1898.] ENTOMOLOGICAL NEWS. 193 



projects backward over the anal pencil; each lateral segment from two 

 to ten is produced into an oval prominence from which projects a radiating 

 fascicle of long setae similar to those forming the dorsal rows; the basal 

 area dorsally, and the ventral surface of the head are glabrous, but the 

 central-dorsal region is crossed by two transverse rows of setse, and the 

 anterior region is thickly setate; a pair of setae is usually present on the 

 occiput; anal pencil formed of two dense fascicles of long, slender, deli- 

 cately-spined hairs that terminate distally in enlarged, recurved, fimbriated 

 processes. Length of adult specimens 3.0 mm. 



Hab. — Western Washington. Usually found in damp places, 

 beneath the bark of decaying logs, in moss, under dead leaves, 

 etc. As a rule they are gregarious, and occur in colonies of 

 considerable magnitude, but so far only females have been ob- 

 served. 



STUDIES IN CEPHALOIB/E. 



By Thos. L. Casey. 



The very unexpected discovery of a remarkable divergence in 

 tarsal and ungual structure, in a specimen from Placer County, 

 California, recently sent to me by Mr. Fuchs under the name 

 Cephaloon bicolor Horn, led me to investigate the material in my 

 cabinet from a generic point of view, and to the conclusion that 

 the genus Cephaloon, as heretofore known to us, is a complex 

 of several genera having a strong family likeness among them- 

 selves. These genera may be distinguished as follows : 



Tarsi slender, the penultimate joint unmodified, the claws nearly straight, 

 arcuate at tip and pectinate within. 

 Appendage of the tarsal claws broad and obtusely rounded at apex. 

 Last joint of the maxillary palpi conical, the inner side but slightly 

 shorter than the outer, the oblique apex short and straight ; an- 

 tennas short, the last three joints broader, but not notably elon- 

 gate Cephaloon Newm. 



Last joint of the maxillary paipi with the inner side very short, the 

 apex strongly oblique and arcuate; antennae longer and slender, 

 the last three joints not notably enlarged or elongate, but differ- 

 ing in form and color from those which precede . Sponidinm n. g. 

 Appendage of the tarsal claws very slender, acutely pointed at tip; an- 

 tennae very long and slender, the last three joints greatly elon- 

 gated, but not at all broader Typitium n. g. 



Tarsi stouter and shorter, the penultimate joint quadrate, feebly bilobed 

 and densely pubescent beneath, the claws subevenly arcuate, not 

 at all pectinate within and non-appendioulate . . Drachylis n. g. 



