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Costa Rica, Mexico. Costa Rica: Atlantic slope to 500m and southern Pacific lowlands.
Occurs in mature wet forest habitats; nests under loose bark of rotten wood; forages diurnally.
The type of striaticeps is from Mexico. Our identification of this species as striaticeps rests on a MCZ collection from Monteverde, which E. O. Wilson compared with the type. We also compared Costa Rican material of this species with a MCZ syntype of chloe Forel 1908. The type locality of chloe is Costa Rica (La Caja, near San Jose), and we determine it to be conspecific with the Costa Rican material we identify as striaticeps. Thus, if the determination by Wilson is correct, chloe is a junior synonym of striaticeps. However, if striaticeps is later found to be a distinct Mexican species, chloe is a firm name for this species.
Types Naturhist. Mus. Wien.
Diagnosis A member of the flavensHNS group close to chloeHNS, less so to the other species listed in the heading, distinguished as follows. Major: antennal scrobes present; entire dorsal surface of head covered by longitudinal carinulae, which curve inwardly toward midline at occiput; humerus prominent and rounded in dorsal-oblique view; mesonotal convexity present, especially in dorsal-oblique view; head wider than long (Head Width/Head Length 1.03); pronotum transversely carinulate. Minor: carinulae absent from around thorax-propodeal suture.
Measurements (mm) Lectotype major: HW 1.06, HL 1.02, SL 0.56, EL 0.12, PW 0.50. Paralectotype minor: HW 0.62, HL 0.62, SL 0.56, EL 0.08, PW 0.42. Color Major: concolorous light reddish brown. Minor: concolorous light reddish brown.
Range Mexico (almost certainly tropical Mexico), Honduras, Costa Rica, and Amazonian Peru. Longino (1997) does not distinguish this species from chloeHNS, although the two are different. He reports " striaticepsHNS, " which may include both species, from the Atlantic slope to 500 m and Pacific lowlands of Costa Rica.
Biology Longino (1997) reports " striaticepsHNS, " which may include both true striaticepsHNS and chloeHNS, from mature rainforest, nesting under the bark of rotting stumps and logs. At Cuzco Amazonico, near Puerto Maldonado, Stefan Cover and John E. Tobin found a colony in a gap within mature rainforest, beneath the bark of a rotten but still hard log.
Figure Upper: lectotype, major. Lower: paralectotype, minor. MEXICO. Scale bars = 1 mm.
Found most commonly in these habitats: 7 times found in cloud forest, 3 times found in montane wet forest, 2 times found in mature wet forest, 3 times found in coffee farm, 3 times found in tropical moist forest, 1 times found in riparian forest, 1 times found in tropical rainforest, some big trees, 1 times found in riparian forest in steep ravine, 2 times found in evergreen forest, 1 times found in wet forest, ...
Found most commonly in these microhabitats: 11 times at bait, 1 times southern SR-LEP junction; rotten log with loose bark. Pheidole; nest under loose, 3 times nest in dead wood, 1 times ex rotten log (rot-hole in old treefall), 1 times nest under loose bark rotten wood, 1 times house pest, 3 times ex sifted leaf litter, 1 times at baits, 1 times column on dead wood., 1 times Walked up the Surá from the bridge just past the arboretum to LOC. Under loose b, 1 times under bark on rotten stump., ...
Collected most commonly using these methods: 9 times search, 7 times Baiting, 4 times bait, 2 times Malaise, 2 times miniWinkler, 1 times Beating, 1 times Berlese, 1 times MaxiWinkler.
Elevations: collected from 10 - 1580 meters, 882 meters average
Type specimens: Lectotype of Pheidole striaticeps: casent0916072; paralectotype of Pheidole striaticeps: casent0919787; syntype of Pheidole goeldii chloe: casent0904420, casent0904421; Syntype Pheidole chloe: jtlc000014074, jtlc000014075