. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figures 201-202. Pristomyrmex acerosus sp. n. 201: Worker head, full-face view; 202: Worker, lateral view. workers of one species (P. minusculus) of the levigatus group. These facts indicate that ergatoid queens and pronotal anna- ments have arisen several tiines in Pristo- myrmex, respectively. Pristomyrmex acerosus sp. n. Figures 201-202 Diagnosis (Worker). Masticatory margin of mandible lacking a diastema and pos- sessing four teeth, of which the third tooth, counting from the apex, smallest; subpetiole with a pinl
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figures 201-202. Pristomyrmex acerosus sp. n. 201: Worker head, full-face view; 202: Worker, lateral view. workers of one species (P. minusculus) of the levigatus group. These facts indicate that ergatoid queens and pronotal anna- ments have arisen several tiines in Pristo- myrmex, respectively. Pristomyrmex acerosus sp. n. Figures 201-202 Diagnosis (Worker). Masticatory margin of mandible lacking a diastema and pos- sessing four teeth, of which the third tooth, counting from the apex, smallest; subpetiole with a pinlike long process. Holotifpe Worker (BMHH). TL , HL , HW , CI 99, SL , SI 88, EL , PW , AL , PPW , PPL , PPI 129. Mandibles smooth and shining. A broad-based short tooth present about midway on the basal margin of the inau- dible. Clypeus depressed, unsculptured, its anterior margin with three denticles: a median tooth and one on each side. Fron- tal carinae just extending to the level of the posterior inargins of eyes. Antennal scrobes absent. Frontal lobes weakly ex- panded basally. Eyes moderately sized. Occipital margin feebly concave in full- face view. Dorsum of alitrunk in profile convex. Pronotum unarmed. Propodeum with a pair of subtriangular short spines. Metapleural lobes rounded. Petiole node in profile high, with the anterodorsal angle higher than the posterodorsal, its anterior face subparallel to the posterior one, an- terior peduncle of the node about as long as the node. Subpetiole with a semitrans- lucent pinlike long process. Postpetiole with a rounded dorsuin. In dorsal view, petiole node subrounded; postpetiole broader than long, somewhat transrectan- gular. Dorsal surfaces of head and alitrunk sinooth and shining, except for some small, shallow hair pits. Petiole, postpetiole, and gaster unsculptured, smooth, and shining. Dorsal surface of head with numerous erect to suberect hairs. Dorsum of alitrunk with sparse hairs. T
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