EXTERNAL ANATOMY OF INSECTS. 455 



minated paraglossce ; and I shall adopt his term. You 

 will find them frequently attached to the tongue of the 

 Predaceous beetles a , and to that of many Hymenoptera. 

 In the hive-bee and humble-bee they are short, and take 

 their origin within the labial feelers b : in Euglossa, an- 

 other bee, they are long, involute at the tips, and, what 

 is not usual with them, very hairy c : in the wasp, like 

 the lobes of the tongue, they are tipped with a callosity. 

 Under this head I may observe to you, that the in- 

 sects whose oral organs we are considering besides a 

 tongue appear likewise to be furnished with & palate [Pa- 

 latum). This, though a part of the roof of the mouth, 

 is not precisely in the situation of the palate of vertebrate 

 animals, since it seems rather the internal lining of the 

 labrum. If you take the common dragon-fly (JEsh?ia 

 viatica), you will find that the under side of this part 

 and of the rhinarium is lined with a quadrangular fleshy 

 cushion, beset, like the upper surface of the tongue, with 

 minute black tubercles, crowned with a bristle. This 

 cushion is divided transversely into two parts by a de- 

 pression ; the anterior or outer piece being attached to 

 the labrum, and the other piece to the rhinarium. The 

 former has a central longitudinal cavity, black at the 

 bottom, on the sides of which the tubercles are flat and 

 without a bristle. From its base on each side a spini- 

 form process emerges, forming a right angle with it. 

 These processes seem the antagonists of those mentioned 

 above d , that emerge from the labium. The posterior or 



a Plate XXVI. Fig. 28. i". 



11 Kirby Mon. Ap. Angl. i. t. xii. neat.f. \.hh. t. xiii./. l.ff. 



c Ibid. t.x.**. d, l.f.2.bb. 



ll See above, p. 425. 



