Revision of the Notonectide. 417 
men must be regarded as the type, Dr. Bergroth’s example 
and the other individuals in Fallou’s collection (Paris Mus. 
and my coll.) being entitled to rank as syntypes. 
13. Notonecta triguttata, Motsch. 
Notonecta triguttata, Motsch., 1861, Etudes ent:; X:, 
p. 24. 
Head wider at base than in N. chinensis and not so markedly 
divergent ; notocephalic lateral margins sensibly curved and the 
vertex a trifle more than two and a-half times as wide as the 
synthlipsis, which is about a-third of the width of the eye. Pronotum: 
lateral and humeral margins sinuate, the former suddenly broaden- 
ing towards the humeral angles (which are acute), the pronotum 
thus having somewhat the appearance of being subconstricted 
mediolaterally. Hemielytra variable in pattern, black or bluish- 
black, with three fascie or blotches, varying in size and extent, the 
anterior generally flavous, the postreme rufous or castaneous: the 
flavous bands sometimes widely separate and slender, causing 
melanechroic specimens, at other times uniting so that nearly the 
whole of the clavus and the anterior half of the corium form a 
single extensive blotch ; the postreme spot situated along the apical 
margin of the corium. Lateral margins of exocorium and membrane 
narrowly flavescent. Alar nervures yellow-brown. Pedes: cox 
black. Abdominis dorsum black, occasionally slightly reddish- 
brown laterally. Abdominis venter black. 
Long. 18-14 mm., lat. 5 mm. 
Type. ? Moscow. 
Hab. Japan, Yokohama (Budapest, Nowalhier and my 
colls.), Seso (Paris Mus.). 
Very common in Southern Japan. 
Very similar at first sight to some forms of N. glauca, 
L., but readily distin ouished by the cephalic structure. 
14. Notonecta montandoni, Kirk. 
Notonecta montandoni, Kirk., 1897, Ann. Mag. N. H.(6), 
ReXey le OO: 
Head: very similar to that of N. triguttata, but altogether 
larger, wider both at the vertex and synthlipsis ; notocephalic 
lateral margins much straighter; vertex about twice as wide as 
synthlipsis, which is about a-third of the breadth of an eye. 
