COEEESPONDENCE. 



HARRIS TO SAY. 



Milton, March IC, 1829. 



It was through inadvertence that Bytiscus thoraeicus was 

 published. , It is identical with your D. libenis, sent you by 

 ine and described in the Journal of the Academy of Natural 

 Sciences. 



A few descriptions and coarse figures are appended here, 

 iipon which I beg you to offer your remarks. 



1. Zujjhium? hicolor (N. E, Farmer). Nat- 

 ural size (as are all the others but the second 

 and seventh), a, men turn, concave beneath, 

 with a triancrular elevation, acuminated before 

 between the deep oval fossae, containing the 

 basal joints of the external maxillary palpi. ^' " 



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

 labrum with palpi ; h^ maxilla and palpi; c, right, and c?, left man- 

 dible ; e, labrum. This insect measures four tenths of an inch in 

 length ; dark castaneous above, paler beneath. Antennae monili- 

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

 one third longer than the second, which nearly equals the third in 

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

 rior angles rounded, posterior ones rectangular; disk glabrous, an 

 impressed, dorsal line composed of contiguous, oblong punctures, 



