1906.] OF XUE TEACHEOPHONE PASSERES. 153 



In Pkilejntta tlie tuherculum onedius, Avhich forms a kind of 

 penthouse roof over the pneumatic foramen, is pevfoi-ated by a 

 small hole ; and the deltoid crest is short and but feebly developed. 

 The arm and foi'earm ai-e pneumatic. 



The intermetacarpal plate is moderately well developed, and 

 fuses along its hinder border with the metacarpal III., which is 

 slender and bowed. 



In the Pittidse only the humerus is pneumatic. The deltoid 

 crest is obsolete, but the crista inferior is well developed and 

 I'oughly triangular in shape. As in Philejntta, there is no coraco- 

 humeral gTOOve, but the ectepicondylar process is better developed 

 tlian in Phile'pitta. 



In the Pipridse the humerus only is pneumatic, the deltoid 

 crest is sliort and feeble, and the coi'aco-humeral groove is wanting. 

 At the base of metacarpal I. is a deep notch continued outwaixls 

 along the preaxial border of metacarpal II. in the form of a channel 

 for the tendon. 



None of the bones in the wing of the Pteroptochinfe is pneu- 

 matic ; the deltoid crest of the humerus is obsolete and confined 

 to the extreme proximal end of the shaft, and the ectepicondylar 

 process is wanting; the intermetacarpal plate is well developed, 

 and the preaxial border of metacarpal II. is marked by a small, 

 laterally comj)ressed, mound-shaped boss of bone. 



As in Pteroptochus, so in Hylactes the wing is non-pneumatic, 

 and the deltoid crest of the humerus is feebly developed, while the 

 radial and ulnar condyles are set close together. 



Metacarpals II. and III. are unusually broad and set close 

 together, reducing the space between to a mere slit. 



Of the subfamilies Formicariinae, Dendrocolaptinse, and Synal- 

 laxinse, I can say nothing that would be of use. The wing 

 here presents a great general similarity, and it is impossible to 

 say, at present — owing to the lack of skeletons, — whether the 

 slight differences which can be made out are due to individual 

 vai'iation, or whether they obtain throughout whole genera. 



viii. The Pelvic Limb, 



The pelvic limb in some respects resembles that of the Eury- 

 Ifemidse. Although the different groups herein described do not, 

 in this matter, differ very widely one from another, yet this limb 

 pi-esents a greater range of variation than is found in the case of 

 the wing. 



In the Pipridse only is the femiu' pneumatic, in this matter 

 agreeing with the Cotingidse ; the fibular crest is short, and the 

 fibula continued far down the leg in the form of a delicate style ; 

 the cnemial ci'ests are moderately well developed. The Ph. I. of 

 D. IV. is less than half the length of Ph. I. D. III. 



The most striking feature perhaps about the Philepittidse is the 

 oblong, more or less quadrangular shape of the entocnemial process, 

 which rises directly from the level of the articulai- surface of 



