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Annals of the Transvaal Museum 
Halcyon cyanoleucus. 
Halcyon {Haley onopa) senegaloides. 
Pseudhalcyon swainsoni. 
Chelicutia chelicuti. 
Chelicutona albiventris alhiventvis. 
C. albiventris orientalis. 
Ceryle rudis and C. maxima obviously belong to distinct genera. In 
the former the difference between the tips of the first primary and the 
longest secondaries is more than twice the length of the tarsus, while in 
the latter the difference is less than the length of the tarsus; the difference 
in colour and size is also very marked. The generic name of Megaceryle 
should be used for maxima. 
Corythornis cyanostigma = C. cristata (Vroeg) (cf. C. Grant, Ibis, 1915, p. 263). 
Bucerotidae 
“ Bycanistes*' cristatus (Ruppell) should be placed in a new genus 
bearing the name of Baryrhynchus, of which it is the genotype ; it differs 
from Bycanistes bucinator Temminck in size, in having a very large, in- 
flated casque, and a style of coloration more like that of Sphagolabus. 
The genus Lophoceros as now contained in standard works may be 
divided into a number of well-defined genera, as follows : 
Lophoceros, type L. nasutus : bill finely pointed, the tomia always much toothed, 
the casque well-developed in the male, equal to two-thirds of the length 
of the bill, its anterior end projecting forward above the level of the culmen ; 
tail shorter than the wing. 
Tockus Lesson, type Buceros erythrorhynchus Temminck: bill longer and more 
slender than in Lophoceros, the tomia not toothed, casque feebly deve- 
loped, consisting of a mere ridge, extending farther forward, however, 
than in Lophoceros, and disappearing in a downward slope anteriorly; tail 
of about the same length as the wing, the secondaries shorter than the 
longest primaries. 
Rhynchaceros Gloger, type Buceros melanoleucus Licht. : bill larger and stouter 
than in Lophoceros, the tomia not toothed and the casque heavy, three- 
fourths of the length of the culmen, clearly terminating anteriorly, but 
not projecting forward as in Lophoceros-, tail shorter than the wing. 
Xanthorhynchus gen. nov., type Buceros leucomelas Licht.: bill very long, 
conspicuously and evenly arching, normally not toothed, though some- 
times slightly chipped; length of the culmen about two and a half times 
the height at the nostrils ; casque forming a high ridge, evenly arching with 
the bill, from which it is marked off by a shallow groove extending to a 
point not far from the tip; wing and tail of about the same length; 
secondaries as long as the primaries. 
Nototockus gen. nov., type Toccus monteiri Hartlaub: bill still longer than 
in Xanthorhynchus, but not so conspicuously arched; tomia not normally 
toothed; casque in the form of a high ridge, extending nearly to the end 
of the bill and marked off by a deep groove, above which the casque has 
several more or less shallow grooves ; length of the culmen three times the 
height at the nostrils ; tail much longer than the wing. 
With regard to species, C. Grant {Ibis, 1915, p. 273) separates South 
African examples of Tockus erythrorhynchus under the subspecific name of 
caffer Sundevall; but as the name is preoccupied by Buceros nasutus caffer 
