128 
Psyche 
[ June-September 
Diptera has been changed as a result of Alexander's inves- 
tigations. Professor Bradley has not accepted, however, 
the identification of Cu2 made by several recent workers 
(Tillyard, Martynov, Imms). The author maintains that 
Comstock and Needham originally designated as 1A the 
vein which these investigators call Cu2 and that the original 
name (1A) should be retained. If it be true that the vein 
was independent of Cul in the ancient insects, then the 
terminology of Comstock and Needham should of course be 
used. But if the vein arises from the stem of Cul and is 
therefore a part of the cubital system, I believe it should 
be designated the posterior cubitus (CuP), as suggested by 
Martynov. Unfortunately, our knowledge of the convexity 
and concavity of the veins in the Paleozoic insects is very 
meagre, most of the insects of that horizon having been 
described before the significance of that aspect of the wing 
was realized; but I believe that what little evidence is at 
hand points definitely to the conclusion that 1A (of Com- 
stock) originally arose from the stem of the cubitus. 
F. M. Carpenter. 
