L68 



Dr. A. Jefferis Tumor's Observations on 



classification of the Heteroneura, and I shall reserve the 



former for future consideration. 



It is also desirable to h><«k at the neuration from a broad 

 standpoint ami to bring it into correlation with that of 

 other related orders of insects. Without entering into 

 fuller discussion. 1 may say that 1 consider the primitive 

 lepidopterous wing possessed four main veins, which divided 

 dichotomously, together with three, or perhaps four, anal 

 veins. These veins (figs. 21 and ~2'2) were the subcostal 

 (the costal exist> as a separate vein only in fossil insects). 



Fig. 21.- Coss s cossus, Linn. 

 S. Subcostal vein. It. Radius. M. Media. On. Cubitus, a. Aieole. 

 m.c. Median cell. /.--. Radial sector, ch. Chorda. Rl, 2, 3,4, 5. 



The live radial veins. Ml, 2, 3. 4. The tour median veins. 

 Cu 1<; and 1'). The two cubital vein-;. 1A. l'A. 3A. The three 

 anal veins. 



the radius, the media, the cubit"*, the ti'st anal, the second 

 anal, which is furcate at base and probably represents two 

 coalesced veins, and in the hind-wing the third anal. The 

 nomenclature adopted is that of the Comstock-Needham 

 system, and brings the lepidopterous neuration into corre- 

 lation with that of at least several of the primitive orders 

 of insects (Tillyard. I.e., p. 173). In the accompanying 

 figures >^\ Cossus and Macrocuttara the Comstock-Needham 

 notation is given, and in the former the commonly used 

 numerical notation also. The ra<li>/* divides diehoto- 

 mouslv into the first radial and the common trunk of the 

 second, third, fourth, and fifth radial*, which is known in 



