1888.] NATURAL SCIENCES OF PHILADELPHIA. 95 



It would appear that retention of hair at both junction of the fore 

 and hind leg with the body is in someway connected with se- 

 cretion and with retention of heat at these localities. (See p. 94.) 

 The black stripe which is well defined in many examples of Lemur 

 varius may extend as far as the patella or a little distal of that Ijone. 

 In the case of the child exhibiting circumscribed trichosis reported 

 by H. Ranke' a large j^ilose patch occurred at the front ot the pa- 

 tella and the upper part of the leg to its distal side. Two small 

 patches were found in line with the front of the thigh. 



The position of the pilose marks above mentioned can be consist- 

 ently placed in the same category as the thigh marks in the lemurs. 



The Collar. — The region of the head is distinguished in some of 

 the more specialized mammals by a transverse band extending from 

 the vertex down over or near the auricle (commonly in front of this 

 -appendage) and is variously dispersed on the neck. It is an inter- 

 esting region since it affords some of the most striking superficial 

 color-marks of the Quadrumana and is the probable precursor of the 

 hair of the crown of the head and of the beard in man. 



In the figures of Eschricht's and Voigt's papers on the lanugo al- 

 ready quoted, the outlines of the region of the color are clearly deter- 

 mined. 



In many species of Q uadrumana the region of the vertex of the head 

 to near the occiput, the auricle, the region below the auricle and the 

 throat and submaxillary regions are white. This disposition is con- 

 spicuous in Hylohates lar.'^ In Colobus guereza, the prevalent color 

 I)eing black, a white color is disposed as above and extends down 

 the neck to the clavicle. In Colobus vellerosus the collar is white 

 and includes the gular region. In Cercojyithecus diana, the white 

 collar is interrupted by Ijlack at the side ; the chin is furnished with 

 a Avhite goatee. The prevalent color is a squirrel gray. In Cehus 

 .hypoleucus the collar is continuous down the neck and is continuous 

 with the white scapular region and with the outside of the arm to a 

 little below the elbow. The prevalent color is black. 



In Lemur varius^ the ears, retromaxillary region and the neck 

 uniting the head lines, are white. In Lemur albifrons^ a white band, 

 'extends from the white crown over the head and thence to the 

 neck. 



1 Archiv. f. Anthropologic, 1883, 339, XIV. 

 ■^ American Museum of Natural History, No. 953. 

 3 Ibid. No. 266 

 < Ibid. No. 275. 



