590 On Aquatic Carnivorous Coleoptera or Dytiscida. 
stout, and are scarcely bent at the knee, but are emarginate on the inner edge at 
some distance below it. The female is without sexual sculpture. The species 
seems to be variable in size, colour, and the depth of the strize on the elytra: some 
specimens from Cuba have the scratches on the hind coxe elongate, while in the 
individuals from the United States there are only short marks on that part. 
Copelatus punctulatus is referred as a synonym of this species on the authority of 
Crotch. 
United States, (Massachusetts, Texas) ; Cuba; Guadeloupe. 635. 
880. Copelatus adyena, n. sp.—Ovalis, subdepressus, niger, nitidus, capite, 
prothoracis lateribus angustius, antennis pedibusque rufis ; prothorace strigis bre- 
vibus sparsis, disco fere levigato ; elytris striis minus profundis decem ad apicem 
fere prolongatis, aliaque marginali anterius abbreviata ; corpore subtus piceo. Long. 
62, lat. 53 m.m. 
In this species the thorax bears distinct, but short and distant strize, which are 
not wanting in the middle near the base, but are nearly absent from a space anterior 
to this. In the male the front and middle tarsi are a little dilated, and the front 
tibize are curved and notched at the knee. The female is unknown. 
The habitat of this species is uncertain, but it is probably South America. 634. 
881. Copelatus integer, n. sp.—Ovalis, subdepressus, nitidus, piceus, capite 
dilutiore, prothorace ad latera, elytrorum basi, antennis pedibusque rufis; prothorace 
strigis minus numerosis haud subtilibus ornato; elytris striis decem sat profundis, 
ad apicem fere prolongatis, aliaque marginali anterius abbreviata. Lone. 52, lat. 
25 m.m. 
The sculpture of the thorax consists of rather deep but distant scratches some ot 
which are long and others short, they extend all across the thorax, the base in front 
of the scutellum being however more free from them than anywhere else. The 
male has the front and middle tarsi distinctly dilated, and its front tibiz are rather 
stout and simple, that is they are not curved or notched near the knee. 
Nicaragua, (Chontales, Belt). 633. 
882. Copclatus distinctus, Aubé, M.C.—em., Oblongo-ovalis, subdepressus, angus- 
tulus, piceus, prothoracis lateribus elytrorumque basi et lateribus ferrugineis, pedibus 
rufis; prothorace ad latera latius dense strigoso; elytris striis decem subtilibus, 
aliaque marginali anterius abbreviata; stria suturali anterius desinente. Long 5, 
lat. 22 m.m. 
The sculpture of the thorax in this species is very characteristic, the sides are 
densely covered with fine scratches, which extend so far inwards as to leave a 
