Mr. A. S. Woodward on the Myriacanthide. 275 
Narrow, reddish yellow, shining, rather depressed, nearly 
parallel, upper surface minutely strigose, visible only under 
the microscope; forehead with two oblique sulci between and 
near to the antenne; thorax at the sides slightly sinuate ; 
each elytron has a sutural well-marked stria, which continues 
round the entire wing-case, the other striz are punctate- 
striate, the punctures corresponding with those on the head and 
thorax in being elongate; the pygidium is clothed sparsely 
and irregularly with fulvous hairs, except at the apex, where 
they are rather closely set. The mandibles and mouth- 
organs are darker in colour than the rest of the body. 
I found two examples of this species in June 1881 at Nara, 
near the Kasuga no Miya. One was crawling on a stump of 
a large oak which had been felled about two years before; the 
other was close to it, resting in the orifice of a hole made by a 
wood-borer, with its antennee and mandibles alone protruding. 
At the least disturbance it retired out of reach, and a man 
had to be sent to the village for a large axe, and eight or ten 
inches of hard timber had to be cut away before it was cap- 
tured. It seems to me that these insects must enter a hole 
head first and go to the end of it, where perhaps a cell widens 
out and within which the beetle can turn and retrace its steps. 
The structure of the body suggests that it can almost double 
itself up, and such a form seems compatible with reversing its 
position in a very small space. It could not turn round in 
the hole where it rested, as its own girth was nearly the size 
of the bore in the wood, and I cannot believe that it enters 
the hole backwards. Facts connected with wood-boring 
Coleoptera, and those which follow in their tracks, lead up to 
some of the most interesting problems of natural history. 
Yote—I find that the name Renta, proposed by me (Ann. 
& Mag. Nat. Hist. (5) xv. p. 467, 1885), is used in Lepido- 
ptera; I wish therefore to substitute Reninus for my genus. 
The two names will come close together in an alphabetical list. 
XXX VI.—On the Myriacanthide—an Extinct Family of Chi- 
meroid Fishes. By A. SmirH Woopwarp, F.G.8., 
F.Z.S8., of the British Museum (Natural History). 
AmonG the Mesozoic Ichthyodorulites still awaiting elucida- 
tion is a remarkable spine, frequently met with in the Lower 
Lias of Lyme Regis, described by Agassiz under the name of 
Loe 
