1932] Female of Acamatus from Texas 77 
rounded and fringed with abundant hairs; the pygidium 
bearing two small slender spine-like processes ; sting prom- 
inent. 
Legs rather short, the femora and tibiae strongly com- 
pressed, the tarsal joints of the middle and hind legs all 
longer than broad. Fore tarsi shorter than the others, the 
first joint strongly bent, the third and fourth joints as broad 
as long. Claws well developed. 
Smooth and shining throughout. The head with numer- 
ous rather coarse, piligerous punctures, those on the thorax 
somewhat smaller and sparser, abdominal punctures very 
much smaller and notably sparser. Head covered with 
short, erect hairs of approximately uniform length. Tho- 
racic hairs sparser and of variable length. Edges of the 
node of the petiole covered with abundant, long, erect hairs. 
Hairs on the abdomen long, very slender and appressed, 
those bordering the edges of the segments somewhat stouter 
but borne parallel to the surface of the gaster. Apical por- 
tion of the middle and hind femora with numerous rather 
long erect hairs, the remainder of the appendages covered 
with shorter hairs, these being most abundant on the tarsi 
and funiculi. 
Color, rich reddish brown throughout, the tarsi slightly 
lighter. 
Taken by Dr. Herbert Ruckes about five miles west of 
Ft. Worth, Texas. Dr. Ruckes notes that the colony, which 
was a small one, was nesting beneath a large, flat boulder. 
The female of ivheeleri subsp. dubia can readily be dis- 
tinguished from those of opacithorax and schmitti in the 
very different structure of the thorax. The prominent, me- 
dian epinotal groove which is present in both the latter 
forms is completely absent in the new subspecies. Moreover 
in both opacithorax and schmitti the mesoepinotum of the 
female gradually increases in width from the promesonotal 
suture rearward. In the female of dubia the sides of the 
mesoepinotum are parallel except near the anterior end 
where a slight constriction occurs. In addition the head 
of the female in opacithorax and schmitti is more narrowed 
behind and the concavity in the upper face of the node of 
the petiole is very much deeper and extends entirely across 
the node to its anterior edge. I have not been able to com- 
