1949] 
Brown — Amblypone 
85 
specimens were taken in very close association with sev- 
eral other workers having much less convex borders, I 
believe that the geographical basis of this subspecies 
becomes very weak. The length of the funicular joints, 
the sculpture, and the presence or absence of a tubercle 
distad of the basal tooth are also variable characters in 
both Pennsylvania and North Carolina specimens, and 
the first of these auxiliary characters is subject to dif- 
ferences brought about by the contraction of funicular 
joints into one another to different degrees at death in 
alcohol. In conclusion, Dr. Creighton’s material, while 
reasonably abundant, just happened to show a distribu- 
tional pattern which led naturally to the erection of a 
subspecies. The additional material now available shows 
so many contradictory features that montigena cannot be 
retained as a separate form any longer. 
Amblyopone ( Stigmatomma ) subterranea Creighton 
I regard this form for the present as a good species, 
though it was described as a subspecies of pallipes in 
Creighton’s 1940 paper (p. 8, fig. 4). Though the dif- 
ference from pallipes is very slight, it seems constant in 
the specimens from Kansas, and the specimen from Aus- 
tin, Texas, may also be considered as of this form instead 
of as a pallipes-subterranea intergrade. Buren has re- 
ported this form from Iowa, so the range appears wide 
in the plains states. Specimens of pallipes from Illinois 
and western Tennessee do not seem to intergrade with 
subterranea, and no true intergrades seem yet to have 
been reported from anywhere, with the exception of the 
single doubtful specimen from Texas. Though it is true, 
as Creighton states in his description, that most of the 
sculpture of subterranea is rather light, the Kansan and 
Texan specimens show rather characteristically strong 
longitudinal ruguke in the area just behind the frontal 
region of the dorsum of the head which are not quite like 
those of pallipes. The structure of the anterior clypeal 
border seems rather distinct and diagnostic also. 
Though Creighton regarded the single Arizona record 
of Stigmatomma as doubtful in 1940, there have been 
