ii. 318;

on ugliness, ii. 354.

SCHAUM, H., on the elytra of _Dytiscus_ and _Hydroporus_, i. 343.

SCHELVER, on dragon-flies, i. 363.

SCHIODTE, on the stridulation of _Heterocerus_, i. 379.

SCHLEGEL, F. von, on the complexity of the languages of uncivilised peoples, i. 61.

SCHLEGEL, Prof., on _Tanysiptera_, ii. 190.

SCHLEICHER, Prof., on the origin of language, i. 56.

SCHLEIDEN, Prof., on the rattle-snake, ii. 30.

SCHOMBURGK, Sir R., on the pugnacity of the male musk-duck of Guiana, ii. 43; on the courtship of _Rupicola crocea_, ii. 87.

SCHOOLCRAFT, Mr., on the difficulty of fashioning stone implements, i. 138.

SCLATER, P. L., on modified secondary wing-feathers in the males of _Pipra_, ii. 65; on elongated feathers in nightjars, ii. 73; on the species of _Chasmorhynchus_, ii. 79; on the plumage of _Pelecanus onocrotalus_, ii. 85; on the plantain-eaters, ii. 177; on the sexes and young of _Tadorna variegata_, ii. 206; on the colours of _Lemur macaco_, ii. 290; on the stripes in asses, ii. 305.

SCOLECIDA, absence of secondary sexual characters in, i. 321.

_Scolopax frenata_, tail-feathers of, ii. 64.

_Scolopax gallinago_, drumming of, ii. 63.

_Scolopax javensis_, tail-feathers of, ii. 64.

_Scolopax major_, assemblies of, ii. 101.

_Scolopax Wilsonii_, sound produced by, ii. 64.

_Scolytus_, stridulation of, i. 379.

SCOTER-DUCK, black, sexual difference in coloration of the, ii. 226; bright beak of male, ii. 227.

SCOTT, J., on the colour of the beard in man, ii. 319.

SCROPE, on the pugnacity of the male salmon, ii. 3; on the battles of stags, ii. 240.

SCUDDER, S. H., imitation of the stridulation of the Orthoptera,