115 
series is indistinct: the lateral keel is distinctly crenulated. The 
mentum is distinctly punctured ; the prosternum, as well as the other 
thoracic segments, and the abdominal segments, have the usual 
sculpturing, but it is less strong than usual. 
It is with some hesitation that I name this insect, since it ap- 
proaches very near to the N. Newportii; it differs, however, in ha- 
ving the thorax smaller and proportionately narrower, the elytra less 
convex, and furnished at the sides with three rows of transverse 
impressions instead of one; the region of the suture is less depressed. 
NYcTELIA SULCICOLLIS. Nyct. ovata, atra; thorace transverso, ad 
latera rotundato, antice angustiore, sulcis minutis longitudinalitér 
impresso ; elytris crebré punctatis (punctis confluentibus), tuber- 
culisque minutis instructis : capite, thorace elytrorumque lateribus 
pilis vestitis, pedibusque etiam pilis instructis. 
Long. corp. 84 lin.; lat. 53 lin. 
Hab. St. Cruz. ‘ 
Much smaller than N. /evis, and of a shorter and more rounded 
form. The upper surface of the head is very thickly punctured 
throughout, and the punctures run into each other so as to form 
irregular ruge. The thorax is twice as broad as long, and has a deep 
and almost semicircular emargination in front; the anterior angles 
are acute, and the posterior angles are obtuse, and not produced as 
in many species of the genus, the hinder margin of the thorax pre- 
senting a nearly straight, or but very slightly waved line: the 
broadest part of the thorax is near the posterior angles, the narrow- 
est part is in front, and the lateral margins are rounded in sucha 
manner that the thorax might almost be described as semicircular, 
and having the fore-part emarginated. The whole upper surface of 
the thorax is covered with small but distinct grooves, leaving convex 
ridges between them about equal in width to the grooves; these 
furrows are longitudinal in their direction, or very nearly so, except- 
ing in the fore-part, where they diverge from the mesial line and 
run up to the anterior margin, and at the sides of the thorax, where 
the grooves are irregular, but have a tendency to a transverse dispo- 
sition. The under side of the thorax presents similar longitudinal 
grooves, excepting in the middle, where it is rugosely punctured ; 
scattered hairs cover this under surface of the thorax; and towards 
the lateral margin the hairs, which are moderately long, are much 
more numerous and form a projecting fringe, which is visible when 
the insect is viewed from above. The elytra are of a short ovate 
form, about one-fourth broader than the thorax, and scarcely one- 
fifth longer than broad ; the apical portion is but little produced: 
the upper surface is convex, and is thickly covered with small con- 
fluent punctures, amongst which minute tubercles are scattered; 
towards the lateral keel, which is very little prominent, the tubercles 
are distinct. The sculpturing of the portion of the elytra beneath 
the keel resembles that above it, but here the tubercles give origin to 
small hairs*. The meso- and metasternum present irregular ruge. 
' * Probably similar hairs originally sprang from the tubercles on the 
upper surface, but have been worn off. 
