174 Rev. H. Clark on the Mexican Species of Hydropori. 



(A. 3.) H, striatellusy Lee. Proc. Ac. N. So. 1855, 295. 



(A. 3 a.) H. mixtusy Lee. Proc. Ac. N. Sc. vii. 296. 



(A. 3 a.) H, semirufus, Lee. Proc. Ac. N. Sc. vii. 296. 



(A. 3 a.) H. vittatus, Lee. Proc. Ac. N. Sc. vii. 296. 



(A. 3 a.) H. catascopium, Say, Trans. Am. Phil. Soc. ii. 103. 



H. interruptus, Say, Trans. Am. Phil. Soc. iv. 445. 



H. parallelus. Say, Acad. Nat. Scien. Phil. iii. 153. 

 (A. 3 «.) H. vilis, Lee. An. Lye. N. Hist. v. 

 (A. 3.) H. concinnus, Lee. Proc. Acad. N. Se. vii. 297. 

 (A. 3 i.) H. patruelis, Lee. .ibid. vii. 298. 

 (A. 3 b.) H. nubilus, Lee. ibid. vii. 298. 

 (A. 3 b.) H. discoideus, Lee. ibid. vii. 298. 

 (A. 3 ?) H. bifidusy Say, Trans. Am. Philos. Soc. iv. 444. 

 (A. 3.) H. nudatus, Say, ib. iv. 444. 

 (A. 3.) H, sericatus, Say, ib. iv. 445. 



Hydroporus, Clairv. 

 A. Thorace haud striolato. 



1. ROTUNDATI. 



1. H. Portmanni, n. sp. 



H. suhcircularis, latus, depressus, leviter punctatus ; thorace pene 

 triangulari, flavo-ferrugineo ; elytris flavis, ad suturam nigris ; 

 antennis pedibusque flavis. 



Long. corp. \^ lin., lat. ^-\ lin. 



Broad and depressed, glabrous, under a high power very 

 finely punctate, in colour ferruginous or flavo-ferruginous : 

 head broad, impunetate, black : thorax broadly transverse, 

 much narrower laterally than medially, the sides being very 

 short ; the surface is anteriorly finely punctate, more distinctly 

 so towards the base; in colour flavo-ferruginous, the anterior 

 margin being more pale than the base ; the form of the thorax 

 is remarkable — it is subtriangular, by reason of its deep scutel- 

 lary angle and its narrow sides : elytra broad, depressed, finely 

 punctate, more distinctly so than in H. Bryanstonii ; in colour 

 flavous, faintly clouded with fuseo-flavous, the sutural line being 

 distinctly black : abdomen and underside black : leffs and antennce 

 pale flavous. 



Nearly related to H. Bryanstonii ; in several distinct parti- 

 culars, however, it differs from it : it is larger in size ; it is less 

 brightly glabrous, the coloration is more distinctly pale, and the 

 punetations on the elytra are more distinct. Allied to H. pus- 

 tulatus, Melsh., which is found in North America ; it is a trifle 

 broader, not so convex, and more glabrous. ■ 



Mexico. In the cabinets of Mr. Fry and the Rev. Hamlet 

 Clark. 



