370 HEMIPTERA-HETEROPTERA. 
3. Notonecta shooteri. 
Notonecta shooteri, Uhler, Proc. Calif. Acad. Sci. (2) iv. p. 2921; Kirk. Trans. Ent. Soc. Lond. 
1897, p. 406”. 
Var. Notonecta melena, Kirk. loc. cit. p. 407°. 
Hab. Nortu America, Lower California }2.—Mexico?? (Sal/é); GuaTEMALA, near 
the city (Champion).—CoLomBIa 2. 
Three males before me from Guatemala and Mexico seem to belong to this species. 
They are more robust than either of the following forms, approaching WV. mezicana, 
from which they differ in the less convex and more widely separated eyes, the 
immaculate underside of the trochanters and femora, &c. 
4. Notonecta undulata. (Tab. XXII. fig. 10, 3.) 
Notonecta undulata, Say, Descr. N. Sp. Heteropt. Hemipt. N. Am. (New Harmony, Dec. 1831) ' ; 
Complete Writings, i. p. 368°; Uhler, Bull. U.S. Geol. Surv. (2) v. p. 289, t. 21. fig. 33 
(1875) °; in Kingsley’s Stand. Nat. Hist. ii. p. 252°; Proc. Calif. Acad. Sci. (2) iv. p. 292°; 
Kirk. Trans. Ent. Soc. Lond. 1897, p. 410°. | 
Notonecta americana, Herr.-Schaff. Wanz. Ins. ix. p. 44, t. 294. fig. 902”. 
? Notonecta unifasciata, Guér. Bull. Soc. Zool. Acclim. iv. p. 581 (1858) °. 
Hab. Nortu America 4, Canada °, United States ! 2 3 6, Lower California 5, Mexico ! 2 8, 
Temax in N. Yucatan (Gaumer), Tabi in Yucatan (Godman), Jalapa (Hoge); Guate- 
maLA, San Gerdnimo, Cubilguitz, Guatemala city (Champion).—Sovuta America to 
Patagonia®; ANTILLES, Cuba ®, Jamaica °%, &c. 
This appears to be the most widely distributed of the American Notonecte, and 
Prof. Uhler considers that NW. americana, Fabr., and NV. variabilis, Fieb., are probably 
conspecific with it. The insects here referred to V. undulata, most of which are from 
Yucatan, are smaller and narrower than any of the other Central-American forms 
known to me, and they have the anterior half of the pronotum so closely rugulose as 
to appear subopaque ; the eyes are flattened, and scarcely more distant behind than in 
N. mexicana; the fourth ventral segment is acutely keeled down the middle; the 
elytra have an oblique, pale stramineous, humeral patch, sometimes so extended as to 
leave the apex only of the corium black; the femora and trochanters are immaculate 
beneath. It is unnecessary to quote the full synonymy here. 
5. Notonecta americana, (Tab. XXII. fig. 11, ¢.) 
Notonecta americana, Fabr. Syst. Ent. p. 690 (1775) *; Kirk. Trans. Ent. Soc, Lond. 1897, p. 408 *. 
Hab. Mexico 2, Ciudad in Durango 8100 feet (forrer)—SovurH America, Chili 2, 
Valdivia 2; ANTILLES, Cuba ?. 
The three female specimens from N.W. Mexico here referred to N. americana, one 
of which has been cetermined by Mr. Kirkaldy, differ from the same sex of our 
