1C)2 Mr. C. T. Regan on the 



Jlister vetuslns, TIeer, Verb. Holl. Maatscli. Wet. xvi. 58, 

 t. iii. fig. 18 (1862). 



" //. breviter ovalis, pronoto lateribus unistriato, elytra quinque- 

 striatis, stria suturaii nulla." 



Oeningen, Baden (U[)per Miocene). 



]\fote. — Histevid^e have been reported from Baltic ambci'^ 

 and from the Miocene shales of Florissant, Colorado, but have 

 not been desf^ribed. Tiie Florissant specimens, collect;ed by 

 Scndder, are in the Museum of Comparative Zoology, Gavn- 

 l»ri(lge, Massachusetts. Among the fossils collected by tlic 

 University of Colorado expeditions I have not as yet observed 

 any Histerid;e ; but very few of the Coleoptera have been 

 ciitjicallv examined. — T. D. A. C. 



XVI. — The Tlyljridhetween the Dream and the Rudd (Abramis 

 brama x Leueiscus erythrophthalmus). By 0. Tate 

 Began, M.A. 



[Plates VII. & VIII.] 



For some time I have been trying to improve the series of 

 13ritish freshwater fishes in the National Collection ; several 

 anglers and others have helped forward this project by 

 sending char, pollan, vendace, &c., and I am especially 

 indebted to Major H. Trevelyan, from whom I have received 

 a number of fishes fiom Lough Erne, including several which 

 T regard as hybrids between the bream and the rudd [Abramis 

 brama X Leueiscus erythrophthalmus) . 



Smitt (' Scandinavian Fishes,' p. 782) has noted that the 

 rudd is fond of joining as an interlo|ier in tlie spawning of 

 oilier fishes (roach, bleak, and white bream), with the result 

 that hybrids are produced. Little appears to be known 

 about the hybrid between the rudd and the common bream, 

 which is in every respect intermediate between the parent 

 species, as may be seen from the subjoined description. 



Ahi'amis hrama X Leueiscus ery throphthahnus. 



Pharyngeal teeth compressed, hooked, entire or more or 

 less crenate, in one or two series, 5 — 5 to 2 . 5 — 5 . 2 *. 



* o — in one specimen, 1 . -j — 5 . 1 in six, 1 . o — -J . 2 iu une, 2 . — 5 . 2 

 ill line, of nine examined. 



