NOTHRUS HORRIDUS. 607 



near the pseudo- stigmata, which look rather hke rudi- 

 mentary lamellae. Interlamellar hairs long, fine, seti- 

 form, very difficult to see. The two first pairs of 

 apodemata long ; sternum scarcely developed. 



Legs of moderate length, the fourth pair very slightly 

 passing the hind margin ; thick, rough ; gradually 

 diminishing in thickness, but each joint is slightly 

 enlarged at the distal end. From the dorsal aspect 

 the 00X33 of the second and third pairs are entirely, 

 and those of the fourth almost, hidden by the abdomen. 

 Genuals and tibiae of about equal length ; the tarsi the 

 longest joints. The legs are furnished with short, 

 thick, curved, almost hooked hairs, each of which springs 

 from a small but very distinct chitinous apophysis. 

 They are arranged about as follows, viz. : two on the 

 outside of each femur and two on the inside of those of 

 the first and second pairs ; one on the outside of each 

 genual, two on the outside of each tibia ; and one 

 on the inside of each of these joints in the first and 

 second pairs of legs ; four or five on each side of each 

 tarsus, and one on the upper surface of each joint. The 

 tarsi have the usual fine hairs. Claws tridactyle, 

 almost homodactyle, but the central claw the shortest. 



Abdomen oblong, raised above the cephalothorax. 

 Progaster slightly convex, hind margin with a small 

 concavity on each side, at the inner angle of which is 

 a chitinous cylindrical apophysis bearing a large rough, 

 spatulate, curved hair; a smaller similar hair projects 

 from the ventral surface about the middle of this con- 

 cavity. Between the two apophyses the hind margin 

 forms one large concavity, the greater part of which is 

 occupied by a median flat projection from nearer the 

 ventral surface ; this projection has sides sloping back- 

 ward and inward, and a concave hind margin ; at each 

 outer corner it bears a hair, similar to those last named, 

 springing from an apophysis. Lateral margin straight 

 in general outline but with an irregularly indented edge. 

 The general level of the notogaster is flat, but there 

 are elevations and depressions as follows : viz. a more 



