BY E. ^V. FERGUSOK. 425 



I have specimens of the typical form from Champion Bay and 

 Mullewa ; and of the more strongly tuberculate form from 

 Onslow, Murchison River, and Central Australia. 



MoLOCHTUS TIBIALIS Sloane. 



Sloane, Trans. Roy. Soc. S. Aust., xvi., 1893, p. 229; Lea, ibid., 

 1903, p. 11 3. 



Tn his description, Sloane has given a number of characters 

 differentiating M. tibialis from M. gagates Pasc; Lea, however, 

 has pointed out that these differences will not hold, and, after 

 examination of a number of specimens, I find that they will not, 

 without modification. The differences in the head, rostrum, and 

 prothorax do not appear to be constant; and I do not think that 

 they can be made much use of in separating the species. The 

 elytral sculpture vaiyes considerably; some of the specimens, 

 including the types, have the sculpture flatter and more obliterate 

 than in others, which approach closely to the less strongly 

 sculptured form of J/, gagates (see under that species); but I 

 have never seen specimens of M. tibialis with sculpture approach- 

 ing that of the more strongly tuberculate form of J/, gagates. 

 There is, however, another difference which will enable the males 

 of the two species to be readily determined, and that is the leg- 

 structure. In il/. tibialis, the tibiae are longer, and the anterior 

 tibia has a subapical emargination or notch on the undersurface. 

 The females of AI. tibialis have also longer tibiae than the females 

 of 3f. gagates, but the difference is only really apparent when 

 specimens of the two species are compared together. 



The specimens of M. tibialis in my possession include, in all 

 probability, the tj'pes; the female type is marked as such, but 

 there is also a male from Fraser Range (the type-locality) which 

 agrees exactly with Sloane's description and measurements, 

 whereas none of the South Australian Museum specimens agree 

 exectly with Sloane's measurements. 



The species has a wide range, from Central Australia to the 

 coast-board of Western Australia in the neighbourhood (at least) 

 of the Ashburton River. 



