DYTISCUS.—THERMONECTES. 43 
Hab. Norta America, Texas.—Mexico, Cordova (Sallé); Guaremaa, Torola 1000 feet, 
Duefias, San Geronimo, Guatemala city (Champion); Nicaracua, Chontales (7. Belt) ; 
Costa Rica, San Francisco 4500 feet (Rogers).—Sourn America, from Venezuela to 
Rio Janeiro. 
DYTISCUS. 
Dytiscus, Linnzeus, Syst. Nat. ed. xii. 2, p. 664 (1767); Aubé, Spec. Gén. vi. p. 102; Sharp, Trans. 
Roy. Dubl. Soc. n. s. ii. p. 904. 
This is a genus consisting of about two dozen species specially characteristic of the 
Palearctic and Nearctic regions ; but the single Mexican species (so far as yet known) 
is peculiar to Mexico. 
1. Dytiscus habilis. 
Dytiscus habilis, Say, Trans. Am. Phil. Soc. iv. 1834, p. 441; Sharp, Trans. Roy. Dubl. Soc. n. s. 
ii. p. 636. | 
Hab. Mexico, Parada (Boucard, coll. Sallé). 
HYDATICUS. 
Hydaticus, Leach, Zool. Misc. iii. p. 69 (1817); Sharp, Trans. Roy. Dubl. Soc. n. s. ii. p. 907. 
This genus comprises about fifty species, and is very widely distributed in both 
hemispheres. 
1. Hydaticus rimosus. 
Hydaticus rimosus, Aubé, Spec. Gén. vi. p. 182; Sharp, Trans. Roy. Dubl. Soc. n. s. ii. p. 654. 
Hab. Mexico, Orizaba, Vera Cruz, Puebla, Cordova (Sallé); Guatmmata, Dueiias, 
Guatemala city 5000 feet, Torola 1000 feet (Champion).—AntTILLES, Guadeloupe, Cuba. 
2. Hydaticus subfasciatus. 
Hydaticus subfasciatus, Lap. Et. Ent. p. 96; Aubé, Spec. Gén. vi. p. 186; Sharp, Trans. Roy. 
Dubl. Soc. n. s. ii. p. 6557+. 
Hab. GuatemaLa!; PanamMa.—SoutH America, Cayenne, Amazonia. 
THERMONECTES. 
Thermonectus, Esch. De}. Cat. ed. ii. (1833). 
Thermonectes, Crotch, Trans. Am. Ent. Soc. iv. p. 402 ; Sharp, Trans. Roy. Dubl. Soc. n. s. ii. p. 909. 
About fifteen species are known of this genus; they are peculiar to the warmer 
parts of America and the Antilles, two or three species extending their range to the 
United States of North America. 
GG 2 
