I' UK AN'i'-r.()\-iNG MKK/rrj'.s. 305 



closely and nij^dsoly pmirinrcd nc-ii' Ikisc. Klylra (Hic-liair l(iiii,'<M- lliaii widi-, 

 two-thirds wider than Ihdrax. n arsciy and lalhci' sparsely iiuu<latt'. and 

 sparsely clothed with siiorl. stilt recurved liairs. Leujith 1.5 iiiiii. 



Lawrence Comity; rare. Oetolier Iti. T.-ikeii fntiii nest of red 

 ants beneath deeayins: log. 



F;nnily X. PSELAPITTI).!^.. 



TpiE Ant-i.oving Bei^.tles. 



Yery small ehestnut-brown. dull yellow or piceous species, not 

 exceeding 3.5 mm. in length, having the body usually slightly pu- 

 bescent, head and thor.ix luostly narrower than elytra and abdo- 

 men ; elytra short, truncate ; abdomen convex, obtuse at tip and 

 with half its length exposed above. They live for the most part 

 beneath bark and stones, w'here they feed upon Acarina and other 

 minute animal forms. Others excrete from small tufts of hnirs a 

 substance of which ants are very fond, and they are therefore toler- 

 ated in numbers in the nests oE these insects. They are even said 

 to be fed by the ants and to ride about on the backs of their hosts 

 when so inclined. 



The name of the family is from tli<i1 of the tA'pical genus, l*sc 

 Uiphus, meaning "I feel my way," in allusion to the greatly de- 

 veloped palpi or "feelers," the maxillary palpi being usually -4- 

 jointed. greatly developed and of a variety of remarkable forms. 



In addition to the characters mentioned the Pselaphidfe have 

 the mandibles usually broad and short, with the tips curved and 

 acute; antenna^ usually clavate, rarely bead-like, the number of 

 joints variable, but usually eleven ; eyes with coarse facets, some- 

 times wanting; prosternum almost obsolete between the front coxa?, 

 which are conical, prominent, contiguous, the cavities open behind; 

 middle coxa^ rounded, contiguous: hind ones narrow, transverse, 

 usually separated ; meta.stemum very broad, its sidepieces simple ; 

 legs long, femora often club-shaped ; tibi;e slender and without 

 spurs; tarsi usually 3- (rarely 2-) join-ted; claws simple. 



Nearly 2.500 species of Pselaphidos are known, about 275 of 

 which are from North America. The more important papers treat- 

 ing of these are as follows: 



LeConte. — "On the Pselaphidos of the United States," in Bost. 

 Journ. Nat. Hist., VI, 1849, 64-110. 



Brendel, E. — "Synopsis of the Genera and Species of the Fam- 

 ily Pselaphids." in Proc. Ent. Soc. Phil. VI. 1866. 31-38. 



