46 ADEPHAGA. 
- America, as well as in the United States; no variety I have from the former of these 
localities displays such a great departure from the average as do some of the North- 
American forms. Aubé’s record of the species from Brazil requires confirmation. 
ERETES. 
Eretes, Lap. Ann. Soc. Ent. Fr. i. p. 897 ; Crotch, Trans. Am. Ent. Soc. iv. p. 886. 
Eunectes, Er. Gen. Dyt. p. 23; Aubé, Spec. Gén. vi. p. 128. 
This genus comprises only two species. The one found in Mexico is one of the 
most cosmopolitan of insects, although it appears to be much rarer in the western than 
it is in the eastern hemisphere. 
1. Eretes sticticus. 
Dytiscus sticticus, Linn. Syst. Nat. ti. 666. 12; Sharp, Trans. Roy. Dubl. Soc. n. s. ii. p. 699. 
Eunectes griseus, Aubé, Spec. Gén. vi. p. 124. 
Hab. Fere in orbe toto. Mexico, San Luis Potosi (Dr. Palmer); Tres Marias Is. 
(Forrer). 
This, the most widely distributed of the species of Dytiscide, appears to be compa- 
ratively rare in the New World. I am acquainted with only a few individuals from 
Mexico ; and in South America it is recorded only from Peru. 
MEGADYTES. 
Megadytes, Sharp, Trans. Roy. Dubl. Soc. n. s. ii. p. 917. 
Cybister (ex parte), Aubé, Spec. Gén. vi. p. 43. 
This is a genus of about twenty species peculiar to the New World, in the southern 
parts of which it replaces Cybister of the Old World and North America. 
1. Megadytes levigatus. 
Dytiscus levigatus, Oliv. Ent. in. 40, p. 14, pl. 3. £23; Sharp, Trans. Roy. Dubl. Soc. n.s. ii. p. 707. 
Cybister levigatus, Aubé, Spec. Gén. vi. p. 99. 
Hab. Mexico, Vera Cruz; Guatemata, Torola 1000 feet, Paso Antonio 400 feet 
(Champion); Nicaracua, Chontales (Belt); Panama.—Braziu. 
At the time I remarked on this species (loc. swpr. cit.) I had seen only two or three 
Mexican individuals, among which were no males, and I remarked that the females in 
Mexico were usually nearly or quite destitute of sexual sculpture. In the series at 
present before me there is only a single Mexican female; and this has a small sexual 
sculpture, as have also two females from Chontales, while the unique individual of this 
sex from Guatemala is almost (but not quite) absolutely destitute of such sculpture. 
The males depart from the Brazilian individuals, inasmuch as they possess a superior 
development of the front tarsi, which are formed much as in Megadytes flohri. From 
