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PROCEEDINGS OF THE CALIFORNIA ACADEMY OF SCIENCES 
Series 4, Volume 65, Supplement II 
quent revisionary work on the genus (Wagner et al., 2018) revealed that some Angolan Acantho- 
cercus are referrable to A. cyanocephalus, a long-forgotten name proposed by Falk (1925) based 
on Angolan material, but without a precise type locality. Southern Angolan and northern Namibian 
specimens referred to A. cyanocephalus by Wagner et al. (2018), however, represent an unde¬ 
scribed lineage, treated here as Acanthocercus sp. (see below). Loveridge (1957) erroneously syn- 
onymized Stellio nigricollis cited by Bocage (1866a) from Angola with Agama cyanogaster (Riip- 
pell, 1835) and more recently Branch and Conradie (2015) also cited this species from Angola. This 
certainly represents a misidentification or a lapsus for A. cyanocephalus, since A. cyanogaster is 
restricted to the Horn of Africa and adjacent parts of East Africa (Uetz and Hosek 2017). 
Acanthocercus sp. 
Stellio atricollis: Bocage (1895a:22). 
Agama atricollis: Monard (1937b:58). 
Agama colonorum: Angel (1923:159). 
Agama cyanogaster. Loveridge (1957:195). 
Acanthocercus atricollis: Braneh (1998:218), Spawls (2010). 
Acanthocercus cyanocephalus: Wagner et al. (2018:27). 
Global distribution: The species is 
known only from Angola and adjacent north¬ 
ern Namibia. 
Occurrences in Angola (Map 246): The 
species is only known from the plateau areas in 
the southwestern regions of the country. 
Huila: “Vila da Ponte” [-14.46667, 16.30000] 
(Monard 1937b:57, 58; Wagner et al. 
2018:46); “Capelongo” [-14.88333, 
15.088333] (Wagner et al. 2018:47); “Huilla” 
[-15.05000, 13.55000] (Bocage 1895a:22; 
Monard 1937b:57; Loveridge 1957:196). 
Cunene: “Mupa” [-16.18333, 15.75000] 
(Monard 1937b:57, 58); “Mupanda” 
[-17.13333, 15.76667] (Monard 1937b:57, 
58). Cuando Cubango: “Region du Kwito, 
affluent du Kubango” [-15.162795, 
19.169871] (Angel 1923:158). “Kakindo” 
[-15.45000, 17.05000] (Monard 1937b:57, 58). 
IZ”!-: 24“E 
Map 246. Distribution of Acanthocercus sp. in Angola. 
Taxonomic and distributional notes: Wagner et al. (2018) included this taxon within their 
concept of A. cyanocephalus, however, morphological and molecular analyses of freshly collected 
material in Huila Province suggest that the southwestern Angolan populations of Acanthocercus 
represent an undescribed lineage, closely related to A. atricollis. A formal description of this new 
form is being prepared. A specimen reported by Angel (1923) from the Kwito region of Cuando 
Cubango as Agama colonorum is here presumed to be referrable to this new form, as it is the only 
large, arboreal agamid occurring in this region of Angola. 
