1 78 Annals Entomological Society of America [Vol.11, 



with a short, inconspicuous palpal process; the second article of the 

 outer process with a similar palpus which is in a sub-dorsal position 

 and hence difficult to see. Claw of the palpus of second maxillae 

 large, smooth. 



Claws of the prehensorial feet when closed attaining or nearly at- 

 taining the front margin of the head ; without chitinous lines ; unarmed ; 

 front margin of pre-sternum widely though but weakly incurved, not 

 mesally emarginate, twice as wide as greatest length, or a little wider. 



Anterior and posterior dorsal scuta smooth, entirely unfurrowed, 

 the median scuta somewhat widely depressed each side of middle. 

 Anterior praescuta very short, becoming caudad gradually longer 

 until nearly half as long as the scuta. 



Ventral plates all smooth and even, unfurrowed and without de- 

 })ressions. Porigerous area transversely elliptical or oblong, in anter- 

 ior and middle parts of body sharplv demarked and somewhat de- 

 pressed, the lateral portions sometimes more or less bent caudad, in 

 posterior region becoming more indistinctly defined. 



First spiracle large, vertically narrow elliptical, those following cir- 

 cular, gradually decreasing in size caudad. 



The first pair of legs decidedly shorter and more slender than the 

 second. Ultimate pair of legs six jointed, not crassate and without 

 a claw. 



Last ventral plate narrowed caudacT, the sides slightly incurved; 

 posterior margin nearly straight ; anterior margin extending forward 

 from each side to the middle line, the border being thus sub-triangular; 

 with a median longitudinal impression. Pleurae with exceedingly 

 numerous small pores over entire surface, ventral, lateral and dorsal, 

 some of the ventral pores being covered bv the last ventral plate. 



Pairs of legs, 97. 



Length 102 mm.; greatest width .') mm. 



Locality — McKendrick, Idaho. 

 8. Geophilus bipuncticeps Wood. 



]8()"_'. Geophilus bi])uncticeps, Wood, J. Acad. Sci. Phil. V, p. 4.5. 



1865. Geophilus bipuncticeps, Wood, Tr. Am. Phil. Soc, XIII, p. 180. 



1886. Geophilus georgianus, Meinert, Proc. Am. Phil. Soc. XXIII, p. 218. 



1887. Geophilus perforatus McNeil, Proc. U. S. N. M., p. 325. 

 1893. Geophilus attenuatus, Bollman, Bull. U. S. N. M., 46, p. 148. 



Specimens from Columbus, Ohio, and from Washington, 

 D. C. These ha\e the ventral pores in a transverse band the 

 anterior margin of which is straight, but the area extends caudad 

 at middle on some plates, making the posterior portion subtri- 

 angular. The antennae are long, agreeing essentially with Mei- 

 nert's description for geogianus, which is at most a subspecies 

 of the one under consideration. Bollman, who had McNeil's 

 type, regards perforatus as a s^^nonym. Because of a seemingly 

 strong tendency for the formation of geographical varieties in 



