1 909] Ceophilidae and Lithobiidae 1 7 9 



this form, 1 rcscr\-e judgment as to whether georgianus and per- 

 foratus may not represent such until opportunity shall present 

 of examining more material or the types. 



9. Geophilusattenuatusunastersubsp. no v. PI. XXV, figs. 4, 5, 6. 



Widest anteriorly, strongly narrowing caudad over last fourth of 

 length. 



General color clear yellow; head darker, chestnut over a transverse 

 area back of frontal region. Antennae uniform vellow. Legs pale 

 yellow. Venter scarcely paler than dorsum. 



Antennae short, strongly attenuated from base distad. Uniformlv 

 covered with fine short hairs. Last article at apex roundly conical, 

 long, shorter than the two preceding articles together. 



Cephalic plate longer than wide (5.2:4) ; sides straight and subpar- 

 allel, gradually rounding in to anterior margin, a small but distinct 

 angular process on each side ectad of base of antenna, widely shallowlv 

 emarginate between bases of antennae; posterior margin slightlv 

 excurved; plate marked with two longitudinal, diverging sulci in front 

 of posterior margin; with sparse, short hairs, scarcelv punctate. Basal 

 plate essentially free but prebasal plate not showing; not fulh' two 

 and a half times wider than long. 



Claws of prehensorial feet when closed extending beyond the distal 

 end of the first antennal article. Claw at base with an acute tooth; 

 femur near upper inner angle with a stout blunt tooth, each femur 

 bulging mesad conspicuously adjacent to presternum. Presternum 

 wider than long in ratio of 5.3:4.7; impressed with a longitudinal 

 inedian line; smooth. 



Dorsal scuta bisulcate as usual; mostly smooth. Anterior prae- 

 scuta short, very gradually increasing in length caudad ; moderate in 

 a few segments behind middle, becoming again short posteriorlv. 



First spiracle large, vertically broadly elliptical, a few following of 

 the same shape, gradually becoming circular caudad; decreasing in 

 size from the second caudad, in the posterior region becoming verv 

 small. 



Ventral pores in a median longitudinal, lanceolate or ovate area 

 which extends from the posterior margin cephalad and reaches to or 

 extends considerably beyond the middle, the area on the anterior seg- 

 ments more or less sharply demarked but more indefiniteh- limited 

 in posterior segments. 



Last ventral plate wide, attenuated caudad; each side emarginate 

 a little below middle, rounded each side of the emargination, the pos- 

 terior margin being similarly emarginate mesally. Pleurae moderatelv 

 enlarged, each with two large pits at the edge of and partly covered 

 by the last ventral plate. 



Anal pores evident. 



Pairs of legs 03. 



Length 44 mm.; width 1.4 mm.; length of antennae 4 mm. 



Locality — Austin, Texas (Prof. J. H. Comstock) ; Louisiana. 



