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A series of ProbolomyrmexHNS from Guinea, originally housed in the Santschi collection but subsequently distributed, has been mentioned several times in the literature under the name filiformis MayrHNS, following Santschi (1914). I have retrieved three specimens of the original seven in this series and find them to be representative of a new species , here described.
HL, 0.61 mm.; HW, 0.41 mm.; SL, 0.38 mm.; CI, 67; SI, 93; WL, 800 mm.; PW, 0.30 mm.; dorsal petiole width, 017 mm.; petiolar node index, 57; petiole height, 0.31 mm.; petiolar node length, 0 - 25 mm.; lateral petiolar index, 84. General features are shown in the figures. Close to P. filiformisHNS, but differing from it in the following characters: (1) Smaller size, with relatively broad head, short scapes, and narrow, shorter petiolar node - as indicated in the above dimensions. (2) Punctural element of sculpturation more distinct (shagreening developed on all body and appendage surfaces, as in filiformisHNS). Head capsule with moderately distinct superficial punctures, about 0 005 mm. in diameter, separated by distances about equal to their average diameter; those on sides and postgenal areas most distinct. Puncturation of entire pronotum and remaining mesosomal dorsum similar to frons; punctures of mes- and metepisterna larger and more distinct. Petiole and first 2 segments of gaster with larger shallow punctures, about 0.01 mm. in diameter, separated by distances averaging about half this value. (3) Concavity of declivitous propodeal face, viewed from above, about onequarter as deep as distance separating dorsal points of propodeal lamellae. (4) Subpetiolar process lacking an acute posteroventral tooth. When viewed from above, no trace of a median emargination of the posterior flange of the node.
Figs. 8 - 16. - African species of Probolomyrmex. (8 - 10) P. filiformis Mayr: (8) lectotype worker, mesosoma and petiole; (9) paralectotype worker, subpetiolar process; (10) lectotype worker, head. (11, 12) P. guineensis sp. n. , holotype worker: (11) head; (12) body, side view. (13, 14) P. brevirostris (Forel), holotype worker: (13) head; (14) body, side view. (15, 16) P. parvus Weber, holotype queen: (15) head; (16) body, side view. Scale line equals 10 mm.
P. guineensisHNS resembles filiformisHNS in all other respects, apart from slightly paler coloration. The three apical maxillary and the terminal labial palpal segments are proportioned as in P. angusticepsHNS.
Two paratype workers agree with the holotype in all essential characters, including details of the measurements and indices.
Holotype [[ worker ]] and 2 [[ worker ]] paratypes, Guinea: Nigorie, Kakoulima (Silvestri). The holotype is deposited in the Naturhistorisches Museum, Basel, paratypes in the British Museum (Nat. Hist.) and the Museum d'Histoire Naturelle, Geneva. There are differences in the original labels on these specimens. That of the holotype reads: Nigorie, Kakoulima (Silvestri); the Geneva Museum specimen has: Kakoulima 12 Ag. 1912; and the British Museum one has: French Guinea - d. F. Santschi - G. A. (presumably G. Arnold) - 1914.
Found most commonly in these habitats: 16 times found in rainforest, 3 times found in rainforest, marsh clearing, 1 times found in remnant ravine forest, 1 times found in littoral rainforest, 1 times found in Gallery For., 1 times found in mature wet forest, 1 times found in secondary forest.
Found most commonly in these microhabitats: 14 times sifted litter (leaf mold, rotten wood), 1 times nest under rotten wood, 1 times ex termite mound, 3 times sifted litter, 1 times dead wood sample, 0 times in ground, 1 times ex sifted leaf litter, 1 times ex leaf litter.
Collected most commonly using these methods: 14 times MW 50 sample transect, 5m, 4 times EC28 Malaise trap, 1 times search, 2 times Winkler.
Elevations: collected from 10 - 1600 meters, 403 meters average