EXTERNAL ANATOMY OF INSECTS. 635 
its posterior margin crosses or rests upon that of the 
other *. ; 
In the Dermaptera®, at least the common earwig, 
there is a triple transverse fold of the wing, and besides 
this it has numerous longitudinal ones like those of a fan, 
each of the diverging nervures representing one of the 
sticks. In the Strepsiptera the folds are only longitudi- 
nal; a circumstance which, besides the form and neura- . 
tion of the wing, sufficiently attests that its station is more 
near the Orthoptera and Coleoptera than the Diptera. 
We next come to the Orthoptera ©; in these the folds in 
general are longitudinal ; and those of the Anal Area in 
particular, either in whole or in part, exact counterparts 
of a fan: wherever there is a straight nervure, there is 
usually a fold or a tendency to it; this is the case even 
with the short oblique ones observable in the Interme- 
diate Area of Blatta: in this tribe the Anal Area, or a 
considerable portion of it, is folded under the rest of the 
wing, and the whole lies on the back of the animal, so 
that in this wing there are only two primary folds ; but 
in those with a narrower body, as Phasma, &c., there 
are more, and the Anal Area, folded like a fan, lies hori- 
zontally on the back; the Costal is vertically applied to 
the sides, and the Intermediate is between both, as in the 
tegmina*, In Gryllus, Gryllotalpa, &c., when the wings 
are folded, the end of the Anal Area projects so as to 
present the appearance of two tails *; and in that re- 
markable Chinese animal Gryllus monstrosus, in which 
these tails are very long, they are convolute like those 
® Prate XXIII. Fie. 5. b Pirate X. Fie. 5. 
© Pirate XXVIIL. Fic. 22. 4 See above, p. 606—. 
® Stoll Grillons, t. iii. c.f. L1—13. 
