284 SUPPLEMENT ON THE CARNIVOROUS FAMILY 



of marshes and lakes. Roesel informs us, that when the 

 time of transformation is arrived, the larva quits the water 

 and proceeds to bury itself in the earth which borders on the 

 marshes and streams. There it digs itself a cavity in the 

 form of an oval shell, in which it becomes changed into 

 a nymph, and subsequently into the perfect insect. Swam- 

 merdam also tells us that these larvae are transformed in the 

 earth, but nevertheless avows that he speaks only from con- 

 jecture. There are strong grounds, however, for the pre- 

 sumption that this is the fact, and that the dytisci are purely 

 aquatic in the larva state, that they become terrestrial in the 

 nymph form, and, finally, that in their state of perfection 

 they are, in some sort, amphibious, or live equally in the 

 water or on the land. 



To Hydatlcus of Leach we will add a new species from 

 Mexico, which Mr. Hope has named marmoratus. It is 

 black, with large yellow spots ; the antennae and the anterior 

 legs are yellow, beneath reddish. It is in the above named 

 gentleman's cabinet. Also a species of Calymhetes^ which 

 we name Loivei, and is black, varied with yellow ; the 

 elytra with punctured striae ; the head and thorax black, 

 the latter with the margin and the legs reddish. Thirteen 

 lines in length. This species is from Madeira, and is more 

 elongate than the other species. The thorax is margined ; 

 it has a palette on the middle tarsi as well as on the an- 

 terior. 



We now come to the last genus of this family, the 

 GYRiNi, which are found on the surface of the stagnant 

 waters of marshes, lakes, and ditches, where they are seen 

 to swim, and as it were, to run, usually assembled in troops, 

 and describing circles and pirouettes, with the most sur- 

 prising swiftness and agility. They very much approach the 

 dytisci, having, like them, the feet adapted for swimming. 



