1911] Lithobiomorpha of Southeastern States 33 



cc. Tarsi of all legs Inarticulate ; ocelli present. 



(1. A single pair of ocelli present; an acutely pointed process 



at distal end of tibia; reproduction seemingly partheno- 



genetie, no males occurring Zygethobius Chamberlin. 



dd. A number of pairs of ocelli present, forming a patch on 



each side of the head; a spine at distal end of tibia; 



males occurring . Watobius gen.nov. 



aa Legs provided with articular spims as well as with bristles; no acute process 



at distal end of tibia on cephalic side. 



b. Coxal pores in a single series Lithobius Leach. 



bb. Coxal pores scattered or in several series Bothropolys Wood. 



Genus Lamyctes Meinerl 



1. Lamyctes tivius sp. now 



Slender, widest at tenth dorsal plate, very gradually attenuated 

 cephalad, more abruptly caudad. 



Dorsum yellow to light brown, the head, prehensorial feet and ulti- 

 mate segments darker; antennae and legs yellow. 



Antennae of moderate length, composed of twenty-eight to thirty- 

 one articles; first two articles long, the third and fourth very short, the 

 fifth and sixth longer, the seventh and eighth again very short, the ninth 

 longer, the tenth and eleventh in turn shorter, the twelfth and subse- 

 quent articles comparable to the ninth, or the thirteenth and fourteenth 

 in some reduced; this alternation of pairs of shorter articles with longer 

 ones in proximal portion of antennae apparently constant in this species. 



A single pair of large ocelli. 



Prosternal teeth 2 + 2, small, or 3 + 3, the outer one on each side 

 smallest. 



Angles of none of the dorsal plates produced. 



Coxal pores small, round, 2, 3, 3, 3. 



Anal legs long and slender, the joints of tarsus especially so; pre- 

 femur long, clearly more slender proximally than that of the penult 

 pair, clavately enlarged distad; tibia of nearly uniform diameter 

 throughout length, the first tarsal joint of similar shape and length 

 but more slender. (See PI. 3, fig. 2 cf. also figs. 1 and 3). 



Claw of gonopods entire. Basal spines 2 + 2, rather stout, the inner 

 considerably smaller. 



Length 6-7.5 mm. 



Localities. — Byram and Holly Springs, Miss.; New Orleans, 

 La.; Jackson, Ala.; Atlanta, Ga. ; Hot Springs, N. C. 



2. Lamyctes tivius var. pius, var. nov. 



Agreeing in general with the species as above described 

 but conspicuously longer and more robust, the length of spec- 

 imens examined lying between 9 and 9.5 mm. Color uniformly 

 darker. 



Locality. — Hot Springs, N. C. 



