BY ARTHUR M. LEA. 73 



Cryptobium Mastersi, Macl. (?) 



I have two specimens from the Upper Ord River which I 

 cannot structurally distinguish from this species, but which differ 

 in having the antennte and legs of a dull red, the basal half of 

 the femora paler but still of a reddish colour. One of these 

 specimens is a male, and has the 5th abdominal segment slightly 

 emarginate at its apex, and with the 6th deeply and triangularly 

 excised. Sir William did not describe the sexual characters of 

 the types, and my three typically coloured specimens (from New 

 South Wales and North West Australia) are females. 



C. apicale, Macl. Hab. — Behn and Upper Ord Rivers, 

 N.W.A. 



C. fractum, Fvl. Hab. — Vasse, Swan River, Albany, W.A. 



C. VARICORNE, Blackb. (cotype). 



DlCAX VENTRALIS, n.sp. 



(Plate iv., fig. 12.) 



<J. Long, thin and shining. Black; legs and mouth-parts red; 

 the mandibles somewhat darker, antennae piceous, the base of 

 nearly all the joints red. Clothed with rather sparse straggling 

 brownish pubescence, denser (but still comparatively sparse) on 

 abdomen than elsewhere ; apex of elytra fringed with short 

 golden hairs. 



Head longer than wide; sides with large and moderately dense 

 punctures, absent on median line and on clypeus, with numerous 

 small scattered punctures more noticeable on clypeus than else- 

 where ; antennary tubercles large. Clypeus rather strongly 

 depressed on each side. Mandibles fully as long as the head, the 

 apices considerably projecting beyond each other when at rest. 

 Antennae moderately slender, not extending to base of prothorax, 

 1st joint as long as>2nd-3rd combined, 3rd-10th gradually decreas- 

 ing in length, 11th slightly longer than lOth. Prothorax sub- 

 cylindrical, narrower than head, apex truncate, posterior angles 

 rounded; each side along middle with a somewhat irregular, but 

 very distinct series of punctures of somewhat smaller size than 



