178 
MR. J. S. BALT ON SOME GENERA 
flavous. Thorax twice as broad as long; sides diverging an$ 
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 AulacopJiora , I have alluded to as palustris, 
Perroud ; that species belongs (as I have subsequently ascertained) 
to the genus Monolepta. 
4. Aulacophora argyrogaster, Montrouz. Ann. Soc. Ent. France, 
1861, p. 299. — Anguste oblonga, postice paullo ampliata, 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 apice extremo obtuso. 
Fem. Abdominis segmento anali late concavo-emarginato ; pygidii apice 
acuto. 
Sab. New Caledonia. 
Antennae filiform, basal joint iu the <S slightly thickened aud 
compressed, elavate ; 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 aud 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 aud 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 
