COPELATUS. 39 
yellowish red, but infuscate over a broad space on the middle; towards each side there 
are numerous short but deep impressions or scratches, most of which have an oblique 
direction; the curved lateral series of punctures is very much obliterated. lytra very 
regularly striated by ten moderately fine lines; the sutural stria is longer than the 
others, and reaches nearly to the apex; the third, fifth, seventh, and ninth are also 
elongate, but slightly shorter than the sutural; the second, fourth, sixth, eighth, and 
tenth are also elongate, but they are distinctly shorter than the others; the submar- 
ginal stria is short and fine. The species is described from a single male; it has the 
front and middle tarsi much dilated, and furnished beneath with rather larger palettes ; 
the anterior tibie are rather short and stout, and are without notch. The species is 
not closely allied to any other; but I think it is just possible that C. basalis may prove 
to be its female. 
13. Copelatus prolongatus. 
Copelatus prolongatus, Sharp, Trans. Roy. Dubl. Soc. n.s. i. p. 586. 
Hab. PaNaMa. 
14. Copelatus posticatus. 
Dytiscus posticatus, Fab. Syst. El. i. p. 268; Sharp, Trans. Roy. Dubl. Soc. n.s. ii. 587. 
Copelatus posticatus, Aubé, Spec. Gén. vi. p. 372. 
Var. Copelatus signatus, Sharp, Ent. Mo. Mag. x. p. 53. 
Hab. Mexico, Cerro de Plumas (/Hége), Cordova (Sallé); GuaTeMa.a, Torola, 1000 feet, 
Paso Antonio, 400 feet (Champion); Nicaragua, Chontales (7. belt); Panama.—Soutu 
America, from Cayenne to Rio de Janeiro; ANTILLES, Cuba, Guadeloupe. 
_ This widely distributed species shows a good deal of variation, the most remarkable 
variety being that found in Nicaragua, and described by me (Joc. supr. cit.) as a distinct 
species, under the name of C. signatus. 
15. Copelatus terminalis. (Tab. I. fig. 9.) 
Copelatus terminalis, Sharp, Trans. Roy, Dubl. Soc. n. s. 11. p. 588. 
Hab. Mexico, Cerro de Plumas, Jalapa(Hége); GuaTeMALA, San Geronimo, El Jicaro 
(Champion). 
A large series of this species seems to indicate that it is distinct from C. posticatus 
the specimens show but little variation, except that those from Mexico are not quite so 
large as those from Guatemala. 
16. Copelatus depressus. 
Copelatus depressus, Sharp, Trans. Roy. Dubl. Soc. n.s. ii. p. 588. 
Hab. Guatemata, San Geronimo (Champion). 
