349 
on Dr. Jerdon’s ‘Birds of India? 
quite distinct. The specimen is still unique, and the species 
should be looked for in Butan (cf. Ibis, 1865, pp. 30, 31). v 
136. Ceryle rudis. 
Common in China, and doubtless the "white-spotted species” 
noticed in Siam by the late Sir R. H. Schomburgk (Ibis, 1864, 
p. 247)*. 
139. Serilophus rubropygius (Hodgson); Gould, B. As. 
pt. xxiii. pi. 
140. Homraius bicornis. 
Referred to Dichoceros , Gloger (1842), by Dr. Cabanis (Mus. 
Hein. ii. p. 173). 
The Nipalese name, " Homrai,” for this species is derived 
from its note, which I have repeatedly heard uttered in the 
Zoological Gardens. 
141. Hydrocissa coronata (Bodd.); PI. Enl. 873; " Bu~ 
ceros violaceus , Shaw,” nobis, J. A. S. B. xxi. p. 352. 
143. Hydrocissa affinis is like H. albirostris , but of the 
considerably larger size of H. c'oronata. The Malayan H. con- 
vexa has the size and broader casque of H. albirostris, combined 
with the wholly white three outer pairs of rectrices of H. coronata. 
As compared with other races, differing in size only, the disparity 
between H. affinis and H. albirostris is less marked than between 
Hirundo rupestris and II. concolor, Phyllornis javensis and P. 
cyanopogon, Himalayan Turtur rupicolus and T. auritus , but 
equivalent to that in many other instances wherein the distinc¬ 
tion is currently recognized, and greater than in some, as Turdus 
hodgsoni and T. viscivorus, T. olivaceus and T. olivacinus, Bonap.f 
* [Mr. Swinhoe makes the same suggestion, supra , p. 292.— Ed.] v 
t The following additional instances of races differing only in size may 
here he cited :—Milvus govinda and M. affinis \ Ephialtes (various) ; Alcedo 
ispida and A. bengalensis ; Megalcema philippensis and M. indica ; Cliryso- 
colaptes sidtaneus and C. delesserti ; PLemicercus canente and H. cordatus ; 
Hierococcyx sparverioides and H. nisoides ; Cucidus affinis and C. micro- 
pterus ; C. canorus , C. hhnalayanus , and C. poliocephalus) C. tenuirostris 
and C. Jlavus ; C. dicruroides and C. lugubris Caprimidgus indicus and 
C. kelaarti j C. monticolus and C. affinis ; Fregilus himalayanus and F. 
gracidus •, Pyrrhula coccinea and P. vulgaris ; Crithagra butyracea and 
C. chrysopogon ; Estrelda amandava and E. punicea ; Pratincola bicolor and 
