Xl 
“Genus THroscus. 
I. Eyes with an oblique central groove in front only. 
Sp. 1. 7. dermestoides, L., Latr., Steph., Heer, Redtb., v. Kiesenw., de Bony. 
(Elater dermestoides, L.) 
Forehead with two distinct parallel longitudinal ridges in front between the eyes, 
and a very short indistinct one between them. 
Thorax scarcely perceptibly dilated at the sides in front of the posterior angles, 
finely and somewhat thickly punctate. 
Elytra punctate-striate, all the striz distinet; the interstices with two irregular 
series of sparsely disposed punctures anteriorly, which gradually assume the 
position of a simple row posteriorly. 
II. Eyes with an oblique central groove running completely across them. 
Sp. 2. 7. elateroides, Heer, de Bony. 
Forehead with two fine parallel longitudinal ridges in front between the eyes. 
Thorax conspicuously dilated at the sides in front of the posterior angles, finely 
and rather thickly punctate. 
Elytra finely punctate-striate, the striae next the suture obsolete; the interstices 
thickly and finely punctate. 
The frontal ridges are, in some individuals, so faintly raised as to be distinguish- 
able only in a good light and in thoroughly clean specimens. 
Sp. 3. 7. obtusus, Curt., Steph., v. Kiesenw., de Bony. 
Forehead convex, scarcely perceptibly punctate, and without the faintest trace of 
longitudinal ridges. 
Thorax very short, and very much dilated at the sides in front of the posterior 
angles, sparsely punctate. 
Elytra finely punctate-striate, the striae next the suture usually very faint; the 
interstices somewhat thickly and minutely punctate.” 
Mr. W. W. Saunders exhibited a singular conical nidus, which he considered to be 
that of a spider, from New South Wales, formed out ofa single leaf, by a series of folds, 
so artfully contrived that the whole of the leaf was used up in its construction, 
producing a tent-like structure quite impervious to wet; the nidus was about half an 
inch in length and nearly the same in diameter at the base. 
Mr. Saunders also exhibited two cases formed by the larve of some species of Gceti- 
cus (Oiketicus)?, about two inches in length, constructed of four series of small pieces of 
the culm of some kind of grass; these four series were of different lengths, increasing as 
the larve appear to have grown larger and required a more roomy habitation: in each 
Series the pieces of culm were very nearly equal in size and length, and so arranged 
as to form a cylinder. These cases had somewhat the shape of a pocket-telescope 
drawn out to its full length: they were from New South Wales. 
