XXIV 
3. Rarely brachypterous. Clypeus elongate. Head not channelled beneath 
: 15. Anthocoridae. 
3a. Always strongly praehy pinnae ined: sliort or apparently absent. Head 
more or less channelled beneath . . . 2 Al) Se) 
4. Not furnished with comb-like fringes , aS senivared hairs. Eyes well 
developed . . . : ue ee PACD) 
4a. Furnished with comb- Tike fees "Eyes inbeent ? “47. Polyctenidae. 
5. Coxae short, somewhat remote . . .-.- . + - 16. Clinocoridae. 
ba. Coxae rather elongate, subcontiguous . . . . .18. Aépophilidae. 
Superfamily 4. Notonectoideae. 
1. Antennae free and more or less conspicuous . . ay Paral) 
1a. Antennae concealed, usually in foveae on the aaderee of the head. 
Nymphs lacking odoriferous orifices 9. 0% ) =o ee) 
2. First segment of antennae reaching well havea he one of the head ; 
membrane-cells lacking cross veins; nymphs with orifice on 4th feneitel 
Aad Se, Cent Pas ne eae < 21. Acanthiidae. 
2a. Second segment of antennae not ee as far as the apex of the 
head; membrane-cells with ee nymphs lacking orifices on 
(ites sat ear: . . . 22. Ochteridae. 
3. Fore legs eerie + on, or near hs, ae margin of the prosternum (4) 
3a. Fore legs inserted on the hind margin of ie prosternum. . . (5) 
4. Antennae more or less simple. Legs not, or scarcely, flattened. Wings 
not reticulate. Ova laid on leaves, etc. of water plants. 
_ 23. Nancoridae (including Mononyx, ete.) 
Aa. Reatenrtac) ents eodined: Legs strongly flattened. Wings more or less 
reticulate. Ova laid on the back of the male. . 24. Belostomidae. 
5. Labium composed of two segments at most. The forms swim on their 
bellies. Ova laid externally . . . . . . 25, Corixidae. 
5a. Labium free, composed of 3 or 4 sega. Forms swim on their backs. 
Ova inserted in stems, etc. of water- plants . . 26. Notonectidae '). 
# * 
* 
Bibliography. 
; z have enumerated, after the titles of Families, Subfamilies etc., the 
principal works dealing with each. I now mention the principal general 
works ; which those who are not, yet familiar with Hemipterous literature, 
will find it advantageous to consult at the commencement of their studies. 
1. Hahn and Herrich-Sehiiffer: Die wanzenartigen Insekten. 9 vols. 
1831— 1853. 
This is now principally useful for the 8324 Plates, 
mostly coloured. Some of the figures are good, but athews 
are daubs. 
of 2. Sata : “Recherches anatomiques et physiologiques sur les hémi- 
pteres....”, 1834 Mém. sav. étrang. Ac. Sci. France IV. 129—462, Pls. 1 —19. 
This is still the only general work on the subject 
1) 1 
logist” fecy table is slightly altered from that given in the “Canadian Entomo- 
