342 On Aquatic Carmvorous Coleoptera or Dytiscide. 
935. Hydroporus granum, Lec., Proc. Ac. Phil. 1855, p. 294. —Breve, latum, sub- 
rotundatum, sat convexum, nitidum,rufo-testaceum; elytris versus suturam subtiliter 
punctulatis, lateribus apiceque cum prothorace et corpore subtus fere omnino 
Jeevigatis. Long. ig, lat. 1$ m.m. 
This species is very closely allied to Desmopachria nitida, Bab., but is a little 
smaller, and the punctuation of the upper surface is rather less close and distinct. 
I am not quite sure that the Brazilian specimens will prove to be conspecific with 
the North American ones, but the resemblance is excessive,and I have failed to detect 
any satisfactory distinctive character. 
North America, Brazil, (Santa Rita, Aug., 1850, Sahlberg). 453. 
236. Desmopachria nitida, Bab., Tr. Ent. Soc. Lond. III, 1841, p. i7.—Brevis, 
lata, subrotundata, sat convexa, nitida, rufo-testacea; elytris sat crebre, distincte 
sed subobsolete punctatis. Long. 1s, lat. 1 m.m. 
The clypeus is broadly rounded in tront with the margin fine, the surface of the 
head is impunctate. The thorax is only indistinctly punctured. The under surface 
is very nearly impunctate, the coxee exhibiting only a few obsolete fine punctures. 
The species is very closely allied to Hydroporus granum (No. 235), but is a little 
larger, and is a little less indistinctly punctured ; on the other hand it is decidedly 
smaller than Hydroporus convexus, and its punctuation is less distinct; it thus 
appears to be about intermediate between these two closely allied species. 
Brazil, (Rio de Janeiro). 55. 
237. Hydroporus convexus, Aube, M.C.—Brevis, latus, fere rotundatus, sat 
convexus, ferrugineus, sat crebre subtiliter punctatus ; prothorace basi utrinque vix 
sinuato. Long. 1%, lat. 1§ m.m. 
The clypeus in front is broad and gently rounded, extremely finely margined ; 
the punctuation of the hind coxz is sparing and fine, but quite distinct. 
I have seen only one specimen from Brazil, and am by no means sure it will prove 
to be conspecific with the North American individuals, although I cannot at present 
point to any satisfactory distinctive character. 
United States of North America ; and Brazil, (Santa Rita, Sahlberg). 58. 
238. Hydroporusbryanstoni, Clk., M.C.—Brevis, latus, subrotundatus, sat convexus, 
pallide castaneus, nitidus, elytris sutura infuscata ; prothorace fere levi, basi utrinque 
sinuato, angulis posterioribus acutis; elytris crebre obsolete punctatis, Long. 23, 
lat. 1§ m.m. 
Head with rather sparing and fine, but quite distinct, punctures. Thorax with 
only some indistinct punctures at the base in the middle. Elytra with numerous 
