276 THE CANADIAN ENTOMOLOGIST. 



A. gracilis, n. sp. — -Rufo-testaceous, very elongate, pubescence 

 excessively short, sparse and indistinct. Head and thorax opaque, elytra 

 moderately shining. Antennae nearly attaining the middle of the elytra, 

 slender, filiform ; fourth joint about three times as long as wide ; eleventh 

 about three-fourths as long as the tenth, the latter not at all obconical. 

 Eyes very large, separated beneath by a distance which is scarcely equal 

 to the length of the second antennal joint. Prothorax a little transverse, 



sides straight and parallel in basal three-fourths, just perceptibly sinuate 

 before the hind angles, which are right and sharply defined ; disc not 

 impressed at middle, feebly flattened at sides posteriorly. Elytra fully 

 one-half wider and four times as long as the prothorax ; sculpture of 

 surface nearly as in nitidipennis, except that the elytra are more closely 

 punctate, the punctures separated on the average by little more than their 

 own diameters, while in nitidipeniiis they are distant from two to three 

 times their own diameters. Lower surface and legs nearly as in 

 iiitidipennis. 



Length, 7 mm.; width, 2 mm. 



Described from a single male specimen taken by Professor Snow in 

 Oak Creek Canon (elevation, 6,000 ft.), Arizona. 



The principal differences mentioned above are summarized in the 

 following table : 



Eyes small, very slightly more prominent than the sides of the front, 

 separated beneath by a distance which is about three times the 

 length of the second antennal joint ; fourth joint of antennae barely 

 twice as long as wide pallidus. 



Eyes much larger ; much more prominent than the sides of the front ; 

 fourth joint of antennae three to four times as long as wide. 



Eyes separated beneath by a distance which is nearly twice the length 

 of the second antennal joint ; tenth joint of antennae obconical, 

 eleventh not shorter; prothorax narrowed from the middle; elytra 

 not much wider at base than the prothorax, strongly 

 shining nitidipennis. 



Eyes separated beneath by a distance which is scarcely as great as the 

 length of th€ second antennal joint; tenth joint parallel, eleventh 

 shorter than the tenth ; elytra much wider than the prothorax at 

 base ; moderately shining gracilis. 



