170 KANSAS UNIVERSITY SCIENCE BULLETIN. 



Head large, much longer than wide (5.5:3.4 or 6.3:4), with the cephalic 

 margin slightly truncated, about equal in width to the caudal margin, 

 which is distinctly rounded. The mandibles are large, extending to the 

 base of the third joint of the antennae. They are armed with four teeth, 

 the distal one of which is prominent and black in the adult; the other 

 three are small. The coxae of the mandibles are longer than broad (19:11) 

 and have a slight indentation on the inner surface, distally. The labium 

 is large and square (1:1), and is clearly but not prominently notched. 

 It is not canalate. 



The antennas are short, the first eight joints being sparsely covered 

 with rather long hairs, and the distal seven joints being densely pilose 

 with very short hairs. 



The dorsal plates are distinctly bisulcate, with the exception of the 

 caudal four or five. 



The ventral plates have a distinct median depression, which anteriorly 

 extends from the cephalic to the caudal margin of the plates, but posteriorly 

 it becomes shorter, occupying the middle part as a long, oval depression. 



The spiracles are oval cephalad and round mesad and caudad, growing 

 smaller towards the posterior end. 



The coxae and joints of the anal legs are rather swollen. The coxal 

 pores are round, arrangement irregular, except that most of them are on 

 the ventral surface near and partly concealed by the ventral plate, while 

 a few are grouped near the edge or partly under the dorsal plate. They 

 vary in number from 21 to 25. The anal legs in the female are pilose 

 with rather long hairs, while in the male they are covered with fine hairs, 

 especially distally, among which are numerous longer hairs. 



Legs, pilose; in number, 63 to 69 pairs. Length, 42-45 mm. 



Habitat: Bourbon Co. (Biol. Survey); Cowley Co. (type) (writer). 



Etymology: '5"/;/''i\ long; A :•/"/''•'/. head. 



This species is related to G. stngosns (McNeill) , recorded from Indiana, 

 but differs from the latter in the following points: 



G. striffosus (McNeill). G. duUchocephalus, n. sp. 



Head, longer than wide (3.3:2.1), 

 cephalic margin truncate, caudal margin 

 rounded. 



AntenuEe short, sparsely pilose, almost 

 bare proximal. 



Mandibles armed with two very minute 

 teeth each. 



Labium obsoletely canaliculate, and 

 scarcely emarginate. 



Ventral plates with a distinct mesal de- 

 pression, elongate, forming a shallow oval. 



Head, longer than wide (5.5:3.4 or 

 6,3:4); shape the same. 



Antennffi apparently shorter ; first eight 

 joints sparsely covered with long hairs ; 

 distal seven joints densely pilose with very 

 short hau-s. 



Mandibles large, armed with four teeth, 

 the distal one large and black in adult. 



Labium not canaliculate, and distinctly 

 emarginate, especially in adults. 



Well-marked mesal depression present; 

 cephalad, forming a distinct groove from 

 anterior to posterior margins of plate; 

 caudad, forming an elongated oval. 



Number of pairs of legs, 63 to 69. A 

 specimen 22 mm. long has 69 pairs. 



Length, adult, 42-45 ram. 



Number of pairs of legs, 55. 

 Length, 23.5 mm. 



The above characters applied to G. doKchocephalus are as true of speci- 

 mens 25 mm. long as of the full-grown specimens. 



I know little of the habits of this species, except that they were col- 

 lected with and placed in a bottle containing a large number of Areno- 

 philus bipuncticeps (Wood) ; so I judge their habits are similar. 



