Birds of Celebes: Bucerotidae. 237 
Egg. Von Eosenberg, to whom a rotten egg of this species was brought, describes it as 
rough-shelled, dirty wliite, and of the size of a Pigeon’s egg (c 8). 
Nest. Meyer (c 9J was informed that “it makes its nest in hollow-trees or between wood 
and lays two eggs”; but particulars as to whether the female is walled in with mud 
by the male are wanting. 
Distribution. Celebes — Muiahassa (Eeinwardt a 5, Porsten c 3, etc.); Lembeh Id. (Nat. 
Coll.); Paguatt, Gulf of Tomini (Meyer c .9); Mapane (P. & P. Sarasin 2)\ Tonkean, 
E. Celebes (Nat. Coll.); Macassar (Wallace g I); Tiamba (Platen c fO); Tawaya, 
W. Celebes (Doherty g 2]. 
hli’. Elliot (I) adds “Malacca” as a locality of tliis species with Meyer’s name 
as collector, and Dr. Dubois likewise records a specimen, or specimens, in the 
Brussels Museum as having been obtained by Meyer in Malacca. Meyer never did 
any collecting in Malacca, and the notice of this locality rests upon mislabelhng due 
to other liands than his. 
The genus Hydrocissa was, as Mr. Elliot says (Bucerot. pi. XI, text), 
proposed by Bonaparte (d 1) for various species “not nearly related beyond 
the fact that they belong to the same family”. Mr. Elliot and Mr. Grant agree 
in placing them in three distinct genera, two of which, Ant/iracoceros and Ano- 
rrhimis were made by Keichenbach a little prior to Bonaparte, the first con- 
taining his Ilydrocissa momceros, pica and violacea (synonyms of A. coronatus) and 
malayana^ while Hydrocissa gaUrita is the type of Anorrhnms, a genus which 
Grant finds to be represented by this species alone. 'I'he sixth and last species 
of Bonaparte’s Hydrocissa, H. exarata of Celebes, is thus alone left in the 
genus. By Rule 5 of the Stricklandian Code Elliot would be fully justified 
in allowing the generic name Hydrocissa to stand for exarata, no type of the 
genus having been at first specified by Bonaparte, though momceros stands first 
in the list, Avere it not that four years later Bonaparte in his Conspectus Volu- 
crum Anisodactylorum, p. 2, distinctly signifies momceros as his type by placing 
that species (with its synonym, pica) alone in the genus Hydrocissa and by 
relegating exaratus to the genus Anorrhinus Rchb., thus making it unlaAvful for 
any subsequent author to transfer the name Hydrocissa to any other part of the 
original genus (see Rules of Zool. Nomencl. 1863 §5). Grant, therefore, rightly 
makes Hydrocissa a synonym of Anthracoceros ; but, as we cannot agree with him 
that Buceros exaratiis belongs to the Philijrpine genus, Penelopides, rve find it 
necessary to give it a new generic name, lihabdotorrhinus. 
R. exaratus, the sole species of this genus, has in Elliot’s opinion “no ally 
in the familv, and is remarkable for its crest-like casque, hardly to be distin- 
guishe'd from the maxilla, and is moreover peculiar for the lateral grooves run- 
ning its entire length. It ... is probably the sole survivor of a subgroup of 
this family” (f I . 
Penelopides has a small, smooth, somewhat tubular-looking epithema, and the 
basal part of the bill is furnished with a thin side-plate on one or both man- 
dibles, Avhich is notched or ribbed, as is sometimes the case in the lower man- 
