( 270 ) 



Comparison of these dimensions with lliose given in tlie talile on page 80 of 

 ihe present volume shows that, although this bird is about the same size as 

 Hi/potaenidia celehensis, the wing is considerably shorter than in tliat species, 

 although it is probably rather less reduced than in Ocydromus. 



The 'pelvis (PI. X., figs. It), 11) is very like that of a small Ocydromus, but the 

 post-acetabular portion is relatively wider and shorter, and the ilia are more widely 

 separated posteriorly; from the pelvis of Ilypottienidia the differences are of the 

 .same kind. The supra-acetabular ridge is less prominent tlian in either of the genera 

 just mentioned, but the process overhanging the i.<chio-femoral surface is well 

 developed; this surface is a much more quadrate area than in Ifypotaenidia, and 

 even than in Ocydromus, being both higiier, and, at the same time, shorter, from 

 before backwards. On the posterior margin the point of junction of the ilium and 

 ischium is marked by a shallow concavitj' only, as in Cabalu-s sylvestris and 

 Hypotaenidia, not by a deep notch as in Ocydrmnus. The pelvis of Cahalus 

 modestus is said to generally resemble that of Hypotctenidia philippinensis, 

 but to differ from it in the following points: (1) the ilia are not expanded 

 anteriorly, and (2) the ileo-neural orifices are obliterated. .Since in Kesoiitiinas 

 the ilia are considerabl}' expanded at their anterior end and the ileo-neural canals 

 are open, it appears that it also differs considerably from Cabalus in this part of the 

 skeleton. 



The pelvis of Eryihro'ninchus is remarkably similar to that of the present 

 species, but is relatively somewhat wider, particidarly in its posterior half. The 

 posterior renal fossae are shorter, the portion of the ilia forming the floor 

 of their hinder half being less developed and supported by the transverse pro- 

 cesses of two fused caudals only : in Nesoli'innas and HypoUienidia there are three 

 such vertebrae ; in Apihanapteryx and Diwphoraptei'yx there are only two, as in 

 Erythroniachus. 



The dimensions of tlie pelvis are : — 



In form and proportions the femur (PL X., fig. 12) is closely similar to that 

 of Hypotaenidia celehensis; it is much more slender and has a much less massive 

 distal end than the femur of Ocydroraus. 



The tibia (PI. X., fig. 13) also is like tiiat of //. celehensis, but is somewhat 

 stouter, thus approaching the corresponding bono in Ocydronms. 



The melalii.rsas (PI. X., tigs. 14, 15), as usual, presents the most distinctive 

 characters. Comparing it with that of H. celehemis, we find tliat, although it is 

 actually shorter, the shaft is considerably stouter, and the distal trochleae are slightly 

 more divergent; on the otlier baud, it is considerably more slender than that of 

 Ocydromus, and the distal end is relatively narrower. Tliis metatarsus, tlierefore, 

 occupies a position on the line of modification which culminates in Aptwnis, mid- 

 way between Hypotaenidia and Ocydromus. 



