322 REVISION OF THE CICINDELID^E OF AUSTRALIA, 



Having the puncturation of the elytra extending to the apex, 

 this species requires comparison only with M. pulchra Brown, and 

 M. blackburni Fleut. It is closely allied to M. pulchra, having 

 the same small round separate punctures impressed in the derm 

 of the elytra, and the abdomen similarly punctate (the punctate 

 ventral segments differentiate M. pulchra and M. castelnaui from 

 all the other described species of Australia). M. castelnaui 

 differs from M. pulchra by the testaceous apical margin of the 

 elytra (this testaceous margin is less than 1 mm. in width); the 

 sides of the prothorax behind the anterior impression less rounded 

 vertically, and with obsolete traces of a carina, of which no trace- 

 is found in M. pulchra; the lateral margin of the prothorax 

 decidedly incurved outside the position of the lateral carina 

 (hardly incurved but simply rounded in M. pulchra); the trans- 

 verse impressions of the pronotum more strongly impressed. 

 From M. blackburni it differs (from Fleutiaux's description) by 

 elytra with apex testaceous, and not so strongly punctate poste- 

 riorly ; prothorax with lateral carina not strongly developed 

 behind anterior transverse impression; abdomen punctate (im- 

 punctate in M. blackburni). 



The type specimen is in a crushed and damaged state. 



Megacephala blackburni Fleutiaux. 



A specimen (<^) which it seems necessary to place under M. 

 blackburni Fleut., has been sent to me by the Rev. Thomas 

 Blackburn. It resembles M. pulchra Brown, in colour, except 

 that it has a black sutural patch on the basal half of the elytra, 

 this patch being bounded laterally by the subsutural row of 

 fovese. It differs decidedly from M. pulchra by ventral 

 segments im punctate, lateral carina of prothorax extending 

 strongly backwards behind the anterior transverse impression, 

 the apical puncturation of the elytra much stronger. My speci- 

 men also differs from M. pulchra ($) by the apical ventral 

 segment strongly notched. It only differs, as far as I can see, 

 from the description of M. blackburni (the sex not given) by the 



