Revision of the Notonectidx., 415 
11. Notonecta whleri, Kirk. 
Notonecta uhleri, Kirk., 1897, Ann. Mag. N. H. (6), xx., 
p. 08. 
Head : notocephalon in the form of an inverted wine-decanter, 
margins greatly curved, widely diverging towards the vertex, which 
is six to eight times wider than the synthlipsis, at which point the 
eyes are almost contiguous ; breadth of the eye about ten times 
as great as that of the synthlipsis. Pronofum: humeral angles 
acute, accentuated, lateral margins sinuate, humeral margins little 
separate from the posterior margin. Metanotum dark purple-brown. 
Hemielytva varying from dark brick-red to rich orange-yellow ; 
a large, irregular black blotch at the base of the corium extending 
transversely and non-acuminately from the apex of the clavus to 
the golden-yellow exocorial lateral submargin ; membrane dark 
red-brown, apically black—this tint encroaching more or less 
basally. Alar nervures brown. Pedes: cox blackish ; inter- 
mediate tibial spur blunt, subcylindrical. Adbdominis dorsum : 
first and second segments rufotestaceous, deeper marginally, the 
remainder flavotestaceous, lurid marginally; this latter tint 
encroaching inwards more and more apically. <Addoménis venter 
rufotestaceous, densely provided with greenish-black ciliv. 
Long. ff. 11-114 mm., lat. 35-4 mm.; long. 2, 
12 mm., lat. 4 mm. 
Type ~. Uhler coll. 
Hab. N. America, Massachusetts (Uhler, Montandon, 
and Brit. Mus. colls.), New Orleans (Paris Mus.), Florida 
(Uhler coll.). 
Allied to N. variabilis (northern form) and probably 
representing the extreme limit of the N. americana series, 
viz.: N. americana, Fabr., N. wndulata, Say, and N. 
virescens, Blanch.,N. bifasciata, Guér., N.variabilis, Fieb., 
and N. whleri, Kirk. 
Hasily separated from all the other Notonecta by the 
structure of the head. 
12. Notonecta chinensis, Fallou. 
Notonecta chinensis, Fallou, 1887, Le Naturaliste, 
p. 418; Bergr., 1894, Rev. Ent., xiui., p. 164 
(redescription). 
N. sinica, Walk., 1873, Cat. Hem.-Het. Brit. Mus., 
vul., p. 204 (sec Stal), syn. nov. 
Head very narrow at the base, from which the notocephalic 
lateral margins keep almost parallel for a little space, then slightly 
