On Aquatic Carnivorous Coleoptera or Dytiscide. 343 
fine punctures, which are distinct on the sutural portion, and more obsolete towards 
the sides. Under surface impunctate and very shining. 
Also in this’ species the prosternal process takes two forms, in the one it is 
rhomboidal with the margins raised, and in the other a deeply bifid process. 
Brazil, (Bahia). (Mexico, fide Clark). 60. 
239. Hyphydrus mendozanus, Steinheil, Atti. Soc. Ital. Sci. Nat. XI, p. 249.— 
Brevis, latus, sat convexus, ferrugineus, vix nitidus, dense sat fortiter punctatus, 
prothoracis angulis posterioribus acutis. Long. 23, lat. 13 m.m. 
Closely allied to Desmopachria suturalis (No. 229), and D. ovalis, but distin- 
guished by the much denser punctuation ; there are only very indistinct indications 
of a sutural stria, the sinuation of the base of the thorax on each side is close to 
the hind angles, and is not very distinct, because the side of the thorax is a little 
depressed. The hind coxe are coarsely and deeply punctured. 
I am indebted to Herr Steinheil for the only specimen I have seen of this species. 
South America, (San Carlos). 78. 
240. Hydroporus latissimus, Lec., M.C.—Latissimus, brevis, nitidus, sine pubes- 
centia, crebre sat fortiter punctatus, ferrugineus, prothorace basi infuscato, elytris 
testaceis, sutura late irregulariter maculaque externa nigricantibus; clypeo 
acute marginato, prothorace utrinque plica curvata; elytris stria suturali sat 
distincta, lateribus foveolatis; coxis posterioribus fortiter punctatis. Long. 2, 
lat. 13 m.m. 
The fovea of the elytra is placed quite at their edge so that it may easily 
escape notice. 
California. 170. 
241. Hydroporus dispersus, Crotch, Tr. Am. Ent. Soc. IV, p 358.—Latissimus, 
brevis, nitidus sine pubescentia, crebrius sat fortiter punctatus, ferrugineus, 
prothorace basi infuscato, elytris testaceis, sutura signaturaque externa HIQTIS ; 
prothorace utrinque plica curvata ; elytris stria suturali distincta ; coxis posteriori- 
bus sparsim sat fortiter punctatis. Long. 2, lat. 15 m.m. 
Very similar in form to Hydroporus latissimus, (No. 240), but readily dis- 
tinguished by the more finely and densely punctured thorax, the absence of fovea 
on the elytra, and the less extent of the dark markings, and the less distinctly 
punctured coxe. It also a good deal resembles D. varians, (No. 232), but is 
shorter and broader, and has the punctuation of the coxze less developed than that 
species. 
California. 171. 
