THE ENTOMOLOGIST. 535 



side of a small projection or tooth ; and each of the 

 lateral keels has a much larger lunate or reniforra eye, a a, 

 facetted like the eyes of insects generally, and firmly soldered 

 into the substance of the shield, like the dead-eyes on the 

 deck of a ship, but partially concealed by the keel, of which 

 they may be said to form a part. The second section of the 

 shield (2) is much narrower than the first, and also narrower 

 behind than before; it terminates in a concave posterior 

 margin ; its circumscription is somewhat triangular, but very 

 obscurely so ; the sides are oblique, and each bears twelve 

 sharp teeth, six of which, placed alternately, are fixed, and 

 constitute an absolute portion of the shield itself, while the 

 other six are longer, and are articulated to the shield, but the 

 articulation is rigid, and imperceptible when the animal has 

 been dead for some time. The third section is a narrow, 

 solid, trigonal, scabrous, bayonet-like, instrument, having the 

 appearance of a tail, and gradually tapering to a point (3). 



Edward Newman. 



Notes on the Oxyura. — Family ]. Plaiygasieridce. 

 By Francis Walker, Esq. 



Ii'HiTEACUELUS Lae, malc. 



