Rey. H. Clark on new Australian Phytophaga. 253 
In facies these insects, which seem to me to require the erection 
of a separate genus, are clearly allied to Rhyparida of Mr. Baly ; 
but while they have a remarkable constancy of form inter se, they all 
manifestly diverge from the form of R. grandis, and also from the type 
form of R. dimidiata. The following species are narrower, slightly 
more cylindrical, the upper surface not so depressed; the elytra are 
parallel, not attenuated towards the apex, and not much broader 
than the base of the thorax (those of Rhyparida grandis being at 
least one-third broader than the thorax) ; in no case is the form of 
the thorax transverse as in 2. dimidiata, it is quadrate or subqua- 
drate as in 2. grandis, but differs from that species in its sides being 
rounded or almost angulated, and not straight and parallel. 
Type, M. Didymus, Fab. (Cryptocephalus) Syst. Eleut. 11. 43. 11. 
(Type in Brit. Mus.) 
1. M. vittatus, Blanch. Voy. au Pole sud, iv. p. 327. 19, 4. 
This is apparently a common as well as variable species found 
throughout the northern regions of Australia. It has been received 
by Mr. Bakewell, Mr. Baly, and myself from our correspondents. 
2. M. wigro-cyaneus, n. sp. 
M. sat robustus, parallelus, punctate striatus, nigro-cyaneus, nitidus ; capite 
verticali, inter oculos ad medium longitudinaliter foveolato: thorace 
late ad latera rotundato et leviter marginato, sparsim et minute punc- 
tato ; scutello plano, magno, subcordiformi: elytris robustis, parallelis, 
humerorum angulis e thorace sejunctis, fortiter punctate striatis : cor- 
pore subtus, pedibus antennisque nigris. 
Long. corp. 4 lin., lat. 2 lin. 
Not uncommon, probably, in New South Wales. In the collections 
of Mr. Baly, Mr. Bakewell, the Rev. T. A. Marshall, and the Rev. H. 
Clark. 
3. M. rufus, n. sp. 
MW. oblongus, sat parallelus, robustus, punctate striatus, nitidus, fusco- 
rufus vel rufus; capite verticali, antice rugoso, inter oculos longitu- 
dinaliter foveolato; thorace subquadrato (in ¢ attenuatiore), ad latera 
antice et pone valde constricto (ad medium rotundato-angulato), late- 
ribus tenuiter marginatis, disco subtilissime punctato, scutello magno 
subcordiformi; elytris thorace paulum latioribus, humeris anticis pro- 
minulis, fortiter punctato-striatis; corpore subtus rufo ; pedibus nigris, 
femoribus ad basin aliquando rufo-nigris; antennis nigris. 
Long. corp. 33 lin. ; lat. ¢ 14%, 9 2 lin. 
I have before me the two sexes of this species: the male is slightly 
smaller, narrower, and more compact ; the thorax is narrower in pro- 
