BOMBINATOR. 161 



Male (ventral view) and female (dorsal view) 

 specimens from near Dinant, Belgium, are figured on 

 the right side of PI. V. Ventral views of specimens 

 from the Serra San Bruno, Calabria (fig. 3), Basle, 

 Switzerland (fig. 4), and Schemnitz, Hungary (fig. 5), 

 are given on PI. VI. 



Hybrids. — Mehely has pointed out that in the few 

 places in Hungary where the two species occur 

 together, intermediate specimens are fouud such as 

 are not to be procured from other localities. These 

 specimens are no doubt hybrids. Heron-Royer suc- 

 ceeded in crossing the two species in both directions, 

 and four nearly adult hybrids are described and 

 figured by him in 'Mem. Soc. Zool. France,' 1891, 

 p. 81. These hybrids, which proved fertile, and pro- 

 duced a second generation, were nearly intermediate 

 between the parent forms, but somewhat nearer 

 B. igneus, whether the latter was the father or the 

 mother : the ventral spots were lemon-yellow on a 

 black ground ; the digits were not tipped with bright 

 yellow ; the inner finger and the inner toe were yellow 

 in one specimen, in the others the inner finger was 

 black, but the inner toe yellow. 



