56 C0LE0PTERA OF NORTH AMERICA. 



insects, by caressing these tufts of hair with their antennae cause 

 the exudation of a fluid, which they greedily swallow. The first 

 and second joints of the tarsi are very short; the third is long, 

 with a single claw. 



Sub-Family II.— PSELAPHIDAE (genuini). 



In these the abdominal segments are all separate, and the 

 antennae have eleven distinct joints, except in certain species of 

 Bryaxis, where but ten joints exist; they are usually gradually 

 clavate, but in Ceophyllus are composed of equal globular joints. 



Two tribes are indicated, as follows : — 



Posterior coxae transverse, not prominent, not contiguous. Pselaphini. 

 Posterior coxae conical, prominent, contiguous. Euplectini. 



Tribe I.— PSELAPHINI. 



These species are always narrowed in front, and have the cha- 

 racteristic form of this family, while those of the next tribe are 

 slender, linear, and frequently depressed, so as to resemble Sta- 

 phylinidae, of the tribe Oxytelini. The form of the hind coxae at 

 once distinguishes them from the next tribe. The second joint 

 of the tarsi is always long. 



According to the insertion of the antennae, I divide this tribe 

 into two groups : — 



Antennae inserted on two approximate tubercles. Pselaphi. 



Antennae distant, inserted at the side of the head. Bkyaxes. 



Group. I. — Pselaphi. 



In this group the antennae are approximate, and inserted under 

 a large frontal elevation, which is channelled. The abdomen is 

 strongly margined. 



Tarsi with ungues two, equal ; 

 Antennae moniliform ; 

 Maxillary palpi with the last two joints very transverse and lamelli- 

 forrn. Ceophyllus. 



Antennae clavate ; last joints gradually larger ; 



Maxillary palpi with the third joint transverse, triangular ; the fourth 



larger, convex. Cedius. 



Maxillary palpi with lateral setiform appendages ; 



Last joint lunate ; abdomen carinate. Tjiesiphokus. 



