HUNGERFORD: AQUATIC HEMIPTERA. 169 



Notonecta undulata Say 1832. 



Say, Disc. n. sp. Het. Hem. N. A. Fitch reprint, p. 813. 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. inidulata Say. 



"Long., 8.2 to 10.2 mm.; lat., 3.2 to 3.7 mm." — Bueno and Kirkaldtj. 



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. 



"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 ciliae 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 

 margined with smoky orange-yellow on the hemelytral margins. Hemely- 

 tra ranging from white with vague beginnings of the corial fasciae 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 fasciae 



