130 Transactions. — Zoology. 



2nd Genus, Ctenochiton, mihi. 



1. Ctenochiton perforatus, mihi. 



(Trans., vol. xi., p. 208.) 



Fig. 28. 



I have come to the conclusion that the female antennse of this insect 

 have only six joints. The point is by no means easy to settle. After the 

 second, which is very short, comes a long joint, which I have hitherto 

 taken for two. At the extremity of this there are three or four hairs, and 

 half-way along its length a hair springing from a very small depression, 

 which seems to run in a ring round the joint, and this ring I have con- 

 sidered as a true division. I think now that it is not so, and that the third 

 joint is really a very long one, almost equal indeed to all the rest of the 

 antenna. Fig. 28 shows the features referred to. The point is of impor- 

 tance in this respect, that one of the characters distinguishing the genus 

 Ctenochiton from Ceroplastes I have taken to be the seven-jointed antenna, 

 Ceroplastes having six. I have not made a thorough examination lately of 

 the antennas of Ctenochiton viridis. C. piperis and C. spinosus have, I think, 

 undoubtedly seven joints. In any case, the fringed test is a sufficient dis- 

 tinction of the genus. 



2. Ctenochiton flavus, sp. nov. 

 Figs. 10-21. 



Female test (fig. 10) golden, waxy, flat beneath, convex above ; outline 

 circular or slightly elliptical, with a fringe of broadly triangular segments 

 round the edge. Apex of the test an irregular elongated mass of wax, the 

 remainder divided into two concentric series of plates, the inner series 

 pentagonal with sharp angles, the outer pentagonal with rounded angles 

 and with the outer side forming the base of the segments of the fringe. 

 The inner series forms often irregular lumps of wax. 



The adult female (fig. 11) fills the test, shrivelling up after gestation : it 

 is consequently flat beneath, convex above, with general outline of Lecanidse. 

 The spiracular spines, as shown in figs. 11 and 13, are very long and con- 

 spicuous : from their base a double row of minute circular spinneret orifices 

 runs as far as the spiracle, with two or three outlying ones at the base of 

 the spine : and I think a single row of the same kind of orifices runs across 

 the body to the spiracle on the other side. Along the edge of the body 

 there is a series of conical sharp spines (fig. 13) : and scattered all over are 

 many tubular projecting spinnerets as shown in the same figure. The 

 abdominal cleft is deep, and the two lobes are conspicuous on the dorsal 

 side : these lobes are not, as usual in the Lecanida? generally, smooth, but 

 irregular, and each bears at the end three or four strong spines. The 

 antennae have six joints (fig. 14) : but the third joint often looks like two, as 



