56 



Labium rather small, reaching, when folded, to the bases 

 of the middle legs ; submentum shortened ; mentnm narrowed 

 at its proximal end, its median lobe prominent, rounded, fringed 

 with a row of flabellate scales whose bases are overlaid and 

 supported by another series of shorter semicylindrical scales ; 

 beneath this fringe, the margin cut into a series of obscure 

 rectangular teeth ; lateral lobes short, nearly straight, unarmed, 

 rounded at apex ; movable hook stout, moderately incurved, 

 and tapering. 



Thorax sloping to the head and to the bases of the legs ; 

 prothorax of unusual dimensions on the dorsal side, its hind 

 margin on a line with the bases of the hind legs, being extended 

 back upon the other thoracic segments, shield shaped, with a 

 short collar close behind the head. Wing-cases strongly di- 

 vergent. Legs conspicuously fossorial, fore legs approximate 

 to the sides of the head, bearing shields of stiff hairs behind 

 which the middle legs may be brought forward. Middle legs 

 approximated on the venter, rotated downward and extended 

 horizontally close under the fore legs. Hind legs longer, more 

 nearly normal, directed posteriorly. Fore tarsi with soles fac- 

 ing laterally ; middle tarsi rotated on tibiae so as to point back- 

 ward ; hind tarsi elongate, the third segment about as long as 

 both basal segments, its claws sharp and long ; claws of fore 

 and middle tarsi short and blunt. Each femur with a distal 

 anterior process which rests against and supports the tibia 

 when moved backward. 



Abdomen spindle-shaped, segments about equal, the 9th a 

 little longer than the others; dorsal hooks variable, rudimen- 

 tary, more or less well represented on segments 2 to 9, small- 

 est on middle segments. Lateral spines on 5 to 9, on 5 rather 

 minute. Appendages slender, tapering; superior and inferiors 

 equal, about one third longer than segment 10, laterals about 

 half as long as the others. 



