306 FAMILY X. PSELAPHID^. 



Brendel and Wicliham. — "The Pselaphids3 of North America, 



in BuU. Lab. Nat. Hist. Univ. loT^a, I, 1890, 216-304; II, 



1891, 1-84, pis. VI-XII. 

 Casey. — ' ' Coleopterological Notices, V and VII, ' ' in Ann. N. T. 



Acad. Nat. Sci., VII, 1893, 433-509 ; IX, 1897, 550-630. 

 Casey. — "Remarls on Some New Pselaphidse," in Can. Ent., 



XL, 1908, 257-281. 

 The family is di^'ided into two subfamilies, and these in turn 

 into tribes and genera. 



KEY TO SUBFAMILIES OF PSELAPHID^. 



a. Antennae 2- jointed (Pig. 4, No. 10, and Fig. 146, 6) ; front coxse con- 

 tiguous, liind ones distant. Subfamily I. Clavigeein^, p. 306. 

 00. Antennte 11-jointed (Fig. 146, o), rarely lO-jointed. 



Subfamily II. Pselaphin^, p. 308. 



Subfamily I. CLAVIGERINAE. 



The members of this subfamily ha^-e the head narrow; palpi 

 rudimentary, of but one joint ; three basal dorsal segments of abdo- 

 men firmly united and deeply excavated, forming a ca^'ity on the 

 sides of which are tufts of hairs; first and second tarsal joints very 

 short; thii'd long, -nith a single claw. The species live solitary in 

 ants ' nests and the construction and smallness of the mouth is such 

 that their nourishment is supposed to be liquid in form. The ants 

 caress the tufts of hairs on the abdomen of the beetle with their an- 

 tennae, causing the exudation of a fluid, which they greedily swal- 

 low. Two genera comprise the subfamily, both of which are repre- 

 sented in the State. 



KEY TO GENEBA OF CLA\'IGEBIX.E. 



a. Eyes wanting. I. Adranes. 



aa. Eyes present. II. Fustigek. 



I. Adhanes Lee. 1849. (Gr., "imbecile.") 



Of this genus only two species are known. One of these has 

 been taken in the State, -nhile the other probybly occurs. 



KEY TO SPECIES OF ADRAKES. 



o. Thorax, when viewed from above, conical ; head cylindrical ; length 



• l.S mm. ccEcus. 



00. Thorax bell-shaped ; head obconical ; length 2.5 mm. 589. lecontei. 



A. cwcus Lee, ora.nge-yellow, elytra with regular rows of short 

 recumbent, stiff hairs, is known from Pennsylvania, Georgia and Il- 

 linois. 



