Chamherlin — North American Spiders of Gnaphosidae. 155 



Megamtrmecion Reuss. 



Zool. Miscell., Ar., 1834, p. 217. 



Dyction Walckener, Ins. Apt. I, 1837, p. 380. 



Genotype. — M. caudatum Reuss. 



Megamyrmecion californicum Simon. 

 Ann. Soc. Ent. France, 1893, p. 308. 

 Locality. — California, southern part. 



Cesonia Simon. 

 Hist. Nat. Araign., I, 1893, p. 375. 

 Genotype. — C. bilineata (Hentz). 



Cesonia bilineata (Hentz). 



Herpyllus bilineatus Hentz, Jour. Bost. Soc. Nat. Hist., 1847, 5, p. 456; 



Spiders U. S., 1875, p. 92, pi. II, f. 5. 

 Poedlochroa bilineata Emerton, Trans. Conn. Acad., 1890, p. 11, pi. 4, f. 3. 

 Cesonia bilineata Simon, Hist. Nat. Araign., I, 1893, p. 375; Comstock, 



Spider Book, 1912, p. 320, f. 309. 



Distribution. — N. C. (type loc); Ala. and other southern states; New 

 England; Ohio; Indiana. 



LiTOPYLLTJS, gen. nov. 



AflBnities with Herpyllus but the posterior row of eyes more procurved 

 and, in particular, the median eyes of this row larger than the laterals and 

 close to each other. Tibial apophysis of palpus distal in position and very 

 short. 



Genotype. — L. temporarius, sp. nov. 



Litopyllus temporarius, sp. nov. 



Male. — Carapace fulvous, the legs more orange. Sternum yellowish. 

 Abdomen grey excepting the scutum which is colored like the carapace. 

 Posterior row of eyes decidedly procurved; the median eyes one-fifth their 

 diameter apart, their radius from the laterals. Area of median eyes as 

 wide in front as behind. Met. I and II with a single spine. Tib. I and II 

 with two spines in series under anterior border. 



Length, 6 mm.; cephalothorax, 2.75 mm.; tib. + pat. IV, 2.75 mm. 



Holotype.—M. C. Z. 602 (c^). 



Locality. — Ky. : near Mammoth Cave. 



Litopyllus luteus (Barrows). 

 Prosthesima lutea Barrows, Ohio Jour. Sci., 1919, 19, p. 356. 

 Holotype. — Ohio State Univ. (d). 

 Locality. — Ohio: Sugar Grove. 



Litopyllus rupicolens, sp. nov. 



Female. — Carapace and legs fulvous, the sternum more yellow. Abdo- 

 men grey, without markings. Posterior row of eyes decidedly procurved; 



