<> I PTERYLOGRAPHY. 



rigid, with a hook at the end leading to the hypopterum. Dorsal tract simple to the end of the 

 shoulder-blades, and here divided. Each arm is much dilated in B. armillaris (Plate V, figs. 

 1, 2), but of uniform width in B. cyanops ; in both completely separated from the rump-band. 

 On the other hand, in B. roseicollis (fig. 3), philippincnsis and Jlavifrons, the two narrow limbs 

 are united to the simple rump-band by two still narrower converging double series of feathers. 

 Femoral tracts present, either simple and short, as in B. armillaris and roseicollis, or angular, a 

 branch issuing from the end of the femoral band, and running parallel to the rump-band, as in 

 B. cyanops and philippinensis. In all there are twenty-one remiges, the first very short, the 

 second distinctly shorter than the following three, which are the longest, the longest of all being 

 sometimes the third and sometimes the fourth. 



2. Micropogon. Pterylosis exactly as in Bticco, but all the tracts narrower, and the lines 

 of union with the humeral tract at the extremity of the gular portion of the inferior tract distinct, 

 although only uniserial. The chief difference between the genera lies in the rump-band, which, 

 in Micropoffon, is cleft, either throughout (fig. 4, M. cayennensis, and viridiaurantius}, or only in 

 front (fig. 5, M. erythropygos, LICHT., and margaritaceus TEMM., PL Col., 490). The femoral 

 tract is simple in M. cayennensis and M. erythropygos, or angular, just as in Bucco, in 

 M. viridiaurantius, but with a gap at the apex of the angle. In the last-named species, also, 

 the two rows of the rump-band are at first only uniserial, and are somewhat curved throughout 

 their course. All three species have twenty or twenty-one remiges, of which the first is very 

 short, the second and third are graduated, and the fourth, fifth, and sixth, are the longest. 



In M. erythropygos I found on the heel-joint (PI. V, fig. 5) a peculiar circlet of acute 

 tubercles, such as I have also detected in young Wrynecks. 



3. Poffonias. This genus, in the form of the dorsal tract (Plate V, fig. 7), in most species 

 approaches the second group of the Buccones, and in P. unidentatus alone agrees exactly with 

 Micropogon erythropygos as regards the division and divergence of the rump-band. All the species 

 possess two-limbed, angular femoral tracts, which, however, as in M. viridiaurantius, have a gap 

 at the vertex, so that the two limbs apparently run parallel. Here, also, the pectoral tract very 

 distinctly follows two types for in P. niger, unidentatus, and senegalensis, it is narrow, and the 

 outer branch is separated to the middle from the main stem (Pl.V, fig. 8) ; whilst in P. sulcirostris 

 (fig. 6) this tract is of considerable width, and the strongly feathered outer branch is adjacent 

 throughout its course to the weakly feathered main stem. All the four species agree, however, in 

 having a temporal space close to the naked circle of the eye, which is also perceptible in Bucco 

 armillaris. They also possess twenty to twenty-one remiges, of which, in P. sulcirostris, the 

 third is pretty nearly equal in length with the fourth, fifth, and sixth, whilst in the other three 

 species it is perceptibly shorter. 



b. With twelve rectriccs, the apex of the small acute oil-gland naked, and no after-shaft 



on ilte contour-feathers. 



1 . Capita? Tracts narrow, but the feathers inserted in them on the trunk very large and 







1 [There is no doubt that the genus here denominated Capita (Bucco of Linnaeus) and its allies 

 form a family very distinct from the preceding group, and most nearly allied to the Galbulidse and 



