108 
the third abdominal segments have small irregular longitudinal ruge ; 
the remaining two abdominal segments are finely punctured. 
Nycretia Sourert. Nyct. ovata, nigra, nitida ; capite antice punc- 
tato, postice levi; thorace transverso, elytris angustiore ; angulis 
posticis productis, supra apud medium pauld convexo, et levi ; ely- 
tris antice apud plagam suturalem leviter impressis, et sulcis 
transversis paulo irregularibus a margine laterali fere ad suturam 
ductis. 
Long. corp. 11? lin. ; lat. 62 lin. 
Hab. Patagonia. 
This species resembles the N. plicata, but differs in having the 
thorax smooth; the elytra are rather narrower, and the apical pro- 
duced part is shorter and broader; they are scarcely indented at the 
suture, excepting in a slight degree towards the scutellum; the 
transverse folds are less regular, often dividing into two branches, 
and approach more near to the suture. A transverse section of 
the elytra of N. plicata would present a convex upper surface near 
the suture, but at the part where the grooves commence the line 
would be straight (though sloping downwards to the lateral keel), 
or even slightly concave; whilst in N. Soliert a similar section 
would present an even convex curve. Scattered punctures are ob- 
servable on the fore-part of the head, and a shallow transverse de- 
pression is situated between the eyes; the thorax is nearly twice as 
broad as long, convex in the middle, but slightly concave towards 
the lateral margins: with a moderately strong lens some minute 
punctures are visible, rather thinly scattered over the surface. The 
elytra are ovate, the length to the width bearing about the propor- 
tion of 7 to 9. 
Nycrezia Darwinit. Nyct. brevitér ovata, conveva, nigra, nitida ; 
capite subpunctato ; thorace pauld ad partem anteriorem quam 
posticam angustiore, levi, convexo ; elytris subrotundatis, valde 
convexis, levibus, marginibus lateralibus crenulatis. 
Long. corp. 112 lin.; lat. 8 lin. ; vel, long. 11 lin. ; lat. 73 lin. 
Hab. Port Desire. 
This species is remarkable for its broad and very convex form and 
deficiency of sculpturing, having the upper surface of the thorax and 
elytra smooth and glossy. The head is finely punctured : the thorax 
is twice as broad as long, and convex; a groove runs parallel with 
and close to the lateral margins, and a similar groove is observable 
on the anterior margin, though here it is less strongly marked. 
Elytra rather more than one-third broader than the thorax, and the 
length and breadth are very nearly equal, if we exclude the produced 
apical portion, which is broad, depressed, and nearly of a semicircular 
form. The lateral keel is distinctly crenulated, and separated by 
an adpressed line. The underside of the thoracic segments are ru- 
gose in the middle, and the first and second abdominal segments 
have irregular longitudinal ruge ; the third segment presents a faint 
trace of similar ruge at the base ; the other segments are smooth. 
