BY THOMAS G. SLOANE. 323 



lateral carina of the prothorax ending a little before the base; it 

 attains the base in M. blackbumi according to Fleutiaux.* 



I have found no variation in the lateral carina of the prothorax 

 in any Australian species of which I have seen more than one 

 specimen, but Dr. Horn has informed me that this character 

 varies in African species of Megacephala; possibly it does so in 

 M. blackbumi. 



Megacephala intermedia, n.sp. 



J". Allied to M. basalis Macl. (in general appearance inter- 

 mediate between M. basalis and M. crucigera Macl.). Head, 

 prothorax, sides of mesosternum, metasternum, and basal ventral 

 segments green; elytra with wide testaceous margin and a discal 

 viridescent anchor-shaped mark (posterior part of this mark wide 

 and nigro-viridescent). Elytra with apical edge minutely 

 serrulate. Length 13-5, breadth 6 mm. 



Hab. — N.W. Aust.: King's Sound (Macleay Museum), Carnot 

 Ba}- ( fide French). Colls. Macleay Museum, French, Lea, Sloane. 



This species is in the Macleay Museum under the name of 

 Tetracha australasice Hope, a species which European coleopterists 

 consider conspecific with the species known in Australian collec- 

 tions as T . humeralis Macl. 



M. intermedia (£) differs from M. basalis (£) by left mandible 

 with apical tooth very long, narrow, and extending greatly 

 beyond the penultimate tooth, the third tooth (counting apex) as 

 large and as prominent as the penultimate tooth; labrum with 

 four triangular pointed teeth of nearly equal size in middle (in 

 M. basalis £ these teeth are represented by inconspicuous obtuse 

 prominences); antennae without black maculae on basal joints. 

 The prothorax is generally similar, but not so strongly constricted 

 opposite the posterior transverse impression; this impression not 

 reaching the sides of the pronotum to join the basal furrow of 



* I subsequently sent this specimen to Dr. W. Horn, who wrote under 

 date of 12th April, 1906, " To-day I got Fleutiaux's type of Tetracha black- 

 bumi; the specimen you gave me is without doubt the same species. . . 

 The carina of the pronotum, the posterior sulcus, the formation of the 

 posterior lateral angles, the sculpture of the elytra, etc., are identical." 



