178 



MR. J. S. BALY ON SOME GENERA 



flavous. Thorax twice as broad as long; sides diverging and 

 slightly sinuate from the base to beyond the middle, thence 

 rounded and converging to the apex ; lateral margin strongly 

 reflexed; disk transversely sulcate, the sulcation strongly 

 excavated on each side, nearly obsolete on the middle disk. 

 Elytra narrowly oblong, slightly dilated posteriorly, slightly 

 but distinctly excavated below the basilar space, finely punc- 

 tured. 



I only know a single specimen (a $ ); it is at once to be 

 known from its allies by the interrupted sulcation on the thorax. 

 This species is the one to which, in a note to the second Table in 

 my former paper on Aulacophora, I have alluded to sle pahistris, 

 Perroud ; that species belongs (as I have subsequently ascertained) 

 to the genus Monolepta. 



4. AuLACoPHORA ARGYROGASTER, Montruuz. Ann. Soc. Ent. France, 

 1861, p. 299. — Anguste oblonga, postice paullo amphata, comexa, 

 sordide flava, subnitida; ore, antennis (basi exceptis) corporeque infe- 

 riore (pedibus anticis anoque exceptis) nigris aut nigro-piceis, abdo- 

 mine sparse argenteo-sericeo ; thorace sat profunde transversim 

 sulcato ; elytris subopacis, tenuiter punctatis. Long. 3^ lin. 



Mas. Abdominis segmento anali trilobato, lobo intermedio profunde 

 concavo ; pygidii apiee extrerao obtuso. 



Fern. Abdominis segmento anali late concavo-emarginato ; pygidii apice 

 acuto. 



Hah. New Caledonia. 



Antennse filiform, basal joint in the S slightly thickened and 

 compressed, clavate ; the third, fourth, and fifth nearly equal in 

 length in both sexes. Thorax nearly twice as broad as long ; 

 sides nearly parallel and slightly sinuate from the base to beyond 

 the middle, thence rounded and converging towards the apex ; 

 upper surface very minutely punctured, the puncturing coarser 

 on the sides ; disk impressed across the middle with a deep 

 transverse sulcation, which in the is broader and more deeply 

 excavated in the middle, the anterior margin of the dilated por- 

 tion being thickened and obsoletely bituberculate ; in the $ 

 the anterior margin of the sulcation (which is of nearly equal 

 depth and breadth throughout) is not thickened nor tuberculate. 

 Elytra oblong, not distinctly excavated below the basilar space, 

 minutely punctured. 



The peculiar sculpture of the thorax in the S and the acute 



