British Species of Agathidium. 449 
of the antenne black ; these are short and with the third joint not 
so long as the two succeeding. The head is very sparingly and 
obsoletely punctured, the punctures more evident behind the 
eyes. The clypeus is depressed, so as to leave the front of the 
head emarginate. Thorax rather narrower than the elytra, its 
sides faintly and sparingly, the disc extremely finely and obsoletely 
punctured. Elytra with the humeral angles well marked but very 
obtuse, sparingly and finely punctured, with a sutural stria ex- 
tending more than half-way. In the male the left mandible is 
produced into a long pointed horn. 
This species is perhaps the A. piceum of Erichson, but the 
humeral angles seem to be not so rectangular as the description of 
that species would lead one to expect. Moreover Erichson says 
nothing of the remarkable emargination of the head behind the 
mandibles. 
Found by Mr. Janson on fungi in Headly Lane, Mickleham, 
some years ago, and by Mr. Bold in Northumberland. Dr. Power 
has also captured a single specimen at Headly Lane: this was 
supposed to be 4. mandibulare, Sturm, a species of which I have 
seen no British example, and which must, I am afraid, be (at any 
rate for the present) erased from our lists. 
7. Agathidium rotundatum, Gyll. 
Black, the sides of the thorax, legs and antenne pitchy ; club of 
the latter black, with the apex sometimes lighter; head and 
thorax very finely punctured, the punctuation on the disc of the 
latter being very obsolete; elytra with a well-marked sutural 
stria, extending beyond the middle, pretty thickly and finely 
punctured, the punctures being more evident towards the apex 
and sides. Of the male there are two well marked forms. In 
one the left mandible is armed with a straight pointed thorn-like 
horn reclining on the head. In the second this mandible is merely 
a little thickened and curved. In both of these forms the anterior 
and middle tarsi are slightly dilated and there is a small bunch of 
hairs springing from the metasternum. 
Long. % lin. 
Common in the North of England and Scotland under the ‘bark 
of fir stumps; the more developed form of the ¢ seems to be 
rare. The smallest of our British Agathidia, small males of A. 
marginatum alone being equally diminutive. 
8. Agathidium convexum, nov, sp. 
Nigrum, nitidum, prothoracis limbo piceo ; antennis pedibusque 
rufis ; capite equaliter punctulato ; prothoracis disco obsolete, 
