44 Mr. C. O. Waterhouse on new Madagascar Coleoptera. 
impressa; antennis crassis, pedibus obscure piceis hic et illic vio- 
laceo tinctis. @. 
Long. (rostro excl.) 6 lin. ; 
In the ‘Transactions of the Entomological Society ’ for 1877, 
p- 11, I described a species under the name of D. olivaceus 
from two examples which I believed to be sexes. The species 
now described is founded on what I then considered to be the 
female. I have now before me from Fianarantsoa a small 
female, which only differs from the male in_ having the an- 
tenn much shorter, the general form and colour of the male 
and female being very similar. The female example, there- 
fore, originally described must be considered a distinct species, 
differing in having the rostrum relatively longer, the length from 
the front of the eye to the base of the mandible being equal to 
the greatest width of the head, whereas in D. olivaceus ( 2 ) 
this part of the rostrum is much less than the width of the 
head. The antenne in D. olivaceus are very slender to the 
sixth joint; in D. crassicornis they are thick and gradually 
become a little more so towards the club. The fore part of 
the prosternum is densely transversely strigose and punctured ; 
in D. olivaceus this is scarcely observable. 
Diastotropis planifrons, n. sp. 
Olivaceo-niger, opacus, squamis minutissimis dense tectus; fronte 
et rostro planatis, creberrime punctatis; thorace elongato, antice 
et postice paulo angustato, confertim subtilissime punctato, postice 
linea vix elevata arcuata instructo ; elytris thorace duplo longiori- 
bus, convexis, ad apicem arcuatim angustatis; antennis (apice ex- 
cepto) pedibusque obscure piceis. Q. 
Long. 7 lin. 
Rostrum one quarter broader than long, flat, without any 
ridges. Space between the eyes very wide. ‘Thorax a little 
longer than its greatest width, which is rather behind the 
middle, evenly convex, gently narrowed in front and behind ; 
the sides not distinctly angular at the widest part. Hlytra at 
the base straight, much broader than the base of the thorax ; 
very convex, gradually declivous at the apex, with a black 
velvety stripe on the suture from the middle to the apex; in 
some positions lines of distant punctures may be seen. An- 
tenn the length of the thorax, the second to sixth joints 
slender; the seventh and eighth a little wider at their apex; 
club black. Legs shining ; tibize with delicate pubescence. 
This species is narrower than D. olivaceus, which it resem- 
bles somewhat in colour. The absence of any ridges on the 
rostrum separates it from all its allies. 
