94 
Psyche 
[June-Sept. 
punctiventris Roger. The location was on a dry sandstone 
bluff in Jackson County on which many colonies of S. per - 
gandei had been found. 3 
Strumigenys (Cephaloxys) medialis, sp.n. 
Worker: (PI. 3 , fig. 1 ) : Length, 2.00 mm. 
Sides of head converging anteriorly, the occipital lobes 
posterior to the antennal insertions somewhat but not sud- 
denly or strongly expanded; clypeus at greatest width 1/3 
the length of the head exclusive of the mandibles, evenly 
and broadly rounded, but narrower than in S. ciypeata; 
mandibles when closed % to 1^5 the length of the remainder 
of the head, with the stout basal teeth hidden beneath the 
clypeus, the succeeding toothless space very short, the apical 
teeth comprising 5 pair of long, acute teeth decreasing 
somewhat in length anteriorly, and merging without a gap 
into the apical series of numerous smaller teeth; posterior 
border of head deeply excised; antennal scapes broadly 
curved on the basal third; first joint of the funiculus dis- 
tinctly shorter than the fourth, the terminal joint slightly 
longer than the remainder of the funiculus. Thorax as in 
S. ciypeata; the dorsum of the mesonotum somewhat flat- 
tened, not marginate laterally ; mesoepinotal suture distinct 
but not constricted; epinotal spines acute, slightly diver- 
gent, directed backwards; infraspinal lamellae narrow, uni- 
form in width. Petiole, postpetiole and gaster as in S. 
ciypeata and related species. 
Head, thorax and petiole coarsely and densely reticulate- 
punctate, opaque; meso- and metapleura, dorsal surface of 
postpetiole and gaster smooth and shining; first gastric 
segment with numerous coarse longitudinal striae on the 
basal 1/3 ; sculpture of the clypeus much finer than the rest of 
the head, densely and finely crenulate-punctate, subopaque. 
Hairs on the clypeus numerous, erect, anteriorly curved, 
narrowly squamose at their tips, those on the sides 3^5 the 
width of the clypeus, those in the middle somewhat shorter ; 
hairs on the rest of the head sparse, longer, thin, clavate, 
1 or 2 on each side of the head very long and not clavate. 
Hairs on antennal scapes numerous, similar to those on the 
vertex of the head, curved toward the tip of the scapes; 
3 Wesson, L. G., Jr., Contributions to the Biology of Strumigenys 
pergandei Em., Ent. News, vol. 47, pp. 171-174 (1936). 
