8 
Psyche 
[March 
the scape. The flange bordering it posteriorly is higher 
and the anterior surface of the lobe next to this flange is 
very concave. (See Fig. lc & Id.) Spines on the epinotum 
a little longer, varying from 1/3 to % the base. 
Hairs even more sparse ; short and coarse on head, pros- 
ternum, dorsa of thorax and petiole; finer on abdomen. 
A few scattered, very small hairs, suggestive of rudimen- 
tary pubescence, on the gastric dorsum in addition to the 
usual longer hairs. 
Fig. 1. a, left antennal lobe of Aphcenogaster treatce, anterior 
view; b , lateral view of same; c, left antennal lobe of 
Aphcenogaster pluteicornis, var. oklahomensis, anterior 
view; cl , lateral view of same'. 
Head not so coarsely rugoso-reticulate. The feeble trans- 
verse striations on the dorsum of the epinotum are almost 
immediately indistinguishable from reticulations. Petiole 
and postpetiole more faintly punctate laterally and less 
rugose above. Very fine reticulations of the first gastric 
segment extend indistinctly to the posterior edge. 
Ferrugineous throughout except the abdomen which 
varies from ferrugino-fuscous to ferrugino-testaceous with 
a tendency to be lighter at the apex. 
Female. Length 8 mm. 
Differs from the worker in having the lobe a trifle longer 
in proportion to the scape. Length of head exclusive of 
