BY T. G. SLOANE. 601 



X 7 mm.), widest and ampliate about middle, wider across 

 apex (42 mm.) than base (3 mm.) ; sides evenly rounded ante- 

 riorly, obliquely narrowed posteriorly, subsinuate before base : 

 anterior margin truncate in middle, a light sinuosity between 

 median part and anterior angles, these near neck, not quite 

 as prominent as median part ; base lightly bisinuate : lateral 

 margins punctate ; border reflexed, subrotundate posteriorly ; 

 basal angles sharply marked; disc a little raised, with some 

 scattered, rather large punctures towards apex and base, finely 

 transversely striolate, especially towards sides. Elytra paral- 

 lel ; striae finely punctate ; interstices closely punctate, espe- 

 cially towards apex. Length 32 mm. 



Hab. — Central Australia: Tennant's Creek. (Unique in 

 my collection; received from Mr. C. French). 



Closely allied to G. rugaticolle Blkb., but differing by pro- 

 thorax smaller, less strongly rugose, anterior margin more 

 prominent than anterior angles, lateral margins more concave 

 and so forming a wide channel, base less strongly bisinuate, 

 basal angles more sharply marked ; elytra more closely punc- 

 tate, the punctures a little finer, particularly on the odd inter- 

 stices ; ligula more narrowed to apex, with the flattened discal 

 area much smaller, the surface less punctate ; tooth of mentum 

 more prominent ; gular pominence quite different, shorter and 

 out-turned on each side in a conical process. From G. grand e 

 Macl., it differs greatly by prothorax smaller, the anterior 

 margin in cf not nearly as prominent as in G. gr ancle 9 > 

 punctures of elytra closer, the second, third, fourth, and fifth 

 interstices not biseriately punctate in the greater part of their 

 course ; gular horn of different shape, etc. 



GiGADEMA RUGATICOLLE Blackbum. 



Piceous-black. Head punctate; front striolate, longitudi- 

 nally on each side, transversely in middle. Prothorax in cT 

 transverse (5-3 x 7-5 mm.), widest about middle, ampliate on 

 sides, wider across apex (4-5 mm.) than base (3-2 mm.), angus- 

 tate to base ; sides hardly subsinuate just before base ; ante- 



