On Aquatic Carnivorous Coleoptera or Dytiscide. 597 
900. Aglymbus optatus, n. sp.—Ovalis, sat nitidus, piceus, supra nigricante, 
capite elytrisque apice dilutioribus, prothoracis lateribus antennis pedibusque 
ferrugineis ; thorace lineolis brevibus fere subtilibus, minus numerosis ; elytris 
lineolis brevibus haud densis, versus apicem obliquis. Long. 6, lat. 3} m.m. 
Rather broader than Agabus leprieuri (No. 898), and with the sculpture of the 
upper surface less dense ; in other respects excessively similar. The only individual 
IT have seen is I think a female. 
South America, (Columbia). 713. 
901. Agabus pallidiventris, Aubé, M.C.—g Oblongo-ovalis, minus elongatus, 
depressiusculus, nitidus, subtus rufescens, supra nigro-piceus, capite prothoracis 
lateribus antennis pedibusque rufis, elytris ad basin et apicem testaceo-maculatis ; 
thorace elytrisque lineolis subtilissimis brevibus impressis ; antennis fere clongatis. 
Long. 44, lat. 25 m.m. 
The only individval I have seen is from Déjean’s collection and is in bad preser- 
vation ; it is a male and has the basal joints of the front and middle tarsi distinctly 
thickened. In this species the hind border of the posterior femora is straight and 
its apical angle nearly rectangular. 
South America, (Cayenne). 715. 
902. Aglymbus gestroi, n. sp.—Fem., Elongatus, subparallelus, depressus, sub- 
opacus, fere impunctatus, subtus rufescens, abdomine versus apicem infuscato, supra 
nigricante, capite prothoracisque lateribus rufescentibus, elytris ad apicem dilutiori- 
bus, basi testaceo, antennis pedibusque rufis; elytris striis obsoletis quatuor sub- 
disintegratis. Long. 63, lat. 3} m.m. 
The antennz are elongate. ‘The head is very finely punctured ; the thorax is 
even more indistinctly punctured, and has a fine channel on the disc. ‘The strize 
of the elytra are fine and indistinct, the first is remote from the suture, the second 
does not reach to the base, between the third and fourth there are some remote 
punctures in place ofa stria which is absent. 
I have seen but a single individual of this very distinct species. 
Abyssinia, (Seiotel, Bogos ; Beccari, 1870; Genoa Mus.) 714. 
903. Aglymbus brevicornis, n. sp.—Fem., Oblongo-ovalis, haud elongatus, 
depressiusculus, nitidus, impunctatus, piceus, capite anterius prothoracisque 
lateribus rufescentibus, antennis pedibusque testaceis ; prothorace ad latera lineolis 
subtilissimis; elytris striis quatuor abbreviatis a punctis sat conspicuis haud 
° ° . - ° . 71 
interruptis ; antennis brevibus crassiusculis. Long. 4, lat. 21 m.m. 
4H 2 
