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Psyche 
[Vol. 92 
heads of soldiers and queens, unlike those described for any other 
ants. 
Methods 
Zacryptocerus pallens porrasi was collected on Barro Colorado 
Island (BCI) in Panama, and Z. varians was collected on Upper 
Matecumbe Key, Florida. Specimens of Z. pallens from British 
Guiana, from the Florida keys, and Z. setulifer from Ancon, 
Panama, were obtained from the MCZ collections. The micro- 
graphs were taken with an AMR 1000 A scanning electron 
microscope. 
Results 
Z. varians (Figs. 1-3). The heads of soldiers were covered with 
large, blade-like setae arched over large shallow pits. The sparse 
distribution of the pits gives the head a pock-marked appearance. 
The most remarkable feature of clean specimens was the high den- 
sity of pores 1-3 p in diameter. These are almost certainly glandular 
openings (Fig. 1). The density of pores was about 1 pore/ 350 /x 2 , and 
the total number of pores on the disc was estimated to be over 8000. 
One specimen, which appeared only slightly grimy to the eye, was in 
fact covered with a dense tangle of material (Figs. 2, 3a) which 
resembled a mass of fungal filaments (mycelia). Patches of material 
on the head of a second specimen consisted of an encrusting layer 
as well as some filaments (Fig. 3b). Examination of the mat material 
under a light microscope revealed, however, none of the branching 
or internal structure indicative of a fungal origin. We suggest that 
the filaments are material extruded through what are apparently 
glandular openings. 
Z. pallens (Figs. 4-6). To the eye, the head of the soldier shown in 
Fig. 4a appeared to be covered with a thin layer of dirt. Closer 
examination revealed that the surface was covered with irregular 
ribbons of material (Figs. 4b, 5a). Pores were visible along part of the 
central ridge (see Fig. 5b). Material seemed to be extruded in lumpy 
strands from a number of the pores (Figs. 5b, 6), supporting the 
suggestion that it is secretory in origin. 
Z. pallens porrasi (Figs. 7-9). The two soldiers shown in Figs. 7-9 
were collected from the same colony. They represent the recogniza- 
ble form of Z. pallens that Wheeler (1942) described as the variety 
