654 PROCEEDINGS OF THE ACADEMY OF [Sept., 



b. — Prebasal plate not exposed. 



a'. — Ventral pores not existing on segments beyond the 28th; 



pleural pores absent, europcBus Attems. 



b'. — Ventral pores on all plates from the first to the penult ; pleural 

 pores present, plusiodontus Attems. 



The specimens of montereus examined are, in alcohol, light brown 

 anteriorly and pale yellow posteriorly, the head being brown with the 

 frontal region lighter. The color seems to have faded in the alcohol 

 and in life was probably reddish. 



The two individuals have respectively 59 and 61 pairs of legs. They 

 are very gradually though conspicuously attenuated anteriorly, and 

 strongly and rapidly attenuated posteriorly. 



The cephalic plate is longer than wdde (6.4: 5.8) ; sides nearly straight 

 and but slightly converging caudad; the posterior angles well rounded; 

 posterior border truncate, not mesally at all incurved. 



Antennae moderate, the ultimate article distinctly shorter than the 

 two preceding together (1.5 : 2). 



Ventral pores and last ventral plate nearly as in americanus. 



Length of larger specimen 48 mm. 



Locality. — Pacific Grove, Bay of Monterey, California. 



Geophilus regnans sp. nov. 



Light brown, paler posteriori}^ Body wide anteriorly, attenuated 

 gradually posteriorly. 



Head large. 



Cephalic plate attenuated in front of middle ; anterior border broadly 

 triangular; sides behind straight and subparallel; posterior margin 

 wide, a little incurved mesally. Frontal plate coalesced. Prebasal 

 plate exposed at the middle, the basal plate being a little covered by 

 the cephalic laterally. Basal plate thrice wider than long. 



Claws of prehensorial feet when closed not attaining the front margin 

 of head ; presternum in front widely angularly emarginate, unarmed ; 

 all joints and the claw unarmed. 



Antennae very short, subsparsely pilose; the ultimate article about 

 equalling in length the two preceding together. 



Sulci of dorsal scuta not deep. 



Anterior spiracles oval, oblique, the first few large, the others gradu- 

 ally decreasing; median and posterior spiracles circular, small. 



Last ventral plate very wide, its sides convexly curving, moderately 

 converging posteriorly; posterior margin wide, gently incurved. Last 

 pleurae moderate in size; pores entirely covered by the ventral plate, 

 few, small. 



