108 
DR. W. E. COLLINGE ON TWO 
there were four new species of Alloniscus \ these Bud Je-Lund placed in a 
new genus, Diacara, for reasons which are not altogether clear ; there are 
certainly slight differences in the form of the uropods, but these are scarcely 
sufficient to warrant generic distinction. In 1908 (4) Budde-Lund published 
his memoir on the Isopoda of Madagascar and East Africa, in which he 
described and partly figured nine further new species, re-describing and 
partly figuring other known forms. No figures, however, are given of 
Periscyplwps pra'conius and Armadillo horridus. According to this author, 
there are known from Madagascar thirty-two species referable to twenty 
genera. 
If, as is generally supposed, Madagascar represents a part of a great sub- 
merged southern continent, then we should expect to find representatives of 
Soutli-Eastern and South-Western genera, but whether owing to long isolation 
these forms have changed or died out, it is remarkable that the bulk of the 
known forms show affinities rather with Northern forms than with Southern 
ones, and they further seem to have little relationship with the South African 
genera. Hitherto no genus has been found peculiar to Madagascar; the new 
genus Calmanesia, here described, is therefore of more than usual interest. 
Until, however, we know much more of the fauna of this island, it is futile 
to speculate. 
III. Description of Alloniscus nacbeus, sp. nov. 
Alloniscus, Dana. 
This genus as yet is only imperfectly understood, and the members are 
subject to a wide range of variation. It occurs in North and South America, 
India, Siam, the Malay Peninsula, South Africa, Sumatra, Java, and the 
Maldive, Hawaiian, Nicobar, and Celebes Islands. Arhina, Collge. (6) is 
a closely-allied genus from India. 
Of the twenty-one described species of Alloniscus, seven are known to 
occur in Madagascar, viz.: ^4. alluaudi, Dollf., A. elegans, Dollf., A. guttatus, 
Dollf., A. tigris, Dollf., A. brevis, Budde-Lund, A. pallidulus, Budde-L., 
and A. pigmentatus, Budde-L. 
Alloniscus naceeus, sp. nov. (PI. 9. figs. 1-12.) 
Body broadly oval, strongly convex, irregularly pitted, finely sculptured 
on each side of the mesosome. Cephalon (figs. 2 & 3) medium size, convex 
above, frontal margin distinct, lateral lobes small ; epistome slightly de- 
pressed, with prominence between the antennse. Eyes oval, dorso-lateral. 
Anteunulse (fig. 4) small, curved, and 3-jointed, the terminal joint with 
a number of bristle-like setae on the inner side. Antennte (fig. 5) short, 
joints gradually enlarging from the 1st to 4th, 5th joint elongated and more 
