122 F. Erasmus Wilson : 



ivith a wide, somewhat shallow excavation common to the second, 

 third and fourth segments, fourth segment with a median subapical 

 lamelliform protuberace directed obliquely backwards, broader at 

 base than apex, which is somewhat truncated; apical segment lightly- 

 transversely impressed at base. Legs with femora robust; anterior 

 tibiae roliust, lightly arcuate, toothed internally just in front of 

 middle; intermediate tibiae with a similar, somewhat more pronounced 

 tooth just before middle, posterior much longer, thin, and lightly 

 curved. 



Length, 2.5 mm., approx. (my specimen is bent somewhat). 



Habitat. — Victoria: Lorne, in moss. (F. E. Wilson). 



Type unique, in author's collection. 



Rybaxis similis, n.sp. 



S" fery close to otwayensis, but differs in having an additional 

 small sub-median tooth on its anterior trochanters, and in the 

 very different structure of its second ventral segment. This, at its 

 apex, is straight across the middle half, but on either side of the 

 straight portion it is produced in the form of a thin plate continuing 

 the same plane as the rest of the segment. Apparently the plate 

 is continuous right round the dorsal surface. Being somewhat trans- 

 parent ventrally it is possible to discern the normal margin of the 

 segment beneath it. The basal abdominal excavation is also a little 

 more pronounced than in the preceding species. 



Length, 2.5 mm. 



Habitat. — Victoria: Lorne, in moss. (F. E. Wilson). 



This species can only be distinguished from otwayensis by the 

 characters of its undersurface. In fact, I had the two specimens 

 mounted on the same card as being identical. 



Type unique, in author's collection. 



Rybaxis crassipes, Lea. 



Proc. Linn. Soc. N.S.W., 1910, p. 735. 



I have recently taken a specimen of what almost certainly appears 

 to be this species, from tussocks of snow grass growing on the summit 

 of Mount Donna-Buang, Victoria. Mr. Lea's specimen was taken 

 at Zeehan, Tasmania. 



Collacerothorax spinicollis, n.sp. 



(^ Dark reddish-castaneous; legs, palpi and apical joints of 

 antennae a little paler; uppersurface generally clothed with long 

 black hairs, but on the head and prothorax particularly; there is 

 also a shorter pale pubescence, this most noticeable along the median 

 lines, and in the prothoracic excavations; undersurface with pale 

 decumbent pubescence. 



Head a little elongate, with well-marked antennal tubercules. 

 Immediately behind which it is strongly constricted; deeply excavated 

 along median line, excavation bordered on. either side by a prominent 



