Revision of the Notonectide. 425 
18. Notonecta lutea, Mill. 
Notonecta lutea, O. F. Miill., 1776, Zool. Dan., p. 103 ; 
Fieb., 1851, Abh. bohm. Ges. Wiss. (5), vii., 
p- 473; Flor, 1860, Rhynch. Livl., i1., p. 774; 
Fieb., 1861, Europ. Hem., p. 100; J. Sahlb., 
1875, Not. Sallsk. Faun. Fenn. Forh. xiv., 
p- 274; Duda, 1891, Klub. prirod. Praze, p. 13, 
pleiv., tig. 1. 
N. wnicolor, Herr.-Schaff., 1835, Nomencl. Hnt., p. 65; 
1848, Wanz. Ins., viii., p. 23. 
N. tumida, Germ. MS. 
Head large, notocephalic lateral margins slightly diverging 
from base, vertex two to two and a-quarter times as wide as 
synthlipsis. Entirely luteous (except the dark claret eyes, 
occasional dark-brown markings along the sutures of the clavus, 
&c., the bronze-brown sternal hair-tufts, the black unguiculi 
and venter). Scutellum a third wider than long. Exterior lobe 
of membrane only about half the size of the interior lobe, and 
ebviously not so long. Alur nervures luteous, Pedes : spine on 
intermediate tibia, large, acute, black-tipped. 
Long. 13-17:1 mm., lat. pron. 4°5-5°5 mm. 
Tyre lost. The description has been drawn up from 
specimens kindly sent by Dr. J. Sahlberg. 
Hab. Evrors, Tammati in Finiand (my coll.), Bohemia 
(my coll.) ; Asia, Siberia (Brit. Mus.). 
Very similar in structure to N. glauca; it has, how- 
ever, a more arched appearance, is stouter and more 
robust, especially postero-laterally, the apical margin of 
the pronotum is straighter and the scutellum is shorter. 
The intermediate tibial spur is also much longer. ‘The 
head is larger and flatter, the notocephalon is rather 
wider basally and vertically, and the lateral margins 
straighter. Duda’s figure represents a Bohemian speci- 
men; these are generally less robust posteriorly than the 
northern forms. He has made the usual mistake of pro- 
viding the posterior tarsi with long unguiculi. 
Var. scutellaris, J. Sahlb. 
Dr. Sahlberg has exhibited to the Societas Fennica 
some interesting varieties of this species, one of which’ he 
