confusedly biseriately punctate at the base, becoming uniseriate behind the middle ; 

 prosternal striae long ; abdomen sparsely punctate, pubescent ; legs brownish, tarsi testaceous. 



Length 3 millim. 



Hal. Guatemala, Quiche Mountains 7000 to 9000 feet [Champion). 



This species has entire eyes, but the canthus is prolonged over the eye as it is in 

 A. schaumi. The thorax, when examined under a high power, is quite closely 

 punctulate between the punctures observed in the usual manner. A. gradatus is not 

 especially related to any of the species described, but resembles A. schaumi in form, 

 although less broad. The prolonged canthus and elytral punctuation will readily distin- 

 guish it among those with entire eyes and bicarinate front. 



3. Aulonothroscus fraternus. 



Piceous, clothed similarly to A. gradatus : eyes entire, the canthus of the front not prolonged over them ; head 

 nearly smooth, obtusely bicarinate, the carinas short ; thorax not twice as wide at the base as long, sides 

 regularly arcuate to the apex, hind angles finely carinate, disc feebly convex, sparsely punctate over the 

 entire surface, the intervals between the punctures rather shining ; elytra not distinctly striate, the striae 

 indicated by fine distant punctures, which become quite coarse at the apical third, intervals flat, apparently 

 uniseriately irregularly punctate ; prosternal striae entire ; abdomen sparsely punctate and pubescent ; legs 

 reddish, tarsi paler. 



Length 2 millim. 



Hah. Guatemala, El Tumbador, Duenas, Guatemala city, Cubilguitz (Champion). 



An inconspicuous species, differing from A. gradatus by the more sparsely punctate 

 and smoother thorax, and the somewhat different elytral sculpture, and by the canthus 

 not being prolonged over the eye. 



biol. CENTR.-AMER., Coleopt., Vol. III. Pt. 1, November 1890. 2 E 



