86 COLEOPTERA OF NORTH AMERICA. 



Sub-Family I.— CLAVIGERINAE. 



This sub-family is represeutcd in our fauna, thus far, by two 

 genera, found in ants' nests: both have but two-jointed autenntie, 

 and the outer joint is indistinctly aunulated in Fustiger. 



Eyes wauting. Adranes. 



Eyes present. Fustiger. 



The genera of this sub-family have the head narrow, and the 

 palpi rudimentary, of but one joint; the three anterior dorsal 

 segments are connate, and deeply excavated, forming a large 

 cavity, at the sides of which, and at the external apical angle 

 of the elytra, are tufts of hair. The ants which support these 

 insects, by caressing these tufts of hair with their antennie 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.— PSELAPHINAE. 



In these the abdominal segments ai'e 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 Ceopliyllus are composed of equal globular joints. 



Two tribes are indicated, as follows: — 



Posterior coxffi transverse, not prominent, not contiguous. . Pselapuini. 

 Posterior coxse conical, prominent, contiguous. Eoplectini. 



Tribe I.— PSELAPHIXI. 



These species are always narrowed in front, and have the 

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

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

 phylinidse, of the tribe Oxytelini. The form of the hind coxaj at 

 once distinguishes them from the next tribe. The second joint 

 of the tarsi is always long. 



According to the insertion of the antennae, this tribe is divided 

 into two groups : — 



Antennce inserted on two approximate tubercles. Pselaphi. 



Antenna; distant, inserted at tlie side of the bead. Bryaxks. 



