154 MR. W. p. PyCRAFT OX THE OSTKOLOGY [Feb. 20, 



the shafts and extends forwards and upwards for some distance. 

 The fibular crest is long and low and the fibula produced into a 

 long, needle-like style. The basal phalanges a.gree in length with 

 those of the Pipridre. 



In the Pittidfe the en to- and ectocnemial crests are linguiforni 

 and moderately well developed. The hypotarsusis small, and the 

 outer border of the plantar surface of the tarso-metatarsus bears 

 a long sharp ridge oi- keel. 



In PterojJtochus — Conopophagidte — the great trochanter of the 

 femur takes the form of a knife- like crest, bounded on either side 

 by a deep pit ; while the inner tibial condyle terminates in a 

 sharp hook-like process. The ento- and ectocnemial crests of the 

 tibio-tarsus are almost claw-like and of considerable size, and the 

 fibular crest is moderately high and stout. The tarso-metatarsus 

 has a deep and prominent keel running along the outer border of 

 its plantar surface ; and has Ph. I. D. IV. less than half the length 

 of Ph. I. D. III. 11. 



Hylactes has the inner condyle of the femur produced into a 

 blunt spur. The ento- and ectocnemial crests of the tibio-tarsus 

 are well developed, the outer being rather unusually lai'ge. Deep 

 ridges on either side of the tarso-metatarsus give the plantar 

 surface a trough-shape : there are but two tunnels in the hypo- 

 tarsus, and Ph. I. of D. II. III. IV. are subequal. 



The femur is pneumatic only in Dendrocolaptes , and in this genus 

 the ento- and ectocnemial and fibular crests are not strongly 

 developed ; and in XiphorhyncJms they are almost obsolete. In 

 this last genus there is a small but sharply defined tubercle above 

 the outer condyle of the tibio-tarsus, and a bony loop immediately 

 below the inner cotylus of the tai^so-metatarsus. In PseudocolajJies 

 the ectocnemial crest is well developed, the entocnemial moderately 

 so ; the proximal end of the shaft of the tibio-tarsus is bent upon 

 itself and the fibular ridge though short is well developed. The 

 tarso-metatarsus is trough-like behind, and has a bony tendon 

 bridge immediately under the inner cotylus. In Homorus and to 

 a less extent in PsevdocolapUs the ento- and ectocnemial crests 

 are well developed, but do not extend far down the shaft ; the 

 extensor bridge is very wide, and bounded on its inner side by a 

 short bridge "running up the tibial shaft and terminating in a 

 tubercle ; while a similar but shorter ridge runs up the outer side 

 of the shaft. The fibula is unusually perfect, extending down as 

 a long, almost filamentary, splint to within a short distance of the 

 fused tarsals. Below the inner cotylus of the tarso-metatarsus is 

 a tendinous bridge as in Fseudocolaptes. 



The size and disposition of the distal trochlese of the tarso- 

 metatarsus in these groups demand a short description. As in 

 the Eurykemida3 generally, they lie all in the same plane, and give 

 the shaft immediately above them a conspicuously flattened 

 appearance. But while in the Eurylsemidse the fused metatarsals 

 are indicated by three very well-marked grooves immediately above 

 the trochlecG, all trace of these separate elements is obliterated in 



