566 



witli a wide and deep excavation, sides and apex armed ; 

 cavity transversely strigose, sides with scattered punctures. 

 Elytra subquadrate, narrower than widest part of prothorax ; 

 sutural stria well-defined and with irregular punctures, 

 elsewhere striation and punctures very feeble or absent. 

 Pygidium with punctures only about base. Legs very powerful ; 

 spurs of hind tibiae very long, thin, acutely pointed, and 

 subequal. Length, 17-20 mm. 



Hab. — Northern Territory: Melville Island (W . D. 

 Dodd). Type, I. 2279. 



Readily distinguished from all previously described 

 species by its striking colours, these being alike on six 

 specimens taken by Mr. Dodd. Structurally it is allied to the 

 preceding species, and the cavity of the prothorax is much 

 the same, but the lateral projections are less exaggerated, and 

 the depression on the front face of each is larger, the medio- 

 apieal projection extends well over the head, and its tip is 

 conspicuously notched, so that from in front it appears like 

 a V or U, directly from behind it appears acutely bifid : the 

 transverse carina, marking the hind margin of the clypeus, 

 is sometimes quite as strongly elevated as the front margin, 

 but is sometimes less than half its height. 



PSEUDORYCTES TRIFIDUS, Blackb. 



PI. xxxv., figs. 58-61. 

 Several males of this species were taken by Mr. H. 

 Hardoastle at Cunnamulla (Queensland) ; of these a small one 

 (fig. 61) differs from the normal form in having the frontal 

 horn of the prothorax smaller and bifid. A female has the 

 prothorax wide flattened and unarmed, the head with the 

 clypeal cavity much smaller, and the club of the antennae 

 only about half the size of that of the male. 



PSEUDORYCTES MONSTROSTJS, Blackb. (pi. XXXV., figS. 49, 



50). 

 P. mullerianus, White (pi. xxxv., fig. 51). 

 P. turritus, Macl. (pi. xxxv., figs. 52-54). 

 P. dispar, Sharp (pi. xxxv., figs. 68, 69). 

 P. tectus, Blackb., Ooldea (pi. xxxv., figs. 47, 48). 



Illustrations of these species are given for purposes of 

 comparison. 



The males of this fine genus (except sulcatus, unknown 

 to me, but certainly allied to ater) may be tabulated as 

 follows : — 



A. Prothoracic cavity entirely glabrous. 



a. Elytra coarsely sculptured ater 



aa. Elytra finely sculptured. 



b. Elytra bright red semicrudus 



bb. Elvtra Mack validus 



