BY W. MACLEAY, ESQ., F.L.S. 83 



18. ■ — GrlGADEMA POLITULUM. n. Sp. 



Length 12 lines. 



Black. Head and thorax nitid and thinly punctured, the former 

 elongated and narrowed behind the eyes, the latter, with the 

 anterior angles much rounded and advanced, the apex truncated, 

 and median line well marked. Elytra closely covered with small 

 punctures, and striated, with the interstices elevated. 



This species though smaller, most resembles G. longipenne 

 Germ., it however differs from it in many respects, more especially 

 in the long neck and in the rounder and more prominent anterior 

 angles of the thorax. The apex of the thorax also is in this species 

 quite straight, while in the other it is a little concave. 



14. — GiGADEMA SULCATUM, MacL. W. 



Helluo sulcatus, MacL., W. Trans. Ent. Soc. N. S. Wales, 1, 

 1864, page 108. 



Gigadema Thoinsoni, Casteln. Not. Aust. Col. 1867, page 21. 



15. — Helluosoma Masteesii. n. sp. 

 Length 6 lines. 



Entirely of a reddish brown colour. Head very much con- 

 stricted behind forming a small neck. Thorax elongated, truncate 

 in front, much narrowed behind, covered with coarse punctures 

 and longitudinal depressions bounded by rough irregular ridges, 

 with the median line extremely fine and in the middle of the 

 largest of these depressions. Elytra striated and closely punc- 

 tured. Legs and under side of body, abdomen excepted, of a 

 lighter colour than the back. 



Urs. Gemminger and Harold have in their '" Catalogue 

 Coleopterorum," merged the genera Gigadema, Thoms. and 

 Helluosoma, Casteln., in the genus Enigma, Newm. I have, how- 

 ever, jareserved them distinct here, as I believe them to be all 

 good genera. 



