Strumigenys orchibia

Strumigenys orchibia (Brown, 1953) [12] New records. BRAZIL, Bahia, Una, Oiticica, − 16 ◦ 40 ′ 35 ′′, − 39 ◦ 06 ′ 26 ′′, 01.v.2009, (J.R.M., J.C.J.A.) [one worker] [5649]. Unacau, − 15 ◦ 05 ′ 21 ′′, − 39 ◦ 17 ′ 42 ′′, 11.ii.2000, (Santos, J.R. dos) [one worker]. Comments. We recorded Strumigenys. orchibia [12] for the first time outside the Amazon region, in the city of Una, Bahia, Brazil, in Atlantic Forest biome (Figure 3 A, B). The Una population shows some differences from the holotype locality (Figure 3 C, D), namely smaller total size, lower mesopleuron with faint reticulation and small smooth areas (rather than strongly reticulate), basigastral costulae occupying less than a quarter of the first gastral tergite, dorsum of head with less dense ground pilosity. The pilosity of specimens from both regions is highly comparable, with S. orchibia exhibiting lower abundance of pilosity on the first gastral tergite. In the specimen from the Atlantic Forest, this trait is also evident in the ground pilosity of the head. The scarcity of specimens poses a challenge on whether these two forms represent merely geographic variations of S. orchibia or distinct species.