1913.1 NATURAL SCIENCES OF PHILADELPHIA. 



223 



"Two abnormalities in venation may be mentioned here: One 

 male from Patzcuaro has only one antecubital on the right hind-wing, 

 situated at the level of the submedian cross-vein. One female from 

 Orizaba has the first antecubital on the right hind-wing only about 

 as far from the second as the costal space is wide, and it crosses only 

 the costal, not the subcostal, space."^ In consequence of the dis- 

 continuous antenodal in the 9 , which I have seen, and the single 

 antenodal in the d" lying on the level of the cubito-anal cross-vein 

 in each case, I regard both of them as occupying the intermediate 

 position between the two normal antenodals of Agrioninte. 



If this view should prove to be well-founded, it would follow that 

 we have evidence of the former existence of at least seven antenodals, 

 of which the second and fourth alone persist in the greater number of 

 recent Agrioninaj. In a hypothetical wing, including all the antenodal 

 cross-veins of which indications have so far been afforded by mor- 

 phology and teratology, the fourth antenodal is that which coincides 

 with the arculus, and this fact enables one to recognize it in all other 

 Agrionine wings. It is also comparatively easy to determine, in any 

 given case, the identity of each of the three antenodals which precede 

 it. But at present I can discover no means of ascertaining the exact 

 homology of the antenodals lying beyond the level of the arculus 

 which occur occasionally in one or two recent genera. 



In our reconstructed wing, then, we have seven antenodal cross- 

 veins, disposed in the following manner: Nos. 1, 2, and 3 placed 

 before the level of the arculus; No. 4 coinciding more or less exactly 

 with the arculus, and Nos. 5, 6, and 7 lying between the level of the 

 arculus and the nodus. Arranging in tabular form the material 

 which we have had under review, we get this result: 

 With antenodals Nos. 2 and 4: 



Agrioninae (with the exceptions noted below). 

 With antenodals Nos. 1, 2, and 4-' 



Chlorolestes fasciata (teratological cT). 



Paraphlehia quinta (teratological specimens). 

 With antenodals Nos. 1,2, 4, and one other: 



Podopteryx roseonotata (type cf )• 

 With antenodals Nos. 2, 3, and 4: 



Neurolestes trinervis (teste De Selys). 



Neuragrion mysticum. 



Chlorolestes longicauda (teratological d"). 



Heteragrion chrysops (teratological 9 ) . 

 ^Biol. Centr.-Amer., Neuropt., p. 127, footnote (1902). 



