BY ARTHUR M. LEA. 609 



suture with a faint golden lustre, continued and brighter on the 

 prothorax. Elytra with sparse, shallow punctures, only visible 

 when the pubescence has been scraped away. 



Head (except eyes) completely concealed by prothoracic horn; 

 eyes large, round, prominent; antennae reaching basal third of 

 elytra. Prothorax (excluding horn) scarcely transverse, widest 

 in front; base truncate, in its middle a short longitudinal excision; 

 horn half the length of the prothorax, outer row of tubercles 

 thirteen in number, lower surface highly polished. Elytra about 

 one and a half times as long as entire prothorax, very gradually 

 widening to beyond the middle. Legs slender, posterior tibife 

 feebly bent. 



A specimen (which I take to be a female) has the prothorax 

 more transverse, the outer I'ow of tubercles on the horn eleven in 

 number, the elytral markings larger but more obscure and the 

 entire upper surface duller. Length 2|, width l^mm. 



Hab. — -Windsor; three specimens in flood debris on the Hawkes. 

 bury River. 



The above is an extremely pretty species; it may be distinguished 

 from M. ziczac by its larger size, median maculee (which in that 

 species resemble an irregular W); M. ziczac has also a faint 

 longitudinal deepening of colour on each side of the middle of the 

 prothorax, and in all the specimens I have seen (many hundreds) 

 without the peculiar lustre of i/. amabilis. 



M. Kreusleri, King; Masters' Cat. Sp. No. 4265. 

 Hab. — Tarn worth. 



M. ZICZAC, King; Masters' Cat. Sp. No. 4267. 

 Hab. — New South Wales; common and widely distributed. 



FORMICOMUS POSTICALIS, n.sp. 



Elongate, subdepressed, hardly shining. Piceous-black; antennae 

 (especially apical joint), tarsi and prothorax paler, claw joints of 

 tarsi testaceous, elytra with a straight white fascia at the base, 

 and a smaller one composed of whitish hairs near the apex. 

 Densely and very minutely punctate and pubescent all over. 



