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punctures; the mesosternum and metasternum have irregular ruge, 
and the three first abdominal segments have minute longitudinal 
furrows; the penultimate segment is smooth, and the apical one is 
finely punctured, but the punctures are by no means numerous. 
The legs and antenne are rather shorter than usual in the genus. 
Nycrerra Sreruensi. Nyct. atra, nitida, levis ; thorace subqua- 
drato; elytris rotundato-ovatis, convexis, carind laterali promi- 
nenti et crenulttd ; elytrorum apicibus productis latis et subcom- 
planatis. 
Long. corp. 7 lin. ; lat. 43 lin. 
Hab. St. Cruz. 
Head with scattered punctures in front. Thorax transverse, the 
width being rather less than double the length ; the upper surface is 
but little convex; the anterior and posterior margins are nearly 
straight, but the anterior angles are produced and the posterior an- 
gles are slightly produced. The width of the fore and hind parts 
of the thorax is nearly equal, it being but slightly narrower in front, 
and the sides deviate but little from a straight line; a faint dorsal 
channel is observable, and a groove runs parallel with and close to 
the lateral and anterior margins. With the assistance of a strong 
lens, minute punctures may be observed scattered over the upper 
surface of the thorax, and some minute tubercles on the under. 
The elytra are convex, and of a short rounded form, the width and 
length being very nearly equal, if we do not include the produced 
apical portion, which is more dilated than in most of the genus, and 
is nearly flat. A groove runs close to and parallel with the lateral 
keel, both above and below, and this keel is distinctly crenulated. 
The upper surface of the elytra presents numerous indistinct and very 
shallow fovez. The abdominal segments are almost smooth. The 
legs are proportionately rather longer than in N. levis. 
Mr. Darwin found this species at St. Cruz in the month of April. 
Nycrezia Newrortu. Nyct. elongato-ovata, nigra, nitida ; capite 
transverse impresso ; thorace lato plus quam longo, lateribus rotun- 
datis; antice et postice latitudine compari; superne minime convexo, 
impunctato, ad latera rugis parvulis obliquis ; elytris ovatis, levi- 
. bus, plagd suturali valdé impressis, marginibus lateralibus crenu- 
dati. 
Hab. Patagonia. 
Long. corp. 10 lin.; lat. 6 lin. ‘ 
This species is rather smaller than N. levis, and differs moreover 
in being of a more eiongated form, and most especially in the form 
of the thorax, which is narrower and nearly equal in width, in front 
and behind : the apical portion of the elytra is much less produced, 
and the produced portion is broader. The head is sparingly punc- 
tured at the sides, and has a curved impression, the chord of which 
is rather in front of the insertion of the antenne. The thorax nearly 
one-third broader than long (taking the length from the anterior 
and posterior angles); it is broadest in the middle, and a trifle nar- 
