B. 
a. 
é 
EXTERNAL ANATOMY OF INSECTS. 375 
Hamus (the Hook). A Hook fixed to the Costal 
Nervure, near its base on the under-side, in the 
wings of some Lepidoptera, in which the tendon 
runs ?. 
Nevura Postcostatts (the Postcostal Nervure). The 
second principal, and often strongest, nervure of 
the wing>. It includes the Neurae Subcostales. 
. Neun# Suscostates (the Subcostal Nervures). Ner- 
vures springing from the under-side of the post- 
costal nervure, or from each other; called the jst, 
second, third, &c. in the order of their occurrence £. 
Nevura Meptast1na (Mediastinal Nervure). A usu- 
ally slender nervure, springing from near the base 
of the postcostal; between which and the costal it 
intervenes. In the Lepidoptera Diurna, however, 
it is often a strong nervure 4. 
Neura ExtTerno-mepia (the Ezterno-medial Ner- 
vure). ‘The third principal nervure of the wing °. 
It includes the Neura Subexterno-media. 
NeurA SUBEXTERNO-MEDIA (the Subexterno-medial 
Nervure). A nervure that in some cases intervenes 
between the externo-medial and interno-medial ‘. 
Neura INTERNO-MEDIA (the Interno-medial Nervure). 
The fourth principal nervure®. It includes the 
Neura Subinterno-media. 
NEuRA SUBINTERNO-MEDIA (the Subinterno-medial 
Nervure). A nervure that sometimes intervenes 
between the externo-medial and the anal *. 
* Linn. Trans. i. t. xiii. f. 2, 3. d. » Prate X. Fic. 5—15. 7. 
© Ibid. a *. 4 Ibid. Fic. 6. ke. © Ibid. /. 
f Ibid. Fic. 5, 6, 13. 5*. ® Ibid. Fic. 5-—-15. m-. 
h Ibid. Fic. 5, 6, 13. c*. 
