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Figures 16 g, h, 17 d
Worker, TL 3.74 - 4.94, HL 0.88 - 1.24, HW 0.88 - 1.34, CI 100 - 108, SL 0.82 - 0.94, SI 73 - 93, PW 0.56 - 0.72, ML 0.98 - 1.20, GL 1.00 - 1.40, GW 0.80 - 1.06.
Polymorphic. Labrum with lamellate flange developed at basal part of curvature. Anterior clypeal margin with 3 pairs of projection, the shape and size varying to reduce or fused; basically, the median pair broad and robust, inner lateral pair smaller; outer lateral pair smallest, sometimes reduced or lost; the median notch roundly concave; in some case the median paired teeth fused without median notch in major worker. Propodeal spine straight or slightly curved upward. Subpetiolar process present anteriorly; ventral margin of petiole almost straight in profile; anterior portion of petiole diverging toward midlength of petiole in dorsal view. Sculpture on head and mesosoma irregularly costate. Body color blackish.
Specimens examined: 9 workers (including 1 major), 4 km N Union Juarez , Volcan Tacann , Lower slopes 1950 m, Chiapas, Mexico (4 in UCD, 5 in BMNH).
The species shows great variation in worker caste body size, the shape of spines and the teeth on the anterior clypeal margin, but the subpetiolar process is consistently present, which is unique among the four PerissomyrmexHNS species. In addition, P. snyderiHNS is also unique in having coarser and more irregular sculptures on the head and mesosoma and dark color of the body. The degree of the protuberance of the anterior clypeal margin is less distinct than that in Asian species, even though variation exists.
The rediscovered individuals were collected from Berlese samples of a cloud forest floor of 1700 to 2000 m altitude in Chiapas, Mexico (Longino & Hartley, 1995).
Found most commonly in these habitats: 83 times found in cloud forest, 45 times found in Bosque de encino, 18 times found in 2º mesophil forest, 10 times found in 2° mesophil forest, 3 times found in oak/cloud forest, 5 times found in oak forest litter, 3 times found in cloud forest litter, 1 times found in edge of 2° mesophyll forest, 1 times found in mixed liquidambar-magnolia-pine forest, 1 times found in trans/cloud forest, ...
Found most commonly in these microhabitats: 103 times ex sifted leaf litter, 3 times leaf litter, 18 times at bait, 5 times ex sifted litter, 2 times forest litter, 1 times nest, 1 times nest under small log, 1 times leaf litter Berlese, 3 times beating vegetation, 1 times sifted litter (leaf mold, rotten wood), 1 times litter, ...
Collected most commonly using these methods: 86 times Hojarasca berlese, 72 times MiniWinkler, 18 times Baiting, 7 times berlese, 11 times Winkler, 14 times MaxiWinkler, 6 times search, 8 times Berlese/Winkler, 3 times Beating, 1 times berlesate, 1 times flight intercept trap, ...
Elevations: collected from 1500 - 2586 meters, 2247 meters average