51 



name " le scolite." The figure, " Planch 5, fig. 5," is poor, and although it 

 would be identified readily enough as probably belonging to the genus Scoly- 

 tus, it could not possibly be definitely connected with any particular species. 

 The genus Scolytus was erected, therefore, without any definite specific repre- 

 sentative, and in my opinion should be replaced by Eccoptogaster Herbst,1793. 



Key to the Species. 



A Elytra deeply, closely striate, interstriae as deeply impressed as the main 

 striae; the disc of the elytra distinctly hairy; epistomal process almost 

 obsolete. (Some specimens of muticus have the striae much less distinct 

 than normal). 



B Large, 3 -5 to 4 mm.; elytra sparsely clothed with long hairs over entire 

 surface. Ohio, Missouri, Pennsylvania; Celtis. muticus Say. 



BB Smaller, 2 5 to 3 mm. ; elytra with short hairs over entire surface. 



rugulosus Ratz. Page 52. 

 AA Elytral interspaces at least moderately wide and at most only feebly 



striate; disc almost glabrous. 



B Elytra with deep wide striae of coarse, very closely placed punctures. 



C Interspaces rather narrow; the interstrial rows finely impressed; the 



male with the front clothed with a fringe of long hairs, and the 



venter with four acute spines. quadrispinosus Say. Page 53. 



CC Interspaces wide; the front thickly clothed with long hairs; the 



venter without spines in either sex. Illinois, Texas; Celtis, Fagus. 



fagi Walsh. 



BB Elytral striae not very deeply impressed and with small or medium- 

 sized strial punctures separated usually by one or more times their 

 diameter. 

 C Elytral striae distinctly (and variably) impressed; the interstrial 



punctures on the disc much smaller than those of the striae. 

 D The 2nd abdominal sternite with a well-developed spine in the 

 male, and a spine or acute tooth in the female ; the anterior or 

 ventral edge of the 2nd segment rounded and feebly margined, 

 except in multistriatus. 



E The ventral declivity minutely and very densely punctured; 

 the 3rd and 4th segments together much shorter than the 

 5th, and each with a trace of a median caudal granule; the 

 spine arising from the upper part of the 2nd segment. Elm. 



*multistriatus Marsh. 



EE The ventral declivity finely and sparsely punctured; the 3rd 

 and 4th segments together subequal to the 5th, and without 

 traces of a median caudal granule ; the spine arising from 

 the centre or from the caudal margin of the 2nd segment 



F The ventral spine from the centre of the perpendicular 

 face (2nd segment) of the declivity (PI. 17, fig. 10). 



piceae Sw. Page 53. 



FF The ventral spine from the caudal fifth of the 2nd segment. 



unispinosus Lee. Page 53. 



DD The abdomen unarmed, except rarely a faint acute carina at 

 the apex of the 2nd sternite or a granule at the apex of the 

 3rd and 4th sternites. 



* Introduced into the Eastern States from Europe; not yet known from Canada. 



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