On Aquatic Carnivorous Coleoptera or Dytiscide. 573 
the disposition of the strize on the elytra is much the same as in the C. punctulatus 
(No. 831), the outer one being however rather shorter, but the present species is 
much larger. ; 
Tle de France, (coll. Bonvouloir). TI have some doubts whether this locality be correct. 654. 
836. Copelatus coxalis, n. sp.—Oblongus, elongatus, angustulus, subparallelus, 
piceus, prothoracis lateribus dilutioribus, elytrorum basi, antennis pedibusque rufis ; 
prothorace fere leevigato ; elytris striis quinque sat profundis, prima (a sutura haud 
remota) quintaque posterius brevioribus, hoc basin haud attingente; coxis poster- 
loribus profundius aciculatis ; antennis elongatis. Long. 6, lat. 2? m.m. 
This species is very distinct on account of the coarse sculpture of the coxe and 
the fine strie on each elytron. I have seen but a single female. 
South America, (Amazonia). 649. 
Group 3. (No. 837). 
Elytra without submarginal stria, but with six other striz on each. 
A single species of short form is the only one known to me ; except for the absence 
of the submarginal stria it completely resembles the species of Group 10. 
837. Copelatus duodecenistriatus, Aube, M.C.—Oblongo-ovalis, angustulus, sat 
depressus, piceus, capite et prothoracis elytrorumque lateribus dilutioribus, antennis 
pedibusque rufis; prothorace vix punctulato ; elytris striis sex profundis, suturali 
anterius desinente, et 3°, 5° que ad basin paulo abbreviatis. Long. 5, lat. 23 m.m. 
This species is known to me only from the fragments of two specimens from 
Dejean’s collection. It bears much resemblance tv Copelatus pusillus (No. 854), 
but the strize of the elytra are deeper, and the marginal one is absent. I have 
great doubts whether the specimen in Chevrolat’s collection from Guadeloupe 
(referred to by Aubé, Spec. p. 378), is the same species, though it is certainly very 
similar. 
Tle de France. 
Group 4. (Nos. 838 and 839). 
Elytra without submarginal stria, but with eight other strive on each wing-case. 
The strize deficient are the internal ones, and of the eight present some are very 
much abbreviated. 
