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Figures 9, 18
Holotype worker. COSTA RICA: Guanacaste: Est. Pitilla, 9km S Sta. Cecilia , LN 330200_380200, 16- 18.viii.1993, P. Rios col., no. INBIOCRI0001657358 [INBC].
Paratypes. same data as holotype, no INBIOCRI001657147 (1 worker) [MZSP]; no INBIOCRI0001657202 (1 worker) [INBC]; COSTA RICA: Alajuela: Rio San Lorencito , 1990, P. Hammond col. (2 workers) [BMNH]; same data (1 worker) [MZSP]; Guanacaste: Pitilla Field Station , 2.v.1995, R. Anderson col., no. 17721 (1 worker) [WPMC]; Heredia: La Selva , 15.iv.1985, J. Memmott col. (3 workers) [BMNH]; Limon: Cerro Cocori, Fca. de E. Rojas , vi.1991, E. Rojas col., no. INBIOCRI000636130 (1 worker) [INBC]; 30km N Cariari , i.1993, E. Rojas col., no. INBIOCRI000675271 (1 worker) [INBC]; Puntarenas: Peninsula Osa, Aenn. Fund. Neotrop ., 23.vi.1997, R. Anderson col., no. 18686/18687 (5 workers and 1 gyne) [WPMC]; same data (1 gyne) [MZSP]; same data (1 worker) [CASC]; same data (1 worker) [CPDC]; same data (1 worker) [USNM]; Cerro Helado, 15km NE Rincon , 24.vi.1997, R. Anderson col., no. 18689 (1 worker and 1 gyne) [WPMC]; Peninsula Osa, Cerro Helado , 21.vi.1997, R. Anderson col., no. 18685 (2 workers and 1 gyne) [WPMC].
Worker diagnosis. Body densely and irregularly rugose; metanotal groove obsolete; teeth of propodeal lobes well developed and projected over petiolar peduncle; petiolar node high and subtriangular; pilosity on dorsum of postpetiole exceptionally dense; first tergite of gaster completely devoid of long flexuous hairs.
Holotype measurements. HL 0.72; HW 0.74; ML 0.24; SL 0.43; EL 0.16; WL 0.84; PSL 0.19; PL 0.35; PPL 0.18; GL 0.88; TL 3.21; CI 102; SI 58; OI 21.
Worker measurements (n=20). HL 0.66-0.72; HW 0.65-0.74; ML 0.22-0.25; SL 0.39-0.46; EL 0.13- 0.17; WL 0.76-0.87; PSL 0.16-0.19; PL 0.31-0.36; PPL 0.16-0.19; GL 0.85-0.94; TL 2.98-3.32; CI 98-102; SI 58-66; OI 20-24.
Gyne measurements (n=5). HL 0.65-0.79; HW 0.65-0.79; ML 0.21-0.24; SL 0.39-0.44; EL 0.17-0.20; WL 0.87-1.06; PSL 0.16-0.20; PL 0.36-0.43; PPL 0.17-0.24; GL 0.96-1.12; TL 3.24-3.86; CI 100-102; SI 56-61; OI 26-27.
Worker description. Color dark brown to black, with lighter appendages. Body densely covered by vermiculate short rugae, forming irregular areolae on head and promesonotum, and slightly sparser on mesopleura and lateral surfaces of propodeum; mandibles with short longitudinal striae restricted to basal portion; petiole and postpetiole irregularly rugose. Abundant pilosity on head and promesonotum dorsum; dorsum of petiolar node with about six long hairs; dorsum of postpetiole densely covered by long flexuous hairs; first gastral tergite entirely devoid of long hairs.
Head as long as broad, with vertexal margin weakly convex; frontal lobes subquadrate; eyes with about seven facets on maximum diameter. Promesonotum elevated well above the level of propodeum in profile; metanotal groove virtually obsolete; propodeal spines straight; teeth of propodeal lobes widen basally and slight longer than the half-length of propodeal spines. Petiolar node elevated and subtriangular in lateral view; postpetiole strongly convex dorsally and without ventral projections.
Gyne. Similar to worker. In addition, eyes with around 12 facets at maximum; wings with the basic pattern of venation for the genus; propodeal spines and teeth of propodeal lobes reduced; petiolar node comparatively lower; ventral face of postpetiole moderately projected; surface of first gastral tergite covered by long flexuous hairs, relatively dense anteriorly, becoming sparser posteriorly.
Etymology. This species is named in honor of Dr. John "Jack" Longino in recognition of his many years of devoted work on the ants of Costa Rica and for his valuable support during the elaboration of this work.
Comments. The well developed teeth of propodeal lobes allied to the dense pilosity on postpetiole dorsum separate this species from the related Lachnomyrmex amazonicus,HNS L. nordestinus,HNS L. plaumanniHNS, and L. victoriHNS. Gynes of L. longinoiHNS can be confounded with L. scrobiculatusHNS by the subtriangular petiolar node and the presence of long hairs on first gastral tergite. However, gynes of L. scrobiculatusHNS present an anteroventral projection in the postpetiole, which is absent in this species.
Additional material examined. COSTA RICA: Puntarenas: 3km N Ciudad Neily, 8°41'N 82°57'W, 210m, 31.viii.1985, P.S. Ward col., no. 7771-6 (1 worker, examined by images) [UCDC] GoogleMaps; Carara Biological Reserve, Estacion Quebrada Bonita , 30m, 23.vii.1985, J. Longino col., no. INBIOCRI002280159 (1 gyne, examined by images) [INBC] GoogleMaps; Manuel Antonio Nat. Park , 20m, 27.vii.1985, J. Longino col., no. INBIOCRI002280165 (1 worker, examined by images) [JTLC] GoogleMaps. PANAMA: Canal Zone: Barro Colorado , vii - viii.1946, J. Zetek col., no. 5239 (1 worker) [USNM]; 1976, S. Levings col. (1 worker) [MIZA]; Chiquiri: Cerro Campana , 5.iv.1995, R. Anderson col., no. 17837 (4 workers) [WPMC]; same data (1 worker) [ICNC]; same data (1 worker) [MZSP]; 20.4km North San Felix , 8.vi.1995, R. Anderson col., no. 17768 (2 workers) [WPMC].
Found most commonly in these habitats: 60 times found in mature wet forest, 51 times found in montane wet forest, 29 times found in tropical rainforest, 19 times found in tropical wet forest, 21 times found in ridgetop cloud forest, isolated peak with oak trees, 9 times found in wet forest, 17 times found in rainforest, 12 times found in montane wet forest, along ridge leading to stream, oak trees present, probably mature or old 2nd growth with relict trees, near pasture, 12 times found in mature rainforest, edge of forest near pasture and agricultural land, steep rocky terrain, 3 times found in 2nd growth forest, ...
Found most commonly in these microhabitats: 211 times ex sifted leaf litter, 40 times Hojarasca, 3 times Wet forest. Ex sifted leaf litter., 4 times Camino toma de Agua, 1 times ex sifted litter, 1 times Frente al refugio hacia el sendero entre M/14 y M/15, 1 times Entre trampa M/01 y M/02, 1 times at bait, 1 times wet forest litter, 1 times sifted litter (leaf mold, rotten wood), 1 times Litter, ...
Collected most commonly using these methods: 167 times miniWinkler, 27 times Winkler, 35 times Mini Winkler, 28 times MaxiWinkler, 6 times Berlese, 1 times bait, 1 times search.
Elevations: collected from 10 - 1200 meters, 410 meters average