386 
Psyche 
[December 
tromedial hairless area relatively wide on thorax, as in S. molesta 
(Fig. 30). Minute, posteriorly pointing spinules in short rows on 
ventromedial area of prothorax and mesothorax (Fig. 32). 
Atta texana — (Figs. 33-35). Head closely appressed to body (Fig. 
33). Leg vestiges prominent (Fig. 33). Body almost hairless. Ventral 
area of prothorax bears a medial boss bearing numerous spinules 
pointing straight outward, and 2-6 very short hairs (Figs. 34, 35); 
other spinules on prothorax point posteriorly (Figs. 34, 35); 2 pairs of 
very short hairs lateral to boss. Ventromedial area of mesothorax 
bare of hair and spinules, but flanked laterally by numerous spinules, 
most pointing straight outward or anteriorly, and 1 pair of very short 
hairs. Spinules present on succeeding segments. 
DOLICHODERINAE, TAPINOMINI 
Iridomyrmex pruinosum — (Figs. 36-38). Head appressed closely 
to body (Figs. 36, 37). Anteroventral region with short, simple hairs, 
numerous only on prothorax. A very few, minute, blunt spinules are 
located on the ventral surface of the prothorax and mesothorax; 
spinules become slightly more numerous on posterior segments (Fig. 
38). 
FORMICINAE, CAMPONOTINI 
Colobopsis pylartes — (Figs. 39, 40). Thorax stouter than in 
Camponotus rasilis. Praesaepium on 1st abdominal segment is 
covered by welt of 2nd abdominal segment (Fig. 39). Medial, hairless 
area of anteroventral region flanked by long, simple hairs (Fig. 39). 
Spinules very blunt and point posteriorly, those on lateral flanks of 
praesaepium (1st 2 abdominal segments) point postero-medially; 
rows of spinules on meso- and metathoracic segments very well 
developed and prominent (Fig. 40). 
Camponotus rasilis — (Figs. 41-43). Neck developed (Fig. 41). 
Praesaepium well developed, formed in thorax and 1st 2 abdominal 
segments (Figs. 41, 42). In some specimens, food, including some 
brown cuticular material was found in praesaepium. Ventral area of 
prothorax bears numerous long, simple or bifid hairs. Ventromedial, 
hairless area of meso-and metathorax and 1st 2 abdominal segments 
is flanked laterally by a few simple bifid hairs. Most other body hairs 
are 3-5 branched, interspersed occasionally with a few, very long 
simple hairs with curled tips. Spinules on anteroventral body region 
(thorax and 1st 2 abdominal segments) point posteriorly (Fig. 43), 
except for the most anterior portions of the prothorax where they 
point anteriorly. 
