4-192 Mr. C. Chubb on new toes f*webbed, web reaching disc of all but the fourth toe ; subarticular tubercles feeble; discs of fingers and toes much smaller than tympanum. The hind limb, when carried forward along the body, reaches far beyond end of snout ; tibia 6-^ times as long as broad, going 1| in length from snout to vent ; foot § length of tibia. Skin smooth above, granular below excepting the pectoral region, which is quite smooth ; a straight glandular fold from posterior corner of eye to behind shoulders ; a faint fold along forearm and tarsus. Greyish brown above, with dark transverse dorsal bands ; a narrow dark canthal streak ; barred limbs, about six bars across femur and tibia ; brownish yellow beneath, lighter on throat and breast. Measurements in millimetres. Snout to vent (30 Length of head 18 Width of head 18 Fingers 1 to 4 8, 10, 12, 10 Hind limb 105 Tibia 37 Foot , 25 This species is closely allied to H. boans, Daud., from which it differs chiefly in having a smaller tympanum, smaller choanse, and much smaller and weaker series of vomerine teeth. 15. Hyla venulosa, Laur. 16. Hyla nasica, Cope. XXIII. — On new Forms of South-American Birds. By C. Chubb, M.B.O.U., F.Z.S. Miceophila, gen. nov. The chief characters of the species that I suggest for separation as a new genus under the above title are the straight culm en, not arched or semicircular as in Sporophila, and the more rounded tail ; its small size and peculiar colora-tion also help to distinguish it. Type, M. castaneiventris (Cab.).