1909] Geophilidae ami Lithohiidae 183 



Last pleurae each with about twenty-five pores on ventral and lateral 

 svirfaces and a few on dorsal, the pores aggregated chiefly over cephalic 

 portion, especially in the case of those lateral and dorsal in position. 

 Two or three pores covered by dorsal plate and four or five by the ven- 

 tral. The ventral pore most caudad in position is somewhat isolated 

 from the others but is not enlarged or but slightly so. 



Anal pores present. 



Pairs of legs 01. 



Length 38 mm. Width 1.2 mm. Length of antennae I? mm. 



Locality — -Washint^^ton, D. C. 



15. Geophilus marginalis Meinert. 



1886. Geophilus marginalis, Meinert, Proc. Am. Phil. Soc, XXI, ji. 21S. 



A Specimen from Miami, Florida, collected by Prof. J. H. Com- 

 stock in 1903 agrees closely with the description of Meinert's indi- 

 vidual, which likewise came from Florida. 



16. Geophilus nasintus sp. nov. PL XXIV, figs. 7, 8, 9. 



Body gradually attenuated cephalad, more abruptly so caudad. 



General color light yellow, inclining to greyish at middle portion 

 both above and below. Head, presternum and antennae darker, uni- 

 form. 



Antennae long. Articles all long and distad of the second not 

 much differing in length. 



Cephalic plate longer than wide in the ratio of 6:4.8. Posterior 

 margin subtruncate; anterior angles widely rounded, front margin 

 rounded forward, mesally not at all emarginate; the sides weakly con- 

 vex more strongly so posteriorly ; posterior margin a little incurved ; 

 head wider behind than in front. Posterior lateral portion of cephalic 

 plate subdensely punctate somewhat less densely so over median 

 posterior portion, the punctate rather fine; frontal region almost free 

 from punetae; frontal plate not discrete. Basal plate three times as 

 wide as long, rather sparsely finely punctate. Prebasal plate not 

 exposed. 



Claws of prehensorial feet when closed attaining front margin of 

 cephalic plate. Claw and other joints entirely without teeth. Pre- 

 sternum nearly smooth. 



Dorsal scuta with rather weak lateral sulci, a median longitudinal 

 sulcus also evident on some; sulci scarcely evident on posterior seg- 

 ments. Anterior prescuta moderate in length, becoming rather long 

 in the third quarter of the body and then decreasing in size caudad. 



All spiracles round, the first large and the second abruptly smaller. 



Ultimate legs in the female long, moderately enlarged, armed with 

 a claw. 



Ventral plates or sterna with a longitudinal sulcus which is deep- 

 est at middle portion of its length, where on some segments, it is 

 crossed at right angles by a transverse sulcus. Ventral pores in a 

 transverse band adjacent to posterior margin. 



