Genera and Species of Coleoptera. 459 
Byrsax* Macleayt. 
B. oblongus, fuscus; capite maris cornibus elevatis, apicem versus in- 
curvatis et decussatis; prothorace tuberculato, disco 4-tuberculato ; 
elytris subdisperse punctatis, tuberculis magnis subseriatim positis. 
Hab. Australia. 
Oblong, dark brown, opake ; head of the male armed with two long 
stout vertical horns, incurved and crossing each other at the tips, the 
tips themselves emarginate or reduced in thickness ; head of the female 
with a simple tubercle between the eyes; prothorax finely punctured, 
very tuberculate, four principal tubercles on the disk towards the base 
arranged in pairs (::), in the female two others at the extreme apex, 
much produced, slightly recurved and transversely compressed ; elytra 
somewhat coarsely punctured (the punctures rather depressed), tuber- 
culate, four principal tubercles oblong and very large, on each side of the 
suture; between these and the margin on each side three slightly irre- 
gular rows of smaller and rounder tubercles ; body beneath and legs 
reddish brown ; mesosternum with a very compressed vertical process ; 
. club of the antennze 7-jointed. Length 5 lines. 
The genus Byrsaw was proposed by me in the first number of this 
Journal (April, 1860), and differs from M. Motschoulsky’s Boli- 
towenus (¢ Etudes, &e.,’ 1858, p. 63), in that the elytra have a produced 
margin, which is always coarsely serrate, and the prosternum is keeled 
anteriorly. Byrsax was there, in consequence of its tarsi appearing 
to me to be tetramerous, referred to the Colydiide ; at the same time 
I pointed out its resemblance to Diaperis horrida, Ol. (a true Byrsax), 
but stated that, “‘ guided by its tetramerous tarsi,” its real affinity 
would be with Endophleus, Pristoderus, and some other genera. I 
am now satisfied that it is truly heteromerous, the basal joint, indeed, 
being completely hidden in the cotyloid cavity of the tibia. I am not 
so satisfied, however, that the resemblance between it and the above 
Colydiide genera is only one of analogy. Bolitophagus gibbifer, Wes- 
mael, is possibly identical with Byrsax ceenosus. There are, how- 
ever, several other undescribed species. 
Byrsax egenus. 
B. oblongus, indumento terrulento fulvescente tectus; prothorace gibboso, 
disco 8-calloso, callis tuberculatis; elytris subseriatim callosis. 
Hab, Australia. 
Oblong, covered with a fulvescent tomenticious substance ; head with 
four tubercles between the eyes, and two on the clypeus; prothorax 
very gibbous, the disk with four large callosities anteriorly, each ap- 
parently made up of three or four conical tubercles, and four smaller 
* Pascoe, Journ. of Entom. i. p. 42. 
VOL, Il. 21 
