On Synthetic Types in Insects. 



599 



Figs. 3, 4. 



these recurrcnts thronghout this interspace all along to 

 the apex of the wing is one of the best wing characters 

 in the Neuroptera. Another anomaly in the neuration 

 of Lepidoptera which occurs in 

 Hepialus and its allies, is the 

 great irregularity in the arrange- 

 ment of the branches of the me- 

 dian nervure. This is seen not 

 only where it throws off its usual 

 four nervules at the outer third 

 of the wing, but in its subdivid- 

 ing into three branches at the 

 basal third of its length to be reunited beyond by cross- 

 veins ; which is of a piece with Figs. 5, 6. 

 what we find in Polystoechotes 

 and its allies generally, where the 

 median nervure is greatly subdi- 

 vided, to be constantly reunited 

 by cross-veins, thus producing the 

 net-veined character. This for 

 the middle portion of the wing. 

 In the sub-median or inner por- 

 tion the median sends a spur or cross-vein over to the 

 internal or innermost nervure (Fig. 3, b). In the homolo- 

 gous region in Polystoechotes, (Figs. 5, 6,) which is all filled 

 up with cross-veins, there is, however, a larger one some- 

 what isolated from its neighbors, that corresponds exactly 

 to the single spur in Hepialus. In both genera the second 

 pair of wings, not much smaller than the first pair, repeat 

 throughout the particular feature in their neuration I have 

 given above, except that the median recurrent is wanting 

 in the secondaries of Hepialus. The abdomen is about 

 three times as long as the thorax in Gorgopis ; in Poly- 

 stoechotes it is over twice the length ; in both it is long and 



