AMERICAN COLEOPTERA. 271 



and by that means a little experience will enable one to separate them, 

 but this is difficult to communicate by description. 



Occurs in Michigan, Tennessee and District of Columbia. 



C dentiltiim Lee. — Oblong-oval, very little more obtuse in front, piceous 

 to rufous, surface finely pubescent. Head rather coarsely and densely punc- 

 tured. Antentise attaining the middle of the thorax, basal joints rufous, club 

 darker, the latter of four joints the terminal narrower and obtuse at tip. 

 Thorax about one-fourth wider at base than long, sides arcuate, gradually 

 narrowing to the front, base truncate, hind angles rounded, surface very 

 densely punctate. Elytra as wide as the thorax at base, arcuately narrowing 

 to the apex, sutural stria finely impressed becoming obsolete near the base, 

 surface densely submuricately punctate, punctures less dense and a little coarser 

 than those of the thorax. Body beneath moderately densely puactulate. Legs 

 more sparsely punctulate. Length .06 — .08 inch; 1.5 — 2 mm. 



Male. — Anterior tarsi dilated, the tibiae broader at tip, slightly sinuate on the 

 inner side, the outer apical angle acute, the spurs slightly lobed at the sides. 

 Posterior femora with a small acute tooth at middle arising from the anterior 

 margin, the tibise straight and simple. The spurs of the middle and posterior 

 tibiae are slightly broader from base to middle, the tarsi slender but slightly 

 compressed. (PI. VI, fig. 11). 



Female. — Tarsi and spurs simple. Posterior femora without tooth. Anterior 

 tibiae slender. (Cab. Ulke). 



On the elytra may be seen very faint traces of striae near the base, 

 and in the female above-mentioned the sutural stria extends to basal 

 margin but is extremely fine. 



Occurs in New York and Pennsylvania. 



C. celatuin n. sp. — Oblong-oval, not broader in front, subdepressed, fer- 

 ruginous, feebly shining, sparsely pubescent. Head finely punctulate. Antennae 

 paler at base, the club darker, the latter four-jointed, the terminal joint longer 

 than the preceding, obtuse at tip and paler. Thorax nearly one-half wider 

 than long, sides moderately arcuate and gradually narrowed to tip, base 

 truncate, hind angles rounded, surface finely but rather sparsely punctulate. 

 Elytra as wide as the thorax, sides moderately arcuate, sutural stria entire but 

 very fine near the base, surface moderately densely punctured, more densely 

 and a little more coarsely than the thorax. Abdomen finely not densely punctu- 

 late, sides of metasternum more coarsely punctate. Length .08 inch; 2 mm. 



Male. — Anterior tibia rather strongly arcuate, broader at tip, the spurs lobed 

 at the sides, the tarsi dilated. Middle and posterior tibiae straight, the tarsi 

 slender, slightly compressed. Posterior femur with a triangular acute tooth 

 near the middle arising from the inner edge. (PI. VI, fig. 12). 



Female. — Unknown. 



This species resembles nevadense of the next series so greatly that 

 it might easily be placed with it without detection except Wthe male 

 characters. It also resembles dentafnni in form but is more depressed. 

 This species seems to be our equivalent for the European Delarouzei. 

 One specimen, western Nevada, (Morrison). 



