254 
of this pygmy turning out to be an extreme form of P. optata, 
Shp., but among half a dozen typical specimens of the latter I 
have seen none intermediate. The striking difference between 
this species and P. optata and variolicollis is the small size of the 
excavation of the prothorax (which does not reach back beyond 
the middle of the segment) its having at the middle of its hind 
margin only a minute tubercle; and the rough sculpture of the 
prothorax being continuous over the whole surface except a 
thinly punctulate area running along the middle of the excavated 
portion. The examples before me are undoubtedly males. 
N. Queensland ; sent by Mr. Cowley. 
P. Bovilli, Blackb. I have received from Mr. Cowley a speci- 
men taken in N. Queensland which I believe to be the male of 
this species. It is very large (long., 13:1.) and differs from 
P. optata, Shp., in its frontal horn being much shorter and 
resembling a triangular lamina with the apex bent hindward, in 
its prothorax almost punctureless (there are a few subobsolete 
punctures in the hind angles), in its prothoracic excavation very 
wide but only reaching back to the middle of the segment and 
having three strong pointed tubercles along its hind margin, and 
in the median opaque stripe on its propygidium occupying nearly 
the whole width of the segment so that only the extreme mar- 
gins of the segment are less minutely sculptured. 
NEOCAVONUS. 
C. bidens, sp. nov. Sat nitidus; piceo-rufus, elytris nigris ; sub- 
tus fulvo-hirsutus ; elytris fortiter punctulato-striatis, striis 
vix geminatis, interstitiis fere leevibus. 
Maris clypeo subverticali fortiter transverso vix manifeste 
punctulato, antice rotundato, basi fortiter carinato, margini- 
bus fortiter reflexis ; prothorace quam longiori sesquilatiori, 
antice late retuso, in margine anteriori tuberculo magno 
bifido armato, antice sat crebre subfortiter (postice minus 
distincte) punctulato; pygidio sat fortiter (antice et ad 
latera quam in ceteris partibus magis crebre) punctulato. 
Fem. a mari differt prothorace equali, antennarum clava 
quam ceteri articuli conjuncti paullo breviori, segmento 
ventrali apicali haud emarginato, tarsis posticis brevibus. 
Long., 6 1.; lat., 34 1. 
Easily distinguishable from its described congeners by the 
strongly bifid tubercle on the front margin of its prothorax. 
S. Australia. 
PIMELOPUS. 
The following characters in combination distinguish Pzmelopus 
among the Australian Dynastides,—viz., clypeus straight on 
