PAPIRIUS. 121 



segment is '005" in length; the second '0225"; the 

 third is a Httle longer than the second, and especially 

 towards its apical end, which is slightly swollen, and 

 resembles a knobby stick. The terminal segment is 

 about as long as the basal, and is somewhat conical. 

 The whole organ is covered with scattered hairs, which 

 are particularly numerous on the distal half of the third, 

 and on the apical, segment. On the latter they are 

 arranged in whorls, giving the organ an appearance of 

 being jointed, which, however, is not really the case. 

 The mandibles much resemble those of S. fuscus ; I 

 found, however, in my specimens six apical teeth on 

 one mandible, and only four on the other. The 

 maxillse also resemble those of the S. fuscus. The 

 arrangement of the teeth is, however, a little different ; 

 and they appear to be rather more numerous. The 

 palpus is simple, short, "005" in length by "002" in 

 breadth, and rounded at the apex ; it bears one long 

 and two or three short hairs, not at the apex, but 

 almost in the middle of its length, though rather nearer 

 the free end. The organ is membranous, and in most 

 parts transparent. The upper lip is about '00416" in 

 width, and is quadrate in outline, with the corners 

 rounded off. The free edge is roughened by minute 

 teeth, which are largest towards the centre ; on each 

 side there is also a row of larger teeth, parallel with 

 the anterior margin, and with the teeth pointing 

 inwards. The organ is also provided with scattered 

 hairs. The legs are longer in proportion, but at the 

 same time thinner, than those of the /S. fuscus. The 

 proportions of the different legs are the same, the 

 anterior being the smallest, and the second pair inter- 

 mediate in size between that and the third pair. In 

 the relative sizes of the different segments, also, this 

 species agrees very closely with Simjnthurus fuscus, the 

 coxa being short, and the three following segments 

 increasing in size almost in a geometrical ratio. The 

 whole organ, except the tarsus, is clothed with scattered 

 hairs, which, however, are most numerous on the tibia. 



