558 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvi. 



though, on the whole, intermediate between D. nigra and fmca. In 

 some respects it is also intermediate in color, as the upper side, on 

 the whole, is more like that of D. fusca, while the under side is 

 approaching- that of D. nigra. 



The granulation of the skin of the head is quite characteristic. In 

 a large' series of D. fmca and nigra it was found to be perfectly 

 smooth, more or less pitted with minute pores. In all the twelve spec- 

 imens of what I take to be D. quadriniacnlata the skin on top of the 

 head as well as on the sides of the face, notably the sides of the upper 

 jaws, is distinctly granular, resembling grain leather, and this pecul- 

 iarity is equally pronounced in old and young specimens alike. 



That the specimens here mentioned really belong to Holbrook's 

 D. quadrimaculata seems certain. So far as proportions of body and 

 limbs are concerned, Holbrook's plate agrees perfectly with our spec- 

 imens. The squarish spots in the figure appear considerably more 

 regular than in the specimens before us, among which there is a very 

 great individual variation in this respect, but the dorsal pattern of a 

 couple of the medium-sized specimens is sufliciently close to show that 

 they belong to Holbrook's species. 



