92 Mr. B. F. Cummings on 



the swollen base of the head is lieltl in a " stiff collar " 

 ibrmed by the thorax, and a|)i)arently, theretore, incapable of 

 nnich lateral motion. The median aroas of both dorsal and 

 ventral surfaces are composed of rather tliin, smooth chitin, 

 but both behind and in trout of theantennai the head ou each 

 side is strengthened by chitinous areas of greater thickness, 

 liehind the antenna this thickened area on the dorsal surface 

 begins as a more or less circular, raised or embossed patch 

 bearing a long bristle and a minute hair. This patch extends 

 down on each side to the ventral surface, where it occupies 

 the margin and runs forward past the antenna to join the 

 peristomial band. This band is a strong circular support, 

 from which arise the triangular denticles (fig. la, PB). 

 Each denticle appears to be a triangular plate; its apex 

 ])oints backwards and its base is set transversely to the peri- 

 stomial band. In the centre of two of the denticles there is 

 a hole as in a set-square. Within the peristomial band lies 

 the small oral cone (fig. 1 a, OC), at the apex of which is i\\Q 

 short colunmar oral opening (tig. la, 00). Behind the 

 antennaj dorsally is a shallow, indistinct, transverse groove^ 

 Antenna 5-segmented, slightly club-shaped as the fourth 

 segment is broader than the second, third, or fifth, and its 

 postaxial margin is longer and somewhat convex. There is 

 a circular sensorium between segments -1 and 5 on the ventral 

 surface and another on segment 5 on the postaxial line. 



Thorax much broader than the head, and broader behind 

 than in front. Claws on the front tarsi, which in both speci- 

 mens carry two hairs, are either absent or minute. On the 

 other legs the claws are large, in shape like the beak of an 

 accipitrine bird. 



Abdomen much broader than tlie thorax, ovate, large. 

 Neither sternites nor tergites present. On each of the first five 

 segments a pair of pleurites. A fairly broad chitinous band 

 runs transversely over the dorsum of the terminal segment. 

 A chitinous framework supports the flat rounded gonopods. 

 This consists of a cross-bar running from the base of one 

 gonopod to the other, and running back from each extremity 

 of this cross-bar in the direction of the head a short band 

 slight!}' bending inwards. The gonopod is a flattened lobe, 

 convex at the extremity, a little concave along the inner 

 margin. 



Chcktotaxy. Female. — Head : on the upper surface is an 

 elongate bristle, reaching nearly down to the abdomen, along 

 with a minute hair close to it situated on the small embossed 

 area behind each antenna. Two minute hairs, widely sepa- 



