88 HYDROPHILIDA. 
5. Chetarthria pusilla. 
Breviter ovalis, convexa, nigra, prothoracis limbo laterali pallido; antennis, palpis pedibusque rufis; elytris 
versus apicem picescentibus, subtilissime punctulatis, stria suturali elongata, sed in tertia parte basali 
desinente. 
Long. 3 lin. 
Hab. Guaremata, Rio Naranjo 450 feet, Guatemala city (Champion). 
This very minute insect is probably closely allied to the Californian C. nigrella, Lec. ; 
but, although I have not the opportunity of comparing the two, I think it is most likely 
they are distinct. 
EPIMETOPUS. 
Epimetopus, Lacordaire, Gen. Col. 1. p. 467 (1854). 
Ceratoderus, Muls. (nom. proce.) Mém. Ac. Sci. Lyons, i. p. 1 (1851). | 
Sepidulum, Lec. Trans. Am. Ent. Soc. v. p. 47 (1874) ; Sharp, Ent. Monthl. Mag. xi. p. 247. 
This is one of the most interesting of the genera of Hydrophilide, and consists of 
_ four species—one East Indian, a second Colombian, and a third that may be either 
South or Central-American, its precise habitat being unknown. 
The species are probably riparial rather than aquatic in their habits. 
1. Epimetopus costatus. (Tab. III. fig. 3.) 
Sepidulum costatum, Lec. Trans. Am. Ent. Soc. v. p. 47’. 
Hab. Nortu America, Texas '.—GuatemaLa, San Gerénimo, Rio Naranjo 450 feet 
(Champion). 
HELOPHORUS. 
Elophorus, Fabricius, Gen. Ins., Mant. i. p. 42. 
This is a genus of about sixty species. It has a very wide extension in the northern 
portions of the eastern hemisphere; and ten or a dozen species have been described 
from North America. The species, even in distant parts of the world, are so very similar 
to one another that they can scarcely be distinguished by description or even by 
comparison. 
1. Helophorus aquaticus. 
Elophorus aquaticus, Oliv. Enc. Meth. vi. p. 3811. 
Helophorus aquaticus, Muls. Col. Fr., Palp. p. 33’. 
Elophorus grandis, Ill. Kat. Preuss. p. 272°, 
Hab. Mexico (coll. Sallé).—KurRope and the Mediterranean region ! 23, 
This species is represented by a single example from Sallé’s collection ; this specimen 
is very badly preserved, and has no special locality attached. Although it may possibly 
have found its place wrongly in M. Sallé’s collection, yet I think it more probable that 
