86 
Psyche 
[June 
several collections made in that state by Mr. R. G. Wes- 
son since Creighton’s writing. Dr. Creighton has sug- 
gested to me in a letter that these specimens may provide 
a basis for reviving Wheeler’s Arizona race, but since 
these collections are not presently available to me, I 
shall provisionally accept the synonymy of this form 
under 8. pallipes pallipes. 
Subgenera of the genus Amblyopone Erichson 
In 1934, Mr. John Clark of Melbourne 1 adopted 
Wheeler’s earlier suggestion 2 that Stigmatomma Roger, 
Fulakora Mann and Xymmer Santschi were only sub- 
genera of Amblyopone Erichson. On the basis of workers 
alone, it is hard to see why any of these names should be 
maintained if the known world fauna of the complex is 
considered as a whole. An examination of the venation 
of the winged males and females of several species re- 
ferred at present to Amblyopone ( aberrans Wheeler, 
several forms of the australis-cephalotes complex) and 
to Stigmatomma ( rothneyi Forel, pallipes (Haldeman), 
pallipes oregonensis Wheeler) reveals a difference which, 
if consistent in the two groups, will serve to separate 
them satisfactorily as subgenera; I should not be sur- 
prised to find this character intergradient and thus not 
any longer separatory when more of the males and fe- 
males are known. In Stigmatomma , the second free 
abcissa of Rs (Rs FA 2), the vein which splits the cubital 
cell longitudinally, is present in its entirety (somewhat 
weak in rothneyi ), while in all the Amblyopone sensu 
stricto, this vein is entirely gone and the cubital cell 
resulting is very large and undivided. Furthermore, the 
venation of the Stigmatommas from the United States 
(not rothneyi) is more primitive in that the first free 
abcissa of M (M FA 1), the posterior part of the vein 
persistently called the “ basal vein,” is lined up or nearly 
lined up with crossvein cu-a, a condition characteristic of 
the Myrmeciini and also of at least some Mystrium 
Roger and Myopopone Roger. 
1 Clark, 1934, Mem. Nat. Mus. Victoria, No. 8, p. 27. 
2 Wheeler, 1927, Proc. Amer. Acad. Arts & Sci. 63: p. 1. 
