CORRESPONDENCE. 



HARRIS TO SAY. 



Milton, Marcli IC, 1829. 



It was throiigli inadvertence that Bytiscus thoracicus was 

 published. It is identical with your B. liherus, sent you by 

 me and described in the Journal of the Academy of Natural 



SciGIlCGS* 



A few descriptions and coarse figures are appended here, 

 upon which I beg you to offer your remarks. 



1. Zuphimn? Z>ico?or (N. E. Farmer). Nat- 

 ural size (as are all the others but the second 

 and seventh), a, mentum, concave beneath, 

 with a triangular elevation, acuminated before 

 between the deep oval fossae, containing the 

 basal joints of the external maxillary palpi. 



2. Trophi of one of the CaraUdce. [Fig. 31.] a, mentum and 

 labrum with palpi ; A, maxillae and palpi ; c, right, and d. left man- 

 dible • c, labrum. This insect measures four tenths ot an nich m 

 length ; dark castaneous above, paler beneath. Antenna monih- 

 form, or composed of very short, obconic joints ; first jomt thick, 

 one third longer than the second, which nearly equals tlie thnxl m 

 lencTth. Head large; thorax convex, obcordato-quadrate, ante- 

 rio'angles rounded, posterior ones rectangular; disk glabrous, an 

 impressed, dorsal line composed of contiguous, oblong punctures, 



