422 bulletin: museum of comparative zoology. 



to the median length of prosternum nearly as 3:5, length to greater 

 width as 3:2; claws strongly curved, when closed extending beyond 

 the front margin of head and nearly attaining end of first antennal 

 article; claw at base with a rather long, apically truncate, subcy- 

 lindrical tooth; the prefemur with two subdentiform but not strongly 

 chitinized processes, one at distal end and one at proximal end of an 

 excavation (Plate 1, fig. 6). 



Dorsum bisulcate as usual, the sulci very fine and also with a fine 

 median sulcus; sparsely hirsute with short straight hairs. Prescuta 

 of middle region moderately long to long, becoming very short cepha- 

 lad and caudad. 



Spiracles all circular, the first much larger than the second, the 

 others decreasing from the second caudad. 



First pair of legs distinctly reduced; the posterior pairs clearly 

 more slender than the anterior. 



Anterior ventral plates with a median longitudinal sulcus which on 

 the first ones does not extend cephalad of the middle where it ends 

 abruptly but on others reaches cephalic margin and is crossed by 

 transverse depression. Anterior plates with caudal margin extended 

 and fitting into shallow excavation of succeeding one. No ventral 

 pores detected. 



Last ventral plate wide; caudal margin straight, the sides converg- 

 ing caudad. Coxopleural pores mostly 4 to 8 of which 2-4 are com- 

 monly covered by the ventral plate; when the larger number of pores 

 is present, some may be on lateral portion of coxopleura. 



Anal legs much longer and more crassate than penult in both male 

 and female. Without claw, in its place ending in the minute process 

 suggesting an additional article. 



Anal pores distinct, moderately large, relatively. 



Pairs of legs uniformly 49 in the male, and 51 in the female. 



Length of male ad. 14 mm. ; of female up to 22 mm. 



Localities. — Anniston and Maplesville, Ala.; Tallulah Falls, Ga. 



Gnathomerium Ribaut. 

 Bull. Soc. hist. nat. Toulouse, 1910, p. 106. 



Gnathomerium umbraticum (McNeill). 



Mecistocephalus umbraticus McNeill, Proc. U. S. N. M., 1887, 10, 

 p. 332. 



