chamberlin: geophiloidea of the southeastern states. 429 



Type. Agathothus gracilis Bollman. 



This genus, the affinities of which have been heretofore wholly 

 problematical, is very close to Linotenia as is evident from the diagno- 

 sis above. It seems proper to group these two genera in a distinct 

 subfamily, Linoteniinae, as indicated in the key (p. 410). But one 

 species is known. 



Agathothus gracilis (Bollman). 



Scoliophmcs gracilis Bollman, Ann. N. Y. acad. sci., 1888, 4, p. 110. 



Agathothus gracilis (Bollman) Bollman, Bull. 46, U. S. N. M., 1893, 

 p. 166. 



Very gradually attenuated cephalad, more abruptly caudad; 

 sparsely hirsute with short straight hairs. 



Yellow; the head with prosternum and prehensorial feet darker, 

 brownish; antennae and legs light yellow. 



Head wider than long in ratio 2.2:2; subquadrate; the anterior 

 margin mesally truncate, laterally a little oblique; lateral margin 

 nearly straight over middle part of length, curving mesad at ends; 

 caudal margin very slightly overlapped by the basal plate. Frontal 

 plate discrete. Basal plate nearly 2\ times as wide as long at middle, 

 a little wider than the cephalic plate. 



Antennae filiform, the first article wider than others; joints all 

 short excepting the ultimate which is much longer than the two pre- 

 ceding taken together, articles gradually decreasing in length from the 

 second to the penult inclusive; about 3.25 times as long as head; 

 clothed with short hairs which on proximal articles are sparse but 

 become denser distad. 



Claws of prehensorial feet very long, when closed nearly attaining 

 the front margin of head, widest above base where they are con- 

 stricted and also excavated dorsally so as to be thin dorsoventrally 

 and blade-like; all articles lacking denticles; very sparsely hirsute. 

 Anterior median margin of prosternum moderately deeply sinuate; 

 prosternum glabrous or nearly so except laterally; wider than long 

 in ratio 23:13. 



Anterior prescuta very short, gradually increasing in length, 

 caudad, becoming moderate or long in middle and posterior regions, 

 where they do not differ much in length. 



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

 third equal and the ultimate ones but little smaller. 



Legs of the first pair but little reduced; anterior and posterior pairs 

 subequal in length and thickness; rather sparsely hirsute. 



