23 
9 
10. 
a 
b 
jc 
e 
EXTERNAL ANATOMY OF INSECTS. 391 
Forrex (the Forfex). A pair of anal organs, which 
open or shut transversely, and cross each other ?. 
—Ex. Male of Raphidia. 
. Furca (the Fork). An inflected elastic anal organ, 
ending in a fork, by which the animal is enabled to 
leap >.—Ex. Podura. 
Styx: (the Styles). Rigid, exarticulate, long and 
narrow anal organs °.—Ex. Staphylinus. 
. Foxrota (the Leaflets). Rigid, exarticulate, dilated, 
leaf-like anal organs 4.—Ex. Libellulina. 
FrLoscutus (the Floret). A small, tubular, lunulate 
anal organ, with a central styles. Fulgora cande- 
laria, &c. 
Cerct (the Cercz). ‘Two short, flattish, sublanceolate, 
jointed, lateral anal organs'.—Ex. The Blattina.— 
N.B. Analogous organs are observable in the Gryl- 
lina, but usually conical and without joints. In 
Gryllus they are setiform *. 
CaupDuLz (the Caudule). ‘Two or more slender, fili- 
form or setaceous, jointed, flexile anal organsi,—Ex. 
Lepisma, Machilis, Ephemera. 
Fita (the Threads).- ‘Two exarticulate, slender, fili- 
form anal organs *«.—Ex. Machilis. 
MamMu.e (the Mammule). Anal protuberances, 
containing instruments for spinning web !.— Ex. 
Araneide. ‘They include the Fusz. 
Prats XV. Fic. 12. Z'. 
Pirate XV. Fic. 14. 1". 
Ibid. Fic. 17. N”’. 4 [bid. Fic. 15. O”. 
Thid. Fic. 13. P''. f Ibid. Fie, 23. QQ" 
® De Geer iii. t. xxii. f. 10.a a.» Ibid. ¢. xxiv. f. 2.c; and f. 11. 
1] 
Prats XV. Fic. 16. 2". k Tbid. S". a 
Ibid. Fic. 10. and Prare XXII. Fie. 16,17. 7". 
