870 MR. u. T. Por-ocK ox THE [Juue 14, 



such a character is subject to iiiili\ ithuil \ariation within specific 

 limits. 1 suspect, moreover, that O^'ilhy was correct, and, liy 

 implication, that Owen was in error, in stating that inguinal 

 glands are absent in G. ononticola, since the latter seems to be 

 nearly allied to G. maxwelli. But I cannot doubt that Ogilby 

 was wroiig in saying that pedal glands are absent in G. monticola. 



GUEVEI /EQUATORIALIS Matscli. (Text-fig. 93, A, B.) 



The cut foot of a (hied skin given to me by Dr. Christy, who 

 shot the animal in the Chagwe forest, Uganda, had a gland of 

 nearly the same structure as in G. melanorheus. The foot of this 

 specimen difi'ers in colour from that of G. maxirelli, being brown 

 all over and showing no white patch just below the false hoofs 

 on the back of the pastern and no white on its front close to the 

 ti-iangular interdigital depression. 



The similarity in the structure of their pedal glands favours 

 the view that G. melaiwrheiis and G. cequaioi^ialis may be sub- 

 specifically and not specifically distinct. 



GuKVEi MELAXORiiEUS Gray. (Text-fig. 93, C.) 



A single yoiuig specimen from Angola presented by Mr. H. F. 

 Vai'ian. 



As in G. maxineUi, the preorhital streak was lightly concave 

 below, but its curvature was less abrupt and situated farther 

 forwards than in Dr. Ansorge's example from Poituguese Guinea. 

 The streak was 22 mm. long and 1 mm. Avide, studded with a 

 single series of circular pores, from each of w-hich a single short 

 hair arose. The gland itself, when extracted, measured about 

 27 mm. long, 10 mm. Avide, and 5 mm. in vertical depth. In 

 section, both longitudinal and transxerse, it was pale externally, 

 with its central third forming a dark core. Under slight pressure 

 drops of cleai' fiuid, like liquid gum tragacanth, could be squeezed 

 from the pores. When rubbed between the fingers it became, as 

 it dried, quite sticky, giving out a faintly aromatic odour like that 

 of black-currant tea. Under hard pressure pale whitish-grey 

 mafgot-like threads could be expi-essed from the pores. 

 Ju'Tuinal glands were absent as in G. maxicelli. 

 The feet wei-e constructed as in the last-named species, witli 

 the marked diflerence that tlie pedal gland consisted of a simple 

 narrow cylindrical tulie not extending so far as the false hoofs 

 and showing no sign of ex})anding between the bones into an 

 enlarge<l laterally compressed dilatation. 



Although superficially G. maxirelli and G. mplanorheus are so 

 much alike that it lias been suggested that they be regarded 

 merely as subspecies, it appeai-s to me that the difference in the 

 structure of their pedal glands entitles the two to specific separation, 

 at all events until further examination has shown that this 

 e1mra<'ter has not the value here claimed for it. 



