256 
HORN EXPEDITION—COLEOPTERA. 
STERNOLOPHUS. 
7 ii/idnlus, Mad. (35), Painta Spring, Palm Creek, Bagot’s Creek, Carmichael 
Creek, Ellery Ci’eek, Glen Helen, Deering Creek, Illara Water. I see no 
reason to doubt the identity of these specimens with Macleay’s insect although 
the original description is a very insufficient one, as I have examples from Queens¬ 
land (Macleay’s locality) in my own collection from which these Central Australian 
examples are quite indistinguishable. The sexes differ in the male being of 
narrower form, with the sternal carina slightly more produced, the palpi a little 
more elongate, and the apical ventral segment minutely notched at its apex. 
HYDROBIUS. 
H. assimi/is, Hope (14), Adminga, Macumba Creek, Ellery Creek, Bagot’s 
Creek, Illara Water, Storm Creek, Carmichael Creek. I have already (Proc. 
Linn. Soc. N.S.W., 1888, p. 818) discussed the identity of this insect with 
H. assimilis, Hope, and am still of the opinion there expressed that it is very 
doubtful. But as this is the insect commonly x’egarded as H. assimilis, I give it 
the name provisionally. 
HYDATOTREPHIS, 
H. Mastersi, Mad. ? (4), Bagot’s Creek. This insect agrees well with 
Macleay’s description and therefore is presumably his species ; but it is possible 
that a comparison with the type might indicate differences. I have found this 
insect in Victoria. The type of H. Master si was taken in Queensland. 
PARACYMUS. 
(Subg. Paranaceena). 
P. Spenceri, sp. nov. (4). Nitidus; niger, palpis (apice excepto) antennis 
(clava excepta) prothoracis lateribus (basi excepta) elytris (his hie illic indetermi¬ 
nate infuscatis) pedibusque testaceis; supra subtiliter sat confertim punctulatus; 
puncturis in elytris nullo modo seriatim dispositis; his (stria suturali antice 
abbreviata excepta) baud striatis. Long. 1 1. Lat. | 1. 
This little species (if its colour is constant) may be readily distinguished by 
its head and prothorax being brilliantly black (except the front part of the 
declivous sides invisible from above of the latter) in contrast with the testaceous 
and brown elytra. The only described Austi’alian species of the genus at all 
approaching it in colour is P. Lmdi, Blackb., from which it is distinguished by its 
