284 MR. W. P. PYCRAFT ON THE [ Mar. 17, 
lengths of the segments of the wing. Thus, in Scythrops, the 
brachium and antebrachium are of equal length, whilst the 
manus is only a very little less in length than either of these 
segments. The brachium is longer than the antebrachium, and 
the latter is in turn longer than the hand in Cowa, Rhamphococcyx, 
Rhinococcyx, Hudynamys, Guira, and Crotophaga. 'The relative 
disproportion between the length of the brachium and ante- 
brachium is especially marked in Dromococcyx and Piaya. The 
brachium is longer than the antebrachium, but the latter and the 
manus are equal in length in Centropusand Taccocoua. In Cuculus 
and Cacomantis the brachium and manus are subequal and 
shorter than the antebrachium. In Coccystes the antebrachium 
and manus are subequal and longer than the brachium. 
The variation in the length of the wing among the Cuculi 
becomes still more forcibly illustrated when compared with the 
hind limb, the difference apparently varying with the power of 
flight. 
Tn Cuculus, Coccyzus, and Cacomantis, for example, the wing 
is considerably longer than the leg. In Chrysococcyx the two 
limbs are subequal. In Geococcyx, Crotophaga, and Couwa the 
wing is much shorter. Taking the combined length of the femur 
and tibio-tarsus of each species as a standard of measurement, it 
will be found that in Crotophaga the wing exceeds this length 
only by the distance from the middle of Ph. I. D. II. to the tip 
of the wing. In Geococcyx the wing is slightly less than the 
length of the standard. Coww has the shortest wing of all, it 
being about + shorter than the combined length of femur and 
tibio-tarsus. 
In the Musophagi the brachium is somewhat longer than the 
antebrachium, but the latter is considerably longer than the 
manus. The ulna, as in the Cuculi, bears prominent bosses for 
the attachment of remiges. 
As in the Cuculi, the collwm trochlee is very conspicuous, giving 
the distal end of the humerus an obliquely truncated form. The 
coraco-humeral groove is wanting. The proximal border of the 
crista superior is very long and concave, the distal border short 
and convex. The ectepicondylar tubercle is very small. 
The Ph. of D. III. in the Cuculi sends outwards from its post- 
axial border a prominent spur, this is wanting in the Musophagi. 
ix. THe Petyrc Lines. 
The pelvic limb in the Cuculiformes has, in common with the 
Psittaci and many Coraciiformes, a zygodactyle pes. The hypo- 
tarsus is complex, and the tibio-tarsus has an ossified extensor 
bridge. In all save Geococcyx the limb is non-pneumatic, and in 
this genus only the femur is pneumatic. 
The pelvic limb of the Cuculiformes has the 2nd and 3rd 
trochlee nearly equal in length, but the latter is conspicuously 
larger in size. The third trochlea is placed comparatively high 
