182 INSECTS OF SAMOA. 



. 



EUMOLPINAE. 



Stygnobia Weise. 



Stygnobia Weise, Archiv fur Naturgesch. Ixxxviii, Abt. A., Heft 10, pp. 154, 155, 1922. 



This genus was founded by Weise for three specimens collected in Upolu, 

 in March, 1913, by Dr. K. Friederichs. Two of these Avere described as repre- 

 senting one species, and the third as belonging to another. Through the courtesy 

 of Dr. Walther Horn, of Berlin, I have been able to make an examination of 

 these types, as a result of which, and in view of the fact that I have before me 

 a large number of individuals of four species of this genus, a modification of the 

 generic concept is necessary. I therefore redescribe the genus as follows : 



Body oblong, ovate, somewhat convex, completely covered with hairs, 

 although on the under side the hairs are very fine and sparse. Antennae eleven- 

 segmented, the fourth segment being the longest. Prothorax broader than long, 

 somewhat narrowed in front, sides marginate. Elytra confusedly punctate. 

 Under side : presternum narrowed between coxae. Anterior margin of pro- 

 thoracic episternum subconcave. Legs long, slender ; middle and hind tibiae 

 emarginate at apex ; claws divided into two branches, the inner smaller than 

 the outer. 



Genotype : Stygnobia cauta Weise. 



Range : Apparently confined to the Samoan Islands. 



3. Stygnobia aenescens, sp. nov. (Text-fig. 3). 



Body subnitid, oblong, ovate, broadest at base of elytra and very slightly 

 narrowing towards apex ; general colour very dark pitch brown, almost black, 

 with bronzy reflections. Pronotum often darker than elytra ; legs lighter brown, 

 femora and tibiae at their bases and apices with dark rings, varying in intensity 

 and extent. Colour of under side identical with that of upper side, either 

 extending uniformly over entire surface, or darker in some parts than in others. 



Head somewhat exserted, with apex convex and frons slightly depressed ; 

 upper surface very roughly sculptured, the interantennal and interocular 

 spaces closely covered with deep punctures, which, coalescing on the apical area, 

 form channels alternating with ridges. Eyes convex and entire. Antennae 

 extending to about middle of elytra ; first segment long and thickened, second 



