Horn.! 



OPHRYASTINI. 



40 



pointed. Thorax oval, usually broader than long, sides moderately arcuate, 

 apex and base truncate, lobes very short and slightly fimbriate. Scutellum 

 small, scarcely entering between the elytra. Elytra oval or oblong oval, 

 base not broader than the thorax, feebly emarginate, humeri feebly rec- 

 tangular or entirely obliterated. Metasternum short, side pieces moderately 

 wide, suture distinct in its entire length. Intercoxal process moderate 

 truncate in front. Tibite mucronate at tip, articular surfoces of hind tibiae 

 feebly cavernous. Tarsi normal. Body above densely scaly and with 

 extremely short black setae in some species, and moderately long hairs in 

 others. 



This genus is a part of that included by Dr. Leconte in DyslobuH, the 

 generic description of which appears to have been made from D. segnis and 

 A. granicollis of the present genus. I have retained the name Bi/slobus 

 for the species with the first abdominal suture straight as this character is 

 the most important and striking in the description. Regarding the position 

 the genus should occupy in the groups indicated by Lacordaire, I am in 

 some doubt. The scrobes are lateral, feebly arcuate and directed toward 

 the lower front of the eye. They do not become rapidly inferior as in 

 sevei'al genera already noted, and are but slightly less arcuate and less de 

 fined than in Panscojnis. 



For the present, I prefer to retain Amnesia in the present group as one 

 of the leads toward the PhytoscapM to which the next genus probably 

 belongs, Nodieles in turn being a lead toward the Eremnini. 

 I consider (Byslobus) granicollis Lee. the type of the genus. 

 The following table will make our species easily known : 

 Hairs of the surface, especially on the elytra, very short and incon- 

 spicuous. Humeri rectangular, anterior tibiae 

 moderately denticulate. 

 Body beneath rather sparsely and not coarsely 



punctured granicollis. 



Body beneath with coarse deep punctures, 

 denser on the intercoxal process and last ven- 

 tral segment decorata. 



Hairs of surface very distinct, usiially rather long. 

 Humeri rectangular, anterior tibiae moderately 

 denticulate. 



Surface of thorax even, not granulate ursina. 



Surface of thorax granulate, each granule punc- 

 tured rauca. 



Humeri obliterated, anterior tibiae feebly dentic- 

 ulate, surface of thorax with punctured granules. 

 Elytra oval, wider at middle than the thorax, 

 and not twice as long as wide. 

 Thorax not narrowed in front, granules incon- 

 spicuous, surface densely scaly ; elytra with 

 cinereous scales alternata. 



PROC. AMER. PHILOS. SOC. XV. 96. G 



