BY THOMAS G. SLOAXE. 633 



posterior transverse impression very strongly impressed; a narrow 

 lightly reflexed carina on sides extending back from anterior 

 angles almost to middle. Elytra oval (9 x 5 - 8 mm.), parallel 

 on sides, arcuate-truncate at apex with external angles widely 

 but shortly rounded, strongly punctate on basal half, roughly 

 granulate amongst the punctures near the base, the puncturation 

 finer and the derm not granulate posteriorly; apical declivity 

 smooth (minute punctures and transverse ruga? noticeable under 

 a lens). Ventral segments rugulose; rugae of three basal seg- 

 ments longitudinal on sides; last segment narrowly bordered, 

 median apical notch of £ very small. Length 15-18, breadth 

 5*3-6 -8 mm. 



Hab.— Carnarvon District (Shark's Bay), W.A.; several speci- 

 mens sent to me by Mr. C. French. 



This species by its cylindrical and parallel form, connate elytra, 

 absence of wings and the small median notch of the apical ventral 

 segment in the <£ is allied to T. ( Megacephala) cylindrica, Macl., 

 but differs from that species, and also from T. (Megacephala) 

 frenchi, SI., and T. (Megacephala) spenceri, SI., by its shorter 

 elytra more truncate at apex, and the well developed lateral 

 carina on the anterior part of the prothorax. The features 

 given above as characteristic of T. cylindrica and its allies 

 seem to be those which chiefly serve to differentiate that 

 group of species from the other unicolorous Australian species, of 

 which T. pulchra, Brown, is the type, which are species of quite 

 different facies, the elytra being shorter, more depressed, much 

 more ampliate at the base as compared with the prothorax, and less 

 parallel on the sides. T. (Megacephala) howitti, Casteln., is a 

 species I have not before me; in many ways it seems intermediate 

 between T. cylindrica and its allies, and T. pulchra and its allies. 

 The Rev. Thos. Blackburn, who knows T. howitti., believes it to 

 be an apterous form. See pp. 634-635 for some interesting notes 

 from his pen on this species. 



Note.— M. Fleutieux has formed the genus Pseudotetracha, for 

 species of which T. cylindrica is the type, but the genus is so 

 characterised that I doubt whether any species except T. cylindrica 

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