430 bulletin: museum of comparative zoology. 



Ventral pores in a transverse band along caudal border; ventral 

 plates with a median longitudinal sulcus. 



Last ventral plate, very wide, cephalic and caudal margins straight, 

 the lateral weakly excurved and strongly converging caudad. Coxo- 

 pleurae inflated; with a few pores of moderate size or large arranged 

 close to edge of ventral plate and partly covered by it, in the speci- 

 men being described in one series, but sometimes in two. 



Anal pores present, of moderate size, covered from ventral view. 



Anal legs ending in a long claw; in the female proportionately 

 rather slender, but decidedly thicker and longer than the penult 

 pair. Anal legs of male strongly and clavately crassate, its ultimate 

 article abruptly conical, short; densely clothed with fine hairs. 



Pairs of legs in female 81 ; in male 77. 



Localities. — Johnson City (and also Beaver Creek and Mossy 

 Creek seq. Bollman), Tenn. 



The description above is chiefly that of a partly grown female. 

 Several other specimens were subsequently found in the collection. 



SOGONIDAE, fam. nov 



The two genera for which the present family is established possess 

 in common the following more important characteristics: — 



Antennae flattened, conspicuously attenuated distad. Head small 

 or medium in size, leaving the prehensorial feet partly exposed from 

 above. 



Mandible without dentate lamellae; with a single pectinate lamella. 



Labrum of a single piece apparently, free laterally but fused in 

 middle; free margin as a whole concave, the mesial portion a little 

 convex, fringed with a row of long spines or teeth. 



First maxillae with coxae completely fused; inner and outer 

 branches set off by a suture, the outer biarticulate and with mem- 

 branous lappets. 



Second maxillae with coxae completely fused; palpus ending in a 

 simple claw. 



Chitinous lines of presternum strongly developed. 



Ventral pores in a narrow transverse band a little caudad of 

 middle of anterior sterna. 



Suprascutella absent. 



Anal legs five or six jointed; lacking claws. 



The two genera as at present known may readily be separated as 

 follows : 



