232 COLEOPTERA OF NORTH AMERICA. 



Fam. L— CIOIDAE. 



Mentum trapezoidal, corneous; ligula without paraglossse; 

 palpi short, 3-jointed. 



Maxillte exposed at the base, with two flattened, ciliated 

 lobes; palpi short, ■i-jointed. 



Autenna3 inserted at the anterior margin of the eyes; 

 8-10-jointed, with the last three joints larger, forming a 

 loose.club; 11-jointed and pectinate in Rhipidandrus. 



Head with the.epistoma usually margined, but not in 

 Erhipidandrus; labrum distinct; mandibles short in our 

 genera; clypeal suture distinct; eyes rounded, somewhat 

 coarsely granulated. 



Prothorax with the lateral margin distinct; cylindrical, 

 rounded in front, and frequently prolonged over the head; 

 occasionally toothed or horned; coxal cavities small, sepa- 

 rate, narrowly closed behind. 



Mesosternum short, triangular ; side pieces scarcely ex- 

 tending to the coxas. 



Metasternum large; side pieces narrow, linear. 



Elytra entirely covering the abdomen ; epipleuras narrow. 



Abdomen with five free ventral segments, the first longer 

 than the others. 



Anterior and middle coxas oval, not prominent, without 

 trochantins ; hind ones transverse, separated. 



Legs moderately short; tibiae either dilated and serrate, 

 or linear, spurs not distinct; tarsi 4-jointed, joints 1-3 very 

 short, equal, -ith long, with simple claws. 



Very small insects, found under bark of trees, and in the dry 

 and woody species of fungus, such as Polyporus. They are usually 

 gregarious. In some of the species the head and the anterior 

 margin of the thorax are in tlie male ornamented witli horns. 



Our genera are four in number, all having the tarsi free, not 

 received in tibial grooves. 



Antennae 10-jointed, tibiae not serrate. Cis. 



Antennae 9-jointed. Ennearthron. 



Antennae 8-jointed, tibiae not serrate. Ceracis. 



Antennae 11-jointed ; joints 5-11 forming a large pectinate mass ; dytrji 

 silicate. . Rhipidandrus. 



The last two genera are not yet represented in the racific fauna. 

 Rhipidandrus Lee. has been described as Eutomus Lac, and 

 placed in ScolytidiB. It has a deceptive resemblance to Eledona. 



