34 Annals Entomological Society of America [Vol. IV, 



Genus Buethobius gen. nov. 



First leg-bearing segment without spiracles. 



Ocelli none. 



Tarsi of the first thirteen pairs of legs undivided, those of the 

 fourteenth and fifteenth pairs biarticulate. 



Legs without true spines. Tibiae of the first thirteen pairs of legs 

 with an acutely pointed process at distal end on cephalic side like that 

 of Lamyctes and Zygethobius. (See PI. 4, fig. 1). 



Apparently only females found and the reproduction 

 parthenogenetic. 



Type. — Buethobius oabitus sp. nov. 



3. Buethobius oabitus sp. nov. 



General color yellow or light yellowish brown; the head and pre- 

 hensorial feet and in some the ultimate segments clear orange ; antennae 

 and legs clear yellow. 



Rather slender, for most of length parallel sided. Narrowed over 

 a few segments behind head and more abruptly at caudal end. 



Antennae long, reaching the ninth body segment; composed of 

 thirty-six articles of which those beyond the second are rather short, 

 uniform. 



Prosternal margin wide; teeth 3+3, very small. 



Ocelli none. 



Angles of none of the dorsal plates produced. 



Coxal pores round, moderate in size; 3, 3, 3, 3 — 4, 4, 4, 4. 



Legs of the first thirteen pairs each ending in three claws; those of 

 the fourteenth and fifteenth pairs with the claws single. Anal legs long 

 and slender. 



Claws of gonopods undivided; basal spines 2+2. 



Length 10-12 mm.; width at the tenth plate 1.3-1.4 mm. 



Locality. — Byram and Canton, Miss. 



Genus Zygethobius Chamberlin. 

 Sub-genus Zantethobius subgen. nov. 

 Angles of the sixth, seventh, ninth, eleventh and thirteenth dorsal 

 plates produced. 



Type. — Zygethobius pontis, sp. nov. 



The previously described species, Z. dolichopus Chamb., 

 the type of the genus, may be placed in a subgenus Zygethobius 

 sens. str. 



4. Zygethobius pontis sp. nov. 



Moderately robust; strongly narrowed caudad and cephalad of the 

 tenth dorsal plate, the first leg-bearing segment especially narrow. 



Dorsum in color somewhat chestnut, with a narrow median longitu- 

 dinal stripe blackish, the first segment darker than the others; head 

 •deep to blackish brown; prehensorial feet and antennae reddish, the 



