NATURAL SCIENCES OF PHILADELPHIA. 357 



Elytra with denuded spots or bands : 

 Feet black : 



Thorax wider than long, narrowed in front : 



Elytra with denuded fasciae 1. Mo t s ch u Is k i i. 



Elytra with denuded spots 2. interruptus. 



Thorax not wider than long: 

 Pubescence long: 



Bands of elytra angulated 3. canescens. 



Bands of elytra transverse 4. difficilis. 



Pubescence very short, denuded spots 



indistinct 5. r o t u n d i c o 1 1 i s. 



Feet testaceous 6. 1 u t e i p e s. 



Elytra uniformly pubescent, without denuded spots : 

 Feet black; thorax not transverse : 



Pubescence fine and short 7. obscurellus. 



Pubescence long and dense 8. senilis. 



1. L. M o t s c h u 1 sk i i, elongatus, aeneo-niger, pilis pallidis longis seri- 

 ceis irregulariter vestitus, maculis denudatis variegatus, thorace latitudine 

 breviore, antrorsum angustato, apice truncato, lateribus valde rotundatis ser- 

 ratis, basi fortiter rotundata; elytris thorace vix latioribus fortiter punctatis, 

 transversim subrugosis, fasciis curvatis denudatis ornatis ; antennis pedibus- 

 que nigris. Long. 4 ram. 



Dasytes canescens\ Lee. Proc. Acad. Nat. Sc. Phila., vi. 170. 



Middle California, abundant; Oregon. I take pleasure in naming this 

 species after Col. Motschulsky, who has mentioned, Bull. Mosc. 1859, 391, the 

 error I committed in referring it to the species described by Manuerheim. It 

 differs by the more robust form, larger size, more transverse thorax and more 

 densely punctured elytra. 



In the male the sixth ventral segment is prominent, but not excavated, the 

 fifth is not excavated. In the female the sixth ventral segment is not visible. 



2. L. interruptus, elongatus aeneo-niger, pilis pallidis longis sericeis 

 irregulariter vestitus, thorace latitudine paulo breviore, antrorsum angustato, 

 apice truncato, lateribus valde rotundatis serratis, basi fortiter rotundata; 

 elytris thorace paulo latioribus, fortiter punctatis, transversim subrugosis, 

 fasciis denudatis interruptis ornatis; antennis pedibusque nigris, illis articulo 

 2ndo piceo. Long. 3-75 mm. 



One pair, Nebraska, Mr. Ulke ; one specimen, Santa Cruz Island, Califor- 

 nia, Mr. C. M. Bache. I should hesitate to consider this as distinct from the 

 preceding, but for the sexual characters. The fifth ventral segment of the 

 male is broadly emarginate, clothed behind with velvety black hairs, and the 

 sixth segment is prominent and concave. 



The only differences I can find between this and L. Motschulskii are : 

 the thorax is a little more convex and less transverse, the elytra comparatively 

 a little wider, and the denuded fasciae are interruptsd so as to form spots ; 

 and the second joint of the antennae is piceous. 



3. L. canescens Motsch., Bull. Mosc. 1859, ii. 391. Dasytes can. Mann., 

 Bull. Mosc. 1843, 247. 



.Middle California ; for authentic types of this species I am indebted to Col. 

 Motschulsky. The thorax is nearly round, serrate on the sides, the denuded 

 bands of the elytra are not interrupted into spots, and the antennas are 

 entirely black. The fifth ventral segment of the male is deeply excavated, 

 emarginate and clothed behind with black velvety hair, the sixth segment is 

 prominent and concave The antennae are described by Mannerheim as rufo- 

 teslaceous at base, but they are entirely black in the specimens sent by Col. 

 Motschulsky. 



1866.] 



