414 Mr. G. W. Kirkaldy on the 
(type) Maldonado ” ; the second and newer, “ Notonecta 
polystolisma, Fieb., p. 53, Maldonado bifasciata, Guér., 
Ic. R. A. (type).” 
10. Notonecta variabilis, Fieb. 
Notonecta variabilis, Fieb. (in part.), 1851, Abh. bohm. 
Ges. Wiss. (5), vil., p. 477; Berg (in part.), 1879, 
Ann. S. Cient. Argent., vill., p. 74 (reprint, 
Delo7). 
Head: as in N. bifasciata. Pronotum: width of posterior 
margin not quite twice as great as the length of the pronotum. 
Hemielytra very variable. Alar nervures pale golden yellow. 
Pedes and abdomen as in N, undulata, Say. 
» 
Long. 86-10 mm., lat. 3°2-3°7 mm. 
ver. f. 
Hab. America. Apparently distributed over the 
greater part of the United States, Brazil, and the Argen- 
tine and Uruguaian Republics. 
There are two well-marked forms, which may be dis- 
tinct species. ‘The first, which occurs more commonly in 
N. America (and is considered by Prof. Uhler to be a 
variety of NV. undulata), is long and slender, approaching 
N. whleri in shape both of head and hemielytra; the 
latter are usually whitish or yellowish immaculate. The 
second, which is found occasionally in N. America, but 
commonly in Uruguay and Argentine, is exceedingly 
like N. undulata, Say, both in appearance and hemi- 
elytral markings. It differs, however, in the shape 
of the head and generally in the much smaller size. It 
is the N. variabilis, Berg (according to specimens 
kindly lent to me by Mr. Distant). As regards the 
individual labelled “Type” in M. Noualhier’s collec- 
tion, I am unable to recognize it as the true type, 
although it may well act as one, inasmuch as it is appar- 
ently the only authentic specimen of Fieber’s in existence. 
It is undoubtedly from Fieber’s collection, having passed 
from Lethierry’s possession to that of M. Noualhier. 
Nevertheless, Fieber (l. c., p. 477) distinctly mentions 
the Vienna, Berlin, and Halle Museums as the col- 
lections wherein were his original specimens. 
