AMERICAN COLEOPTERA. 321 



of the elytra is also more evident and the surface quite distinctly 



San Piego and Calaveras (Crotch), Owens' Valley, California. 

 Cyhocephalus? unirohr Motsch, Bull. Mosc. 1845, iv, p. 364, does 

 not belong to the genus. 



IPINI. 



Maxillse with one lobe. Labrum connate with the front, suture 

 more or less distinct. Antenna eleven-jointed, terminated by a three- 

 jointed club. Anterior coxye open behind, narrowly enclosed in 



By the one character this tribe is distinguished from all the 

 Nitidulidse. By all authors from Erichson, the labrum is said to be 

 concealed by the front, that this is not the true condition is very 

 easily seen and proved by dissection. 



The genera composing the tribe are as follows : 



Anterior coxae open behind. -n^A,, 



Thorax margined at base, slightly overlapping the base of the elytra. Body 



r^ Cryptarcha. 



pubescent ; _ 



Thorax not margined at base. Body glabrous "P** 



Anterior coxse closed behind. ».„„„„ 



Thorax not margined at base. Body glabrous PityophagUS. 



In the above arrangement Cryptarcha leads naturally to the 

 Cychramini, and Fityopha.jus to the Rhizophagidae. Cryptarcha is 

 restricted to the Atlantic region, the other two genera have repre- 

 sentatives on both sides of the continent. 



CRYPTARCHA Shuck. 



Labrum indistinct. Mandibles feebly bifid at tip. Antennal grooves 

 short, convergent. Prosternum prolonged and laminiform at tip, partly 

 concealing the mesosternum, anterior coxae open behind. Thorax 

 margined^t base. Scutellum not large. Tibiae simple, tarsi dilated, 

 claw'! simple. (PI. HI, fig- 12, «, *, c) 



The males have the tips of the elytra obliquely sinuate as in some 

 /p.s, there is no additional segment. The head is larger in the male 

 than in the female. 



Three species occur in our fauna. 

 Elytra substriately punctured, surface simply pubescent. 



Sides of thorax not explanate, of elytra very narrowly reflexed a«MPla- 



Elytra irregularly, moderately densely punctured, surface pubescent and with 

 rows of short erect setae. * • #„ 



Sides of thorax not explanate, of elytra very narrowly reflexed. ..strigata. 



Sides of thorax explanate, of elytra rather widely reflexed coiicmiia. 



„,, IAA\ OCTOBEE, 1879. 



TBAHS. AMER. ENT. SOC. VII. (,41; 



