On Aquatic Carnivorous Coleoptera or Dytisciche. 597 



900. Aglymbus optatus, n. sp. — Ovalis, sat nitidus, pioeus, supra nigricante, 

 cajiite elytrisque apice dilutioribus, prothoracis lateribus antenuis pedibusque 

 ferrugineis ; thorace llneolis brevibus fere subtilibus, minus numerosis ; el3''tris 

 lineolis brevibus baud densis, versus a]iicen) obliquis. Long. 6, lat. 3.^ m.ni. 



llatber broader than Agabus leprieuri (No. 89S), and with the sculpture of the 

 upper surface less dense ; in other respects excessively similar. The only individual 

 I have seen is I think a female. 



South America, (Columbia). 71 .5. 



901. Agabus paUidiventris, Aube, M.C. — 6 Oblongo-ovalis, minus elongatus, 

 depressiusculus, nitidus, subtus rufescens, supra nigro-piceus, capite prothoracis 

 lateribus antennis pedibusque rutis, elytris ad basin et apicem testaceo-maculatis ; 

 thorace elytrisque lineolis subtilissimis brevibus impressis; antennis fere clongatis. 

 Long. 4:1, lat. 2g m.m. 



The only individval I have seen is from Dcjean'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. — Feni., 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. Ci, lat. 3^ m.m. 



The antenna3 ai"e elongate. The head i=i very finely punctured ; the thorax is 

 even more indistinctly punctured, and has a fine channel on the disc. The striae 

 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 of a stria which is absent. 



I have seen but a single individual of this very distinct species. 



Abyssinia, (Seiotel, Bogos ; Beccari, 1870; Genoa M us.) 714. 



903. Agl^^mbus brevicornis, n. sp. — Fcni., (Jblongo-ovalis, baud elongatus, 

 depressiusculus, nitidus, impunctatus, piceus, capite anterius prothoracisque 

 lateribus rufescentibus, antennis pedibusque testaceis ; prothoracc ad latera lineolis 

 subtilissimis; elytris striis quatuor abbreviatis a punctis sat conspicuis baud 

 interruptis ; antennis brevibus crassiusculis. Long. 4, lat. 2i m.m. 



4 II 2 



