Bulletin 3 - Peabody Museum of Natural History - Yale University

10 PEABODY MUSEUM OF NATURAL HISTORYLophodytescucullatusHybrid No. 4745Bucephala clangulaamericanaLower mandible hasalong its upper edgescorresponding serrationswhich slant inward andbackward. The anteriormostof these unite toform a continuous knifelikeedge. (Fig. 7.) Noseries of ridges extendingon outer aspect oflower mandible.Both upper and lowerteeth remain visible whendried bill is closed.Tarsus,29-31 mm.Middle toe andnail, 52Number of scaleson top of outertoe, 44-46Scales in the row alongfront of tarsus (overlying3rd metatarsal) allsimilar; central ones notdistinctly wider thanthose below. (Fig. 13.)Has distinct crest, laterallycompressed; longestnape feathers, 48 mm.Lower mandible has oneach upper edge 40 smallserrations, or lamellae, ofwhich the anterior extendbackward and inw&rd, andthe posterior directly inward.Anterior teeth notunited as in L. cucullatus.A series of 46 short externallamellae along thesuperior-lateral face ofthe lower mandible, eachtooth extending obliquelydownward and backward,as in Bucephala. (Figs.8, 11.)Closure of bill hides allthese teeth and lamellae.316144-47Scalation of left legas in L. cucullatus; ofright leg as in Bucephala.(Figs. 14, 15.)Crest fairly developed;longest nape feathers,33 mm.On each upper edge oflower mandible is a seriesof 51 serrations or lamellae,of which the posteriorextend directly inwardand the anteriorobliquely backward andinward.A series of 46 welldeveloped lamellae alongeach side of bill as inmost ducks; each ridgeextends obliquely downwardand backward.(Figs. 9, 12.)Closure of bill hides allthese ridges.38-416854-56Middle scales in therow on front of tarsusdistinctly wider than theones below, thus reducingabruptly the width ofthe outer row of scales(overlying 3rd metatarsal).(Fig. 16.)No distinct crest; longestnape feathers, 23 mm.Head, entire neck,black. Broad white patchextends from back of eyeCOLOR OF MALEEntire head (includingcrest) and neck black,not extending so far pos-Head and upper neckblack, with strong greeniridescence; large round-