380 EXTERNAL ANATOMY OF INSECTS. 
a. CommissurRa (the Commissura). A joint in the costal 
nervure of the wings of Coleoptera, where they bend 
to take a transverse fold *. 
b. Tenno (the Tendon). A strong bristle, or bristles 
observable at the base underneath in the under- 
wings of many Lepidoptera, which plays in the Ha- 
mus of the upper-wings ». 
c. Hamuti (the Hooklets). Very minute hooks in the 
middle of the anterior margin, observable in some 
Hymenoptera, by which the under-wing is fixed to 
the upper, to cause both to act as one organ in 
flight °. 
d, Preryeium (the Pterygium). In under-wings this is 
a small wing-like appendage, fixed at the base of 
the wing in some Lepidoptera 4. 
e. Auta (the Winglet). A small concavo-convex sca- 
rious appendage, fixed behind the wings at their 
base, in many Diptera ¢. 
Jj. Haters (the Pozsers). Small capitate processes or 
organs, observable under the wings of Diptera, at- 
tended by a spiracle *. 
B. Merapnysteca (the Metapnystega). A corneous 
scale or lamina that covers the pneumatic organs 
in the Metathoraz, situated sometimes in the Pleu- 
r@, as in the Coleoptera ; at others in the Postfre- 
num, as in Tenthredo L.; and sometimes, as in the 
Libellulina, between that part and the abdomen §. 
@ Prate X. Fic. 4.0". > Linn. Trans. i. t. xiii. f. 1. 6. 3. a. 
© Kirby Mon. Ap. Angl. i. t. xiii. f. 19. 
4 De Geer ii. ¢. ix. f. 9. d. * Ibid. vi. 7. ii. f. 23. a a. 
 Prave [XG 1o pg 
® Ibid. Fic. 7. and XXII. Fic. 14. 4’. 
