868 HEMIPTERA-HETEROPTERA. 
Patten), San José (Pittier®; Biolley, in coll. Distant); Panama, David, Volcan de 
Chiriqui (Champion).—Souta America!3, Colombia?, Venezuela?’, Guiana? 5, 
Brazil?2®; ANTILLES, Cuba 2, 
Widely distributed in the warmer parts of Central America, but apparently absent 
from the central plateau of Mexico, where it is replaced by B. angustipes. Very like 
B. angustipes, but with the hind tibie much broader and with a blunt flattened tooth 
at the inner apical angle beneath (fig. 3a). 
8. Belostoma angustipes. (Tab. XXII. figg. 5, 5a, 3.) | 
Belostama angustipes, Mayr, Verh. zool.-bot. Ges. Wien, xxi. pp. 423, 427°; Mont. Ann. Soc. Ent. 
Belg. 1896, p. 511”. 
Had. Mexico (Bilumek, in Mus. Vind. Ces.1; Mus. Holm. ; Dugés*), Mexico city 
(Hoge, H. H. Smith). 
Mr. H. H. Smith has sent us numerous specimens of this species from the vicinity 
of the city of Mexico. Bilimek’s examples were probably from Tacubaya, not far 
distant. 
Fam. NOTONECTIDZ. 
NOTONECTA. 
Notonecta, Linnzus, Syst. Nat. ed. 10, p. 489 (1758); Fieber, Rhynch. p. 48 (1851) ; Gen. Hydroc. 
p. 25, t. 8p (1851); Kirkaldy, Trans. Ent. Soc. Lond. 1897, p. 397. 
Several species of this well-known genus inhabit Central America, but one only, 
N. mexicana, is well represented in our collection, few travellers, myself included, 
having paid much attention to them. They divide up into two groups: one, including 
N. mexicana and N. montezuma, with the carina on the fourth or fourth and fifth 
ventral segments thickened and smooth, and the femora and trochanters vittate with 
black or piceous beneath ; the other, including NV. shooter’, N. undulata, and NW. ameri- 
cana, with the ventral carina acute and hidden by the swimming-hairs, and the femora 
and trochanters immaculate beneath. 
1. Notonecta mexicana. (Tab. XXII. figg. 6, 6 a-d, 3; 7, 2.) 
Notonecta mexicana, Amy. et Serv. Hist. Nat. Ins. Hémipt. p. 453, t. 8. fig. 7 (1843) °; Herr.- 
Schaff. Wanz. Ins. ix. p. 48, t. 294. fig. 903°; Walk. Cat. Heteropt. Hemipt. viii. p. 203°; 
Uhler, in Kingsley’s Stand. Nat. Hist. ii. p. 252°; Check-list Hem.-Het. N. Am. p. 28°; Proc. 
Calif. Acad. Sci. (2) iv. p. 292°; Kirk. Trans. Ent. Soc. Lond. 1897, p. 401”. 
Notonecta klugii, Fieb. Rhynch. p. 50 (1851) °. 
? Notonecta impressa, Fieb. loc. cit. p. 51°. 
Hab. Norru America®, Western United States’, Arizona4, Lower California °.— 
