628 EXTERNAL ANATOMY OF INSECTS. 
instances *, but not often, I believe, an insulated nervure 
intervenes between each; traversing or connecting ner- 
vures, cutting the longitudinal ones in various directions, 
ornament these wings with an infinity of areolets, causing 
them to resemble fine gauze or beautiful lace or net- 
work ; very often these areolets are quadrangular, some- 
times rhomboidal, frequently nearly circular, and differ- 
ing occasionally, as has been before observed °, in the 
different areas: it sometimes occurs that there are no 
traversing nervures ©, when the wing of course is with- 
out areolets, In the Heteropterous Hemiptera the type 
‘of neuration, as to the wing, seems borrowed from the 
Coleoptera, a further proof that these are the analogues 
of that Order amongst the Haustellata Clairv. In these 
the nervures usually are few and dispersed, and seldom 
form any closed areolets. If you examine any Scwtellera, 
Pentatoma, or Lyg@us, you may trace the uncinated, 
forked, serpentine, and insulated nervures of Coleo- 
pterous insects; in Gerris and Velia there is an approach 
to the neuration of some Homopterous species, and in Be- 
lostoma &c. the wing is reticulated by spurious nervures. 
In the Homopterous section there are several types of 
neuration; thus the Pulgore resemble the Orthoptera 
in this respect ; while the Cicada, &c., approach nearer 
to the Hymenoptera and Diptera, and have their apical 
areolets circumscribed within the margin by a traversing 
nervure; in Plata, &c., the areolets are mostly formed, 
not by traversing nervures, but by the branching of the 
longitudinal ones; in this respect they are not unlike the 
2 Stoll Spectres, ¢. xviii. f. 65. ». See above, p. 622. 
© Stoll figures Empusa as without them, ¢. ix. f. 35, but? I ae 
a nondesc. Phastnt ? without them. 
