406 Mr. G. W. Kirkaldy on the 
rated ; scutellum nearly as long as metanotum. //emielytra : 
clavus and corium yellowish-brown, with a broad dark-brown band 
along the base of the latter, and sometimes with a narrower blackish- 
brown line along the scutellar and sutural margins of the clavus ; 
exterior margin of exocorium narrowly pale. Ada nervures 
yellowish-brown. Pedes: intermediate tibial spur small and rather 
blunt. Addoméinis dorsum shining black, genital segments blackish- 
fuscous margined with green. Venter black. 
Long. 12-12°5 mm., lat. pronot. 3°4-4 mm. 
Hab. Arrica: Guinea (ay coll.); Gaboon (Vienna 
Mus.), Cape of Good Hope (Paris Mus.). 
Types. Coll. mea. 
This species has no very close afhnities with any other 
Notonecta ; its long and slender form and rather stout 
hemielytra will at once separate it, while the structure of 
the head places it near N. insulata. 
Var. nov. stygica. 
Smaller and rather more slender ; hemielytra black, exterior 
margins of clavus broadly dark stramineous and interior half of 
apical margin of corium stramineous ; membrane sordid white, 
except the smoky basal part of the apex of the exterior lobe. 
Hab. ? Arrica (British Mus.). 
2. Notonecta shooterit, Uhl. 
Notonecta shooterit, Uhl., 1894, Pr. Calif. Ac. Sci. (2), 
Iv., p. 292. 
Head short, notocephalic lateral margins slightly diverging 
from the base and slightly converging towards the vertex, which is 
about one-third wider than the synthlipsis. Pvonotum large, rather 
longer in proportion to its width than in the other species, lateral 
and humeral margins sinuate. Scwtellum small, nearly one-third 
shorter than the metanotum ; black, base purple-brown. Sterna 
sordid rufotestaceous, hair-tufts black. Hem/clytra black; clavus 
(apex excepted) dull ivory-white, corium more or less concolorous, 
forming with the clavus a blotch of varying extent, and usually 
with a whitish spot along the apical margin, the claval and corial 
markings very similarly disposed to those of N. ti/guttata; apex of 
membrane smoky. The hemielytra vary, however, very much, 
being quite violet-black in some individuals (melena, var. nov.), 
while in others they are concolorous pale luteous. Membrane- 
