376 EXTERNAL ANATOMY OF INSECTS. 



/3 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 a . 

 b Neura Postcostalis (the Postcostal Nervure). The 

 second principal, and often strongest, nervure of 

 the wing b . It includes the Neurce Subcostales. 

 « Neurje Subcostales (the Subcostal Nervures). Ner- 

 vures springing from the under-side of the post- 

 costal nervure, or from each other; called the Jirst, 

 second, third, &c. in the order of their occurrence c . 

 c Neura Mediastina {Mediastinal Nerwme). 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 d . 

 d Neura Externo-media (the Externo-medial Ner- 

 vure). The third principal nervure of the wing e . 

 It includes the Neura Subexterno-media. 

 a Neura Subexterno-media (the Subexterno-medial 

 Nervure). A nervure that in some cases intervenes 

 between the externo-medial and interno-medial f . 

 e Neura Interno-media (the Interno-medial Nervure). 

 The fourth principal nervure s . It includes the 

 Neura Subinterno-media. 

 a Neura Subinterno-media (the Subinterno-medial 

 Nervure). A nervure that sometimes intervenes 

 between the externo-medial and the anal h . 



a Linn. Trans, i. t. xiii./. 2. 3. d. h Plate X. Fig. 5—15. i: 



c Ibid, a *. d Ibid. Fig. 6. k\ « Ibid. l\ 



i Ibid. Fig. 5, 6, 13.6*. g Ibid. Fig. 5—15. m\ 

 h Ibid. Fig. 5, 6,13. c*. 



