Revision of the Notonectide. 423 
Dr. Puton has had the kinduess to send me specimens 
from Nicily, entirely according with the type above 
mentioned. 
The forms with luteous seutellum have been labelled 
in several collections ‘‘ lutea,” but they differ by being 
darker and less robust and by the structural characters 
diagnostic of the two species (vide Analytical Table). 
They are (with the exception of the unguiculi, &c.) dark 
luteous as a rule, but in a few individuals, the hemielytra 
are incipiently brunneomaculate. 
Long. 15:4: (12°2 exceptional)—17:2 mm., lat. 4-5-6 mm. 
glauca, 13°4-16 mm., and 4°5-5°5 mini marmorea, 
14°7-16 mm., and 5-5°5 mm. ; marginata, 14-17-2 mm., 
and 5°2-6 mm.; canariensis, 14°5 mm.,; and maculata, 
12:2 (exceptional)-15 mm., and 5-5°5 mm.; maculata 
(leucochroic) 13°5-13-:7 mm., and 4°6 mm. 
Tyeus: glauca, ? Upsala; marmorea, Mus. Sehestedt 
(sec. Stul); Nepa notenecta, Stockholm Mus. (see. 
Reuter) ; maculata, Bose coll. (Paris Mus.) [? “type” ; 
rather ‘‘syntype”’?]; canariensis, Vienna Mus.; mar- 
ginata?. 
Hab. Hurorz; Asta, 8. W. region, Siberia, N. India; 
Arrica, paleearctic portion; Canary IsLes. 
N. glauca and marmorea; practically the whole of 
Kurope, Amurland (Brit. Mus.), Transcaspia, Persia, 
Yarkand (Distant), and the whole of paleearctic Africa. 
N. marginata: practically the whole of Hurope (but 
rather local and apparently not a constant variety), 
KXashmir. 
N. canariensis: Teneriffe, Barenco Nidalgo (O. Simony, 
1888, Vienna Mus.). 
N. naculata: the whole of Europe (but local) and 
palzearctic Africa; the leucochroic form seems confined to 
Africa. 
In Pr. Ent. Soc. Lond., 1897, p. xxxv., I noted the 
presence of this species in North America. I was then 
under the impression that Prof. Uhler was responsible 
for the record of its occurrence in Michigan and Kansas 
(Townsend, 1891, Pr. Hnt. Soc. Wash., u., p. 56), but 
this appears to be a mistake, and it is probable that the 
specimens belong to N. insulata, while Shepherd’s 
record (1848, Amn. Mag. N. H. (2), 1., p. 158. Source of 
the Mississippi under 48°) applies to N. insulata or N. 
