S^Jli2 ^On Aquatic Carnivorous Coleoptcra or DytiscidcB. 



235. Hydroi'orus gran um, Lee, Proc. Ac. Phil. 1855, p. 294. — Breve, latum, sub- 

 rotundatuin, sat convexum, Ditidum,rufo-testaceum; elytris versus suturam subtiliter 

 punctulatis, lateribus apiceque cum prothorace et corpore subtus fere omnino 

 Isvigatis. Long, is, lat. 1 J 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 um 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). 153. 



236. Desmopachria nitida, Bab., Tr. Ent. Soc. Lond. Ill, 1841, p. 17. — Brevis, 

 lata, subrotundata, sat convexa, nitida, rufo-testacea ; elytris sat crebre, distincte 

 sed subobsolete punctatis. Long. \l, lat. 1 m.m. 



The clypeus is broadly rounded in front 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 coxte exhibiting only a few obsolete fine punctures. 



'I'he 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 j^unctatus ; prothorace basi utrinque vix 

 sinuato. Long. \l, lat. If m.m. 



The clypeus in front is broad and gently rounded, extremely finely margined ; 

 the punctuation of the hind coxse 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,satconvexus, 

 pallidecastaneus, nitidus, elytris suturainfuscata; prothorace fere la^vi, basi utrinque 

 i-inuato, angulis posterioribus acutis ; elytris crebre obsolete punctatis. Long. 21, 

 lat. Ig 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 



