AMPHIDROMUS, GROUP XVIII. 227 



of the upper whorls, interrupted by equidistant, short, oblique stripes ; 

 this interrupted band is continued on last whorl at the periphery ; 

 lip and columella pink. Compared with pictus the whorls are more 

 convex, the aperture smaller; the basal bands are sometimes absent 

 in this variety." (Fulton.) Kina Balu. 



Form . . . (pi. 64, fig. 18). With very broad and confluent 

 greenish-gray stripes, leaving very narrow vertical buff intervals ; an 

 indistinct whitish sutural zone. 



Singkawang, on the west coast of Borneo (Martens). 



B. adamsi var. C. MARTENS, Ostas., p. 357, pi, 21, f. 5 a. 



Differs from the preceding by its want of spiral bands on the base. 

 It is very widely separated geographically. 



Further inland, at Mandhor, von Martens obtained pale buff speci- 

 mens (" var. B ") with greenish-gray rather wide continuous stripes, 

 forked above, without a sutural zone. They occurred with transi- 

 tions toward the above described form, and toward the marking of 

 typical adamsi. 



Schepman (Notes Leyden Mus., xvii, 1895, p. 156) reports speci- 

 mens agreeing with this form from the foot of Mt. Tiloeng (Biitti- 

 kofer), and Mounts Dadap and Sekedau, Ketoengau River (Moret), 

 collected during the Dutch Borneo Expedition (A. adamsi ; Notes 

 Leyden Mus., xvii, 1895, p. 156). These localities are in the in- 

 terior of Dutch Borneo west and southwest. 



It is clear that forms referable to the general type of pictus occur 

 in the interior, from Mt. Kina Balu in British North Borneo to 

 western and southwestern Borneo ; and at the present stage of our 

 knowledge it is probably inadvisable to give names to isolated color- 

 forms, which are likely to prove mere individual phases of no truly 

 racial character. 



Color-form connectens Fulton. PJ. 70, fig. 69. " Differs from 

 everetti in being larger and having no basal color-bands ; body-color 

 of a light yellowish-brown. Like versicolor in size and form, but 

 distinguished from that species by its dark-colored lip and its narrow 

 reddish -brown sutural band." (A. everetti var. connectens Fulton, 

 t. c., p. 87, pi. 5, f. 17.) North Borneo. 



A Bornean specimen before me (pi. 66, fig. 46) agrees with con- 

 nectens in the dark lip and red-brown sutural band, but retains nar- 

 row traces of yellow stripes on the yellowish-umber last whorl, and 



