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



(A. 3.) H. striatellus, Lee. Proc. Ac. N. Sc. 1855, 295. 



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

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

 (A. 3 b.) 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. bifidus, 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. 



//. subcircularis, latus, depressus, leviter punctatus ; thorace pene 

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

 antennis pedib usque flavis. 



Long. corp. 1| lin., lat. f-1 lin. 



Broad and depressed, glabrous, under a high power very 

 finely punctate, in colour ferruginous or flavo-ferruginous ; 

 head broad, impunctate, 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 fusco-flavous, the sutural line being 

 distinctly black : abdomen and underside black : legs and antenna 

 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 

 punctations 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. 



