378 
Psyche 
[December 
mounted on metal stubs with Tube-Coat™, metal coated, and exam¬ 
ined in a JEOL JSM-35 SEM at 20-25 kV. 
Specimens of all other species were mounted on metal stubs with 
Tube-Coat™ and examined alive in a JEOL JSM-35 SEM at 15 kV. 
Sectioning of the trophothylax of P. g. mexicana and P. pallidus 
was carried out after refixation, but prior to post-fixation. This was 
accomplished by splitting the larva longitudinally with a hand-held 
razor blade. 
Results 
DORYLINAE 
Neivamyrmex nigrescens — (Figs. 1, 2). There is no distinct atte¬ 
nuation into a neck (Fig. 1). Ventral region of body segments bear 
similar vestiture, which includes numerous long, simple hairs and 
rows of blunt spinules, both of which continue to the dorsal surface 
(Fig. 1). Most spinules point straight outward or slightly posterior 
(Fig. 2). 
PONERINAE, PONERINI 
Leptogenys elongata — (Figs. 3-6). Ventral body region bears only 
a few minute hairs, which are most numerous on the thorax (which 
attenuates to form the “neck” (Fig. 3)). Large cone-shaped tubercles 
laterally flank this region, although they become more medial after 
the 3rd abdominal segment (Figs. 3, 4). Each tubercle bears 6-9 long, 
simple hairs approximately 1/3 of the distance from the base; this 
basal 1 / 3 is distinctly broader than the tapering apex. The apex bears 
a few blunt spinules or papillae. There are numerous rows of poste¬ 
riorly projecting spinules on the ventromedial surface of the thorax 
(Fig. 6) and a few rows on the 1st abdominal segment. A unique 
cuticular structure is found on the 3rd abdominal segment (Fig. 4). It 
is roughly ovoid, tapering posteriorly, and consists of 9-10 transverse 
ridges (Fig. 5) surrounded by small papillose protuberances. 
Pachycondyla villosa— (Figs. 7-9). The distinct neck is formed by 
the thorax and 1 st abdominal segment. The ventral body region bears 
only a few, scattered, minute simple hairs. This region is flanked 
laterally by elongate, cone-shaped protuberances bearing spinules 
and a few hairs. These protuberances gradually approach the ventral 
midline as they near the anus, thus enclosing an elongate, sub-ovoidal 
region from the neck to the anus. Spinules in short rows are formed in 
a unique arrangement on the ventral region. Those on the neck form 
