CORRESPONDENCE, 



HARRIS TO SAY. 



MILTON, March It, 1829. 



It was through inadvertence that Dytiscus thoradcus was 

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

 me and described in the Journal of the Academy of Natural 

 Sciences. 



A few descriptions and coarse figures are appended here, 

 upon which I beg you to offer your remarks. 



1. Zuphium? bicolor (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 fossa3, containing the 

 basal joints of the external maxillary palpi. 



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

 labrum with palpi; A, maxilla? and palpi; c, right, and d, 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, 



