106 The Rev. Ww. Kirby on a new Order of Insects. 
malous part the Proscutellum. The different pieces which com- 
pose the- underside of the trunk exhibit no: very peculiar cha- 
racters except those remarkable processes which, projecting out 
on each side from under the body, form, in conjunction with the- 
proscutellum, a kind of rampart to enclose and protect the base 
of the abdomen ; and within which, at least in the case of Stylops 
Melitta, it appears to be retractile. ‘These processes* are equi- 
valent to what we denominate Femoralia in many insects, but 
they are unlike those of any I ever met with. In the legs.there 
is this remarkable, that the trochanters-f, especially im the 
four anterior legs, are much larger than the coxet, in which 
the latter are not easily detected. The tarsi, which have only 
four joints, are distinguishable from those of most other insects 
from their being without claws; for what Mr. Sowerby and I, 
in Stylops Meliti«, mistook for claws$ was merely the bifid apex. 
of the terminal joint]. Another remarkable circumstance ren- 
ders the tarsi in both these genera conspicuous, the underside o£ 
the three last joints is covered by large membranaceous hairy 
vesicles, which, as I gather from Professor Peck's figure**, in the 
living or recent insect are inflated ; but in old specimens, the air 
escaping, they become flaccid, and look rather like an appendage: 
than a part of the foot. De Geer has observed, both with 
respect to Thrips physapus and several. Acari-j, that their foot 
is terminated by a vesicle. And, lastly, to close this long dis- 
cussion, the last ventral segment of the abdomen ends in a. 
* Tas. IX. fig. 1. 2. ll. fig. 5. bb. fig. 6. aa. 
t Fig. 2. u. q. fig. 3. e. fig. 5. dd. fig. 6. c c. fig. 7. a. 
$ Pig. 2. t. 3. d. 5: ec. 6. b. 
$ Mon. Ap. Angl. i. tab. 14. n. 11. fig. 1. Sow. Brit. Miscell. n. 9. pl. 45. fig. 4. 
| Tas. IX. fig. 9. a. q Fig.8.8. c. ** Tas. VIIE fig. 13.. 
++ Tom. ii, p. 7. pl. i. fig. l. ppp. Tom. vii. p. 84, pl, 9. fig. 6. 7. Ll. and 
"Pe 19. n. T. 
* 
reflexed 
