Chamberlin — North American Spiders of Gnaphosidae. 147 



d. Upper margin of furrow of chelicera unarmed, or with a 

 keel, or with three serrations or teeth, rarely more 

 (Nodocion only), the lower margin unarmed or with 

 but a single tooth or nodule; bulb of male palpus with 

 no apophyses, at most with one or several small teeth 

 near base of embolus, 

 e. Posterior row of eyes more or less recurved. 



f. Tibia III with a median dorsal spine; carapace 



without distinct median iurToyv.....Sergiolus Simon, 

 ff. Tibia III with no median dorsal spine; carapace 

 with a distinct median furrow. 



Poedlochroa Westring. 

 ee. Posterior row of eyes more or less procurved, or some- 

 times straight, 

 f. Lower margin of furrow of chelicera with one 

 tooth or nodule; anterior median eyes usually 

 as large as or larger than the laterals, 

 g. Clypeus twice as high, or more, as the diameter 

 of an anterior eye; posterior median eyes 

 much farther from each other than from the 

 laterals; body with two black longitudinal 

 stripes over both carapace and abdomen. 



Cesonia Simon. 



gg. Clypeus obviously lower; posterior median 



eyes not at all or but little farther from 



each other than from the laterals; body 



with no such black stripes above. 



h. Eyes of posterior row typically nearly 



equidistant, the medians always well 



separated from each other and smaller 



than or at most as large as the laterals. 



Herpylliis Hentz. 

 hh. Posterior median eyes close together and 

 obviously larger than the laterals. 



Litopyllus, gen. nov. 

 ff. Lower margin of furrow of chelicera smooth, 

 wholly unarmed; anterior median eyes usually 

 obviously smaller than the laterals. 



Nodocion. gen. nov. 

 dd. Upper margin of furrow of chelicera with from three to six 

 distinct teeth, the lower margin with two or three, or 

 rarely with only one ; bulb of male palpus with one or 

 more apophyses. 

 e. Upper margin of furrow of chelicera with three teeth, 

 the lower with two, all well developed, 

 f . Posterior median eyes large and oblique, typically 

 close together but well removed from the 

 laterals; epigynum in female with a prominent 



