X. Descriptions of some new exotic species of Lucanide. 
By J. O. Wzstwoop, M.A., F.L.S., &c. 
[Read Ist May, 1871.] 
By the kindness of Dr. Howitt of Melbourne, and Major 
F. J. Parry, I am enabled to offer to the Entomological 
Society, descriptions and figures of a number of new 
species of this interesting family, by way of further sup- 
plement to the different articles which have appeared, 
from time to time, in the Society’s Transactions, upon 
these insects. 
The great additions which have been made, to our 
knowledge of this group during the last twenty years, 
have rendered necessary the breaking up of the old 
genera Lucanus and Dorews into minor groups, or sub- 
genera, and the most interesting species to be described 
in this communication is sufficiently distinct from pre- 
viously separated groups, as to render necessary the 
proposal of another, with the name :— 
Ruztoutvus (Parry, MS.). 
Corpus oblongum, subdepressum. Caput et pronotum 
sub lente granulata subopaca; elytra parum nitida punc- 
tatissima. Labrum porrectum transversum, in medio 
marginis antici paullo angulato-productum ; mandibulz 
magne, curvatee, contorte ; antenne long, clava 3-arti- 
culata. Pedes longi, tibize 4 posticee in medio 1-calcaratae. 
Prothorax lateribus crenatis haud spinosis. 
Species unica, RH£ZXTULUS CRENATUS, mas. 
(Plate VIII. fig. 4.) 
Piceo-niger, elytris magis castaneo-nigris ; mandibulis 
capite duplo longioribus, valde curvatis, et in medio ele- 
vatis, apicibus depressis fortiter bifidis, margine antico 
vel supero basin versus dento parvo conico erecto, et in 
medio denticulis numerosis obtusis, armato; pedibus 
antennisque nigris, tibiis anticis denticulis circiter 14 in- 
structis. 
Long. corp. lin. 15; mandib. lin. 6. 
Hab.—In Insula Formosa. In Mus. Parry. 
TRANS. ENT. soc. 1871.—parT WI. (AUGUST-) 
