426 Mr. G. W. Kirkaldy on the Revision of Notonectide. 
has generously added to my collection. There is, in these, 
a decided reversion from leucochroism. ‘The greater part 
of the apical margin (base auctt.) and the centre of the 
scutellum are dark brownish-black, and the hemielytra 
are much more marked (though rather obscurely) with 
brownish-black than the typical forms. It is most 
interesting that the membrane lobes of this var. are 
unequal, as in the type-forms. 
Hab. Frxtanp, Tammati (Sahlb. coll.) and Jaakkima 
(my coll.) 
UNRECOGNIZED SPECIES. 
1. N. alba, Forskal, 1775, Descr. Anim. Orient., 
p. xxii. Alexandria. ? Anisops producta. 
2. N. atomaria, Pallas, 1771, Reise Russ. Reichs, i., 
p- 469; Gmel., 1789, in Linn. Syst. Nat. Ed., 
xili., p. 2119. Volga at Novgorod. ? Plea 
minutissima. 
3. N. australis, Ol., 1811, Encyc. Meéth., viii., p. 389. 
Australia (Bose colln.).  ? Anisops. 
4, N. grisea, Ol., 1811, 1. c. San Domingo. ? Ani- 
sops ; ? N. undulata. 
5. N. unifasciata, Guér., 1858, Bull. Soc. Zool. Acclim., 
iv. p. 581. Mexico. ? N. undulata. 
I had hoped to give an account in this paper of the 
metamorphoses of N. glauca, L. Unfortunately my 
attempts at rearing this species from the ova during 
two seasons have been only partially successful. I have, 
however, reared three larval instars from ova deposited 
in captivity, and am aware of two more, so that Notonecta 
has at least five larval instars. In the ultimate and 
perhaps also the penultimate larval stage, the species can 
always be determined by the structure of the head; in 
the first three, however, the shape of the head and eyes 
does not resemble the adult at all, but is more akin to 
that of Corixa, and the entire form of the insect in these 
stages is very different from that of the adult. 
1 hope to be able to give fuller particulars at a later 
ate. 
