EXTERNAL ANATOMY OF INSECTS. 44-3 



thoptcra order, and the Libellulina, and almost in Meloe*. 

 A fourth form is where the upper lobe somewhat resem- 

 bles the galeate maxilla just named; but consists of two 

 joints. This exists in Staphylinidce, &c. b The last kind 

 I shall notice is when the upper lobe not only consists of 

 two joints, but is cylindrical, and assumes the aspect of 

 a feeler or palpus c . This is the common character of 

 almost all the Predaceous beetles (E?itomophagi Latr,). 

 This lobe, which has been regarded as an additional 

 feeler, is strictly analogous to the upper lobe in other in- 

 sects, and therefore should rather be denominated a pal- 

 piform lobe than & palpus. Where there are two lobes, 

 the upper one is most commonly the longest; but in 

 many species of the tribe last mentioned the lower one 

 equals or exceeds it in length d . 



The lobes vary in form, clothing, and appendages. 

 The upper palpiform lobe in those beetles just men- 

 tioned, in general varies. scarcely at all inform.; but the 

 genus Cychrus (which is remarkable for a retrocession 

 from the general type of form of the Carabi L. making an 

 approach towards that of those Heteromera which, from 

 their black body and revolting aspect, Latreille has named 

 Melosomes,) affords an exception, the upper joint being 

 rather flat, linear-lanceolate, incurved, and covering the 

 lower lobe e , which it somewhat resembles. The lower 



a Plate VI. Fig. 6, 12. d"'. e'". Oliv. Ins. no. 45. Meloe. I. i. 

 f. I.e. These are what Fabricius calls galeate maxilla?, on which he 

 founded his class TJlonata. 



b Plate XXVI. Fig. 11. d'". e'". 



'• Plate VI. Fig. 3. d'". 



d Clairv. Ent. Helvet. t. i. t. xviii./. super, b. 



* Ibid. t. xix. b. This genus may be the analogue of some helero- 



