98 C. CHILTON. 



and in place of the triangular notch has a median fissure; 

 on the terminal segment there is a faint longitudinal sulcus 

 or stria, but there are no evident ridges, as in C. helmsianus. 



From Barrington Tops, I have three specimens, the 

 largest, which has the dimensions given above, is much 

 lighter in colour than the other two, being of a reddish 

 brown, while the others are dark brown or almost black; 

 in all there are marblings of lighter colour. The longi- 

 tudinal ridges on the terminal segment also seem to vary 

 in development; in the two darker specimens they are 

 evident, particularly in one of them, while in the lighter- 

 coloured specimen a faint longitudinal sulcus can be made 

 out, but hardly any trace of the ridges. 



In addition to the Barrington Tops specimens, I have 

 three specimens collected on Mount Kosciusko many years 

 ago by the late Mr. R. Helms, and forwarded to me by the 

 Australian Museum, but hitherto undescribed. These are 

 all rather lighter in colour than the Barrington Tops speci- 

 mens, but agree in the notch in the epistome, the ridges on 

 the terminal segments, etc. Some of them still bear the 

 antennae which I am therefore able to figure and describe; 

 they have been broken off in all the specimens from 

 Barrington Tops. 



In all these specimens the surface of the segments is 

 somewhat uneven, generally forming a transverse row of 

 indistinct tubercles, a little anterior to the posterior margin 

 of the segment. These tubercles vary in number and in 

 prominence; usually there appear to be six or seven on 

 each side of the median line with rather fewer on the 

 posterior segments, and they are sometimes less distinct 

 near the median line. I have one specimen from Grafton, 

 N.S.W., sent me by R. Helms in 1894, which I think belongs 

 to C. helmsianus, and in that the tubercles on the segments 

 of the peraeon and the ridges on the terminal segment of 

 the pleon are much more distinctly marked. 



