HUNGERFORD: AQUATIC HEMIPTERA. 169 
Notonecta undulata Say 1832. 
Say, Disc. n. sp. Het. Hem. N. A. Fitch reprint, p. 812. Le Conte Ed. Comple. Writ. 
1859, p. 368, vol. 1. 
“Head diverging curvedly (varying in degree) from the synthlipsis, 
which is not quite two and a half times less wide than the vertex. 
Pronotum very similar to that of N. glauca Linne, but the humeral 
margins as a rule not distinct. Scutellum not quite one-fourth shorter 
than the metanotum, varying in color from pale luteous to black, with 
_ divers intermediate arrangements of the two colors; similar hemelytrical 
‘markings occurring with dissimilarly colored scutella and vice versa. 
Metanotum varying from luteous to black, with three or more dark 
castaneous stripes; scutellar margin luteous. Hemelytra exceedingly 
variable, giving rise to a number of well-marked varieties, though these 
are linked together by intermediate forms.—Bueno and Kirkaldy. 
_ Distribution: General over United States—Kansas; Colorado; Mis- 
souri; Nebraska; Massachusetts; Rhode Island; New York; New Jersey; 
Maryland; Washington, D. C.; Quebec, Canada; Illinois; Texas; Arizona; 
Idaho; Virginia; Iowa; Ohio; Tennessee; Indiana; Kentucky; Utah; 
Ontario; Maine; North Carolina; Florida; Louisiana; Minnesota; Mon- 
tana; New Mexico; California; Oregon; British Columbia; Vancouver 
Island; Manitoba; New Hampshire; Vermont and Connecticut. 
Notonecta variabilis Fieber 1851. 
Abh. Bohm. Ges. Wiss. (5), VII, p. 477 (in part). 
“Head, notocephalic lateral margins diverging curvedly from the nar- 
" row base, vertex about three times as wide as synthlipsis. Pronotum, 
- width of posterior margin not quite twice as great as the length of the 
_ pronotum. Hemelytra, clear white inclining to yellowish, with a golden 
_ pubescence. Alar nervures pale golden yellow. Pedes and abdomen as 
in N. undulata Say. 
. “Long., 8.2 to 10.2 mm.; lat., 3.2 to 3.7 mm.”—Bueno and Kirkaldy. 
| Distribution: Kansas, Nebraska, Ohio, Michigan, Wisconsin, Rhode 
Island, Indiana, Maryland, Pennsylvania, Massachusetts, Illinois, New 
_ York, Quebec, Ontario, Maine, New Jersey, District of Columbia, North 
Carolina, Florida, Ohio, New Hampshire, Vermont and Connecticut. 
Notonecta raleighi Bueno 1907. 
Bueno, Can. Ent., vol. 39, p. 225. 
ay “Head: Notocephalic lateral margins nearly straight; vertex more 
_ than six times as wide as synthlipsis; base of eyes over four times as 
_ wide as synthlipsis. 
. “Pronotum two-thirds broader than long; base and lateral margins 
_ nearly straight, humeral margin sinuate. Scutellum one-quarter broader 
_ than long, sides pronouncedly sinuate, caudal angle long. Hemelytra little 
_ longer than the body, moderately clothed with a silvery pubescence on 
_ the clavus and corium; membrane lobes unequal. Abdomen luteous, 
_ fringing cilie black, sparse. Pedes luteous; intermediate femoral spur 
concolorous, long, thin and sharp. 
— “Coloration: Eyes dark reddish-brown. Cranium and _ prothorax 
whitish. Scutellum ranges from pure light yellowish to black, disk 
y margined with smoky orange-yellow on the hemelytral margins. “ Hemely- 
- tra ranging from white with vague beginnings of. the corial fascize and 
_ black humeri with white membrane, through all intergrades to a form 
_ with a blackish stripe along the anterior margin of the corium; black 
_ margins to the clavus along the scutellar edges; a blackish streak along 
_ the corium near to and parallel to the claval suture; black corial fascize 
