132 REPORT OM ZOOLOGY, MDCCCXLIII. 



in such a way that it appears as if the pectiuation were produced by the 

 iuuer blade (mala) of the maxillse lying beneath the mandibles. 



An interesting feature in the natural history of Gambits auratus, [com- 

 munication of thought, and co-operation,] is related by Klingelhofer. (Ent. 

 Zeit. p. 89.) 



DYTISCI. Two new species of Cy bister are characterized by Ormancey 

 (Rev. Zool. p. 831), the one named C. prosternoviridis (sic!), the other 

 C. (eneus. The latter from Brazil, and probably the former. 



A new species of Hydaticus, H. discoiclalis from Western Africa, by 

 Hope. (Ann. Nat. Hist, xi, p. 304.) 



A new species of Dytiscus, D. an.riiis, from Sitka, very like D. circnmcinctus 

 has been added by Manncrheim (Bull. Mosc. p. 218.) West wood (Trans. Ent. 

 Soc. Lond. iii, p. 203, pi. 11, fig. 2) has made known a monstrosity in a 

 male Dytiscus marr/im/lis, in which the distinctive sexual character, viz. the 

 dilatation of the tarsi, was little marked. 



A Colymbetes coriaceits with monstrous antennae, has been figured by 

 Lucas. (Ann. d. la Soc. Elite d. Pr. 2 scr. i, p. 55, t. 1.) 



Suffrian has given remarks on the peculiar conformation of the anterior 

 claws in the male Agabus bipitstitlatus. (Ent. Zeit- s. 332.) The author seems 

 to entertain a notion that there may be more than one species resembling 

 each other, with a difference of conformation in the claws, since by several 

 writers, particularly by Degeer and myself, this conformation is not noticed. 

 As far as I am concerned, this point was passed by, because it appeared to 

 me unnecessary to employ such a character in a Beetle so easily recognized. 

 As a new Silesian species, Letzner has described (Uebers. der Arb. u. 

 Verand. der Schles. Gesellsch. i. J. 1813) Agabus silesiaats, nearly allied to 

 A.gittfaftis, but more convex and more pointed at each end ; on the elytra only 

 one fenestrated spot behind the middle. In clear brooks 011 the Altvaterge- 

 birg. New species from Sitka are, Ag. dubim, and 1/ypomelm, Mannerh. 

 (Bull. Mosc. p. 221.) 



From Angola, the Reporter has characterized two new Water-beetles 

 (1. c. p. 220), Uydrocantkus notula and Hydroporus turgidus. The latter is 

 also indigenous in Egypt. 



Suffriau (Eut. Zeitung, p. 94) 'remarks that the true Hydrop. parallelo- 

 grammus of Ahrens, is not the dull, but the strongly punctured shining form 

 of this Beetle. The author is of opinion that the name Hydrop. nigrolineatus, 

 Sch., should be abolished as ambiguous, because Ahrens first described 

 Stevens's Beetle of this name as H. enneagrammus. It will, however, perhaps 

 be necessary to refer to Steveus's own much earlier description, in ' Schouh. 

 Synon Sus.' which is so clear that the species meant cannot be mistaken, 

 notwithstanding the erroneous figure accompanying it. Mulsant (Ann. d. 

 1. Soc. Roy. d'Agricul. d. Lyou, vi, p. 276) has described a new species 

 from Prance, Hydroporus Aubei. 



