ORCHE SELLA. 133 



shaped, processes, serrated on their inner margin. At 

 the side of these are two other lobes : one of these is 

 long, narrow, pointed, and generally lies, as it were, 

 across the top of the organ ; it is serrated at its free 

 extremity on the inner edge. The other lobe is large, 

 and ends in a tooth pointing inwards ; the outer border 

 is arched, the inner straight. It is, however, by no 

 means easy to make out these different processes in a 

 satisfactory manner. 



The appendage which I regard as the palpus, is 

 quadrate, but rounded off at the angles, and tapers 

 slightly towards the apex. The apical margin is 

 somewhat concave. The palpus has on one side a 

 small process, which terminates in a stout bristle. At 

 the base of the process is another stout seta, in 

 addition to which the organ bears three smaller hairs. 



The second pair of maxillse are membranous, and 

 have the apical margin excavated, with a tooth at the 

 inner angle. 



The eyes are arranged as usual in the genus, and do 

 not differ much in size. The antenna, which is in- 

 serted just in front of the "quadrilateral," must some- 

 what obstruct the field of view. 



The feet possess a tenent hair and two strong, 

 though unequal, claws. The larger claw has a strong 

 spine on the outer margin near the base, and two 

 smaller ones on the inner margin, which are situated 

 at almost equal distances from one another and from 

 the two extremities. Near the tip is sometimes an 

 indication of the third spine which we find more deve- 

 loped in the preceding species. 



The small claw is lanceolate and simple. Near the 

 base, however, and on the inner margin, is the rudi- 

 ment of a tooth ; but in many cases it is very difficult 

 to perceive. 



All the three legs are alike, so far as the constitution 

 of the foot is concerned. 



The caudal appendages end in a claw which is 

 curved downwards, and has on the under surface a 



