JAN. — MAR. 1857.] Descriptiomof new CeylonCoIeoptera. 191 
ously drawing attention to the three very natural and very distinct 
groups which they form and the characteristics of which will at 
once be perceptible from the headings given below. With regard 
to the first group (A. I. spec. 30-34) I may mention that the elon- 
gated legs, largely developed posterior trochanters and often distant 
posterior coxso give the insects belonging to it a staggering motion 
when walking,which together with their oblong,subdepressed body 
distinguishes them at a glance. I have subdivided them from the 
cultriform or grooved mesosternal CfU'ina. The second group (A. II. 
spec. 35-41) is equally well characterized as the former by the 
more robust, pyriform and Subconvex body of the insects. S. psela- 
phoides in the former anr^ S. advolans in the present group, form 
connecting links between the two, especially S. pselaplioides which 
in general appearance rather belongs to the second, upon closer 
examination however is easily ascertained to be an anomalous mem- 
ber of the former. I have divided the second group into two 
subdivisions distinguished by the rounded or narrowed occiput giv- 
ing preference to the distinctions to be drawn from this part of the 
body rather than to those derived from the thorax, which from the 
variety of shapes it assumes would naturally suggest itself for that 
purpose, but the gradations between the principal forms appear to 
me too many, too fine and therefore too indistinct to adopt them. 
As to the third group (B. spec. 42) the insect which alone forms it 
amongst those described below, is so different from any of the 
others that its peculiarities must strike any one at first sight. 
A. Species ivith a thick neck^ abruptly formed and immersed in the 
thorax. 
I. Fourth joint of the ^naxill. palpi not acuminated ; head suhqua- 
drato — ovate; eyes middling or small ^ finely granulated, little or not 
at all prominent; antennae subapproximate at the base ; posterior 
trochanters elongated, incrassated at the apex ; thorax obovate ; 
body elongate, siibdepressed. 
(a.) Mesosternal carina slight, simple. 
30. Scydmcenus. alatus. N. 
S. dilute brunneus, pedibus antennisque dilutioribus, tarsis pal- 
pisque testaceis ; pubescens ; long. corp. | lin. 
