120 F, Erasmus Wilson : 



strong club. Prothorax very lightly transverse, convex, sides strongly 

 rounded to about middle, thence to base very lightly bisinuate, trans- 

 verse basal groove and lateral foveae as in strigicephalusj in front of 

 groove with disc coarsely longitudinally strigose, behind with punc- 

 tures as on head. Elytra lightly transverse, apical margin of each 

 elytron produced about middle, sutural and dorsal striae well defined, 

 the latter very lightly deflected outwards at their apices; epipleural 

 furrow very distinct, arising from a small roundish fovea at basal 

 and terminating at apical fourth, puncturation well distributed, but 

 somewhat obscure. Abdomen about equal in width to elytra at their 

 widest, with two short medio-basal carinules, puncturation much as 

 on elytra. Metasternum widely and somewhat deeply impressed down 

 middle. Anterior trochanters rather strongly toothed. Undersurface 

 of abdomen with second segment impressed on disc and with two 

 medio apical lamelliform protuberances, these lightly overhanging the 

 following segment and then recurved strongly outwards, their apices 

 rounded, and their bases lightly connected, fourth segment at sides 

 with two subapical lamelliform protuberances directed obliquely back- 

 wards, apex of segment straight across middle, and forming the basal 

 margin of a large cavernous apical excavation with straight diverging 

 sides. Legs with femora fairly stout, the anterior ones with a blunt 

 tooth a little nearer base than apex; front tibiae straight, increasing 

 in width from base to about apical fourth, thence suddenly constricted, 

 thus forming a blunt tooth; intermediate tibiae narrower, lightly 

 arcuate and weakly constricted just before apex, hind tibiae much 

 inflated on apical half, and strongly notched close to apex, much 

 excavated on side in neighbourhood of notch. 



Length, 3 mm. (vix). 



5 Similar, but a little smaller, with an additional small fovea 

 on disc immediately behind inter-ocular foveae, no armature on 

 femora, tibiae normal. Abdomen beneath convex. 



Habitat. — Victoria: Lakes Entrance (F. E. Wilson). 



This species, of which I collected J' J' $ $ from moss growing 

 on the ground, is readily distinguished from its allied species by the 

 remarkable armature of the <^ ventral segments. 



Type in author's collection. 



Rybaxis strigicollis, Westw. 



This fine species was described in Trans. Ent. Soc. Lond. 1856^ 

 p. 269, and a very excellent figure is given in Plate 16, f. 1. It is in 

 my experience a very rare insect. Westwood records Melbourne as 

 the type locality, his specimen having been taken in association with 

 ants. My unique example was secured from a nest of the ant 

 Iri(loviy7'mex nitidus at Ringwood, near Melbourne. The antennal 

 club alone serves to distinguish it from its allied species, as the 

 9th and 10th joints are black, forming a striking contrast to the other 

 pale joints. The eleventh joint is also rather strongly bent. 



Westwood's specimen must have been a female (he does not 

 state the sex), and the following well marked male characters should 

 be associated with his description. 



