First sight records of White-chested Swift Cypseloides lemosi in Bolivia, with documented records of C. lemosi and White-chinned Swift C. cryptus in Peru by Ignacio Roesler, Guy M. Kirwan, M. Gabriela Agostini, David Beadle, Hadoram Shirihai & Laurence C. Binford † Received 2 May 2009 SUMMARY.—We present new records of the little-known White-chested Swift Cypseloides lemosi from northern Peru and north-west Bolivia; photographic documentation is available for one of the Peruvian records, whilst the sight-only Bolivian records represent the species’ first mention for the country. We also present a photographically documented record of the almost equally poorly known White-chinned Swift C. cryptus from north Peru, along with two previously unpublished specimen records from the same country, and discuss some aspects of the identification of both these swifts. The poorly known White-chested Swift Cypseloides lemosi, Eisenmann & Lehmann, 1962, was described from south-west Colombia, in which country there have now been records in dptos. Valle, Cauca and Amazonas, with an overall altitudinal range of 350–2,000 m (Chantler & Driessens 2000, Downing & Hickman 2002). It was subsequently discovered in north-eastern Ecuador, in prov. Napo, where the species was first noted as recently as March 1990 (Ridgely & Greenfield 2001, Howell 2002). Records in this country are from the east-slope subtropics, foothills and lowlands of Amazonia, with those in the latter region being mainly in July–August, as well as a single claim from coastal west Ecuador (Lopez- Lanús 2001). In August 1994, C. lemosi was observed for the first time in northern Peru, during a multidisciplinary survey of the Cordillera del Cóndor, with tape-recorded docu- mentation (Schulenberg & Awbrey 1997). There have been several subsequent sight records in Peru, as far south as dpto. Cusco, in Manu Biosphere Reserve (Walker et al. 2006), and well into western Amazonia at the río Yavarí (Lane et al. 2003, Schulenberg et al. 2007), mak- ing it almost unsurprising that there should have been a claim from adjacent Brazil, at Palmarí Lodge, on the east bank of the Yavarí (Javari), in Amazonas state, on 10 September 2004 (S. Hansson in Cotinga 26: 92). Lane et al. (2003) witnessed an apparently large number of C. lemosi, consorting with other swifts, on migration over the Yavarí from Brazil into Peru on 28 March 2003. However, there have been no published specimen / photographic records away from Colombia. Here we report the first observation of White-chested Swift in Bolivia, marking a new southernmost limit for C. lemosi, along with photographic records of this species and White-chinned Swift C. cryptus in Peru, as well as two previously unpub- lished specimen records of the latter from Peru. White-chested Swift Bolivian observations.—Between 27 and 29 December 2005, IR and MGA were conduct- ing ornithological field work on the east slope of the Andes between Caranavi (15 o 50’S, 67 o 33’W), in dpto. La Paz, and Rurrenabaque (14 o 26’S, 67 o 31’W), in dpto. Beni (Fig. 1). Via Ruta Nacional 3 and 8, they traversed an elevational gradient commencing at just over 600 m down to 250 m. On 28 December they observed a group of ten White-chested Swifts in Ignacio Roesler et al. 222 Bull. B.O.C. 2009 129(4) boc1294-091117-ind:BOC Bulletin 11/17/2009 4:41 PM Page 222