A Monograph of the Formicidae of South Africa. 679 



cence is very scattered. The cheeks without exserted hairs. Pale 

 dirty yellow, the teeth on the mandibles reddish brown. 



Two specimens of this singular species were found between the 

 mandibles of C. mystaceus, var. exsanguis, from the nest in Prince of 

 Wales Bay, (Schultze). In spite of the peculiar convergence in the 

 characters of the moustache, colour etc. I cannot believe that these 

 are dwarf examples. Such a view is negatived not only on account 

 of the enormous difference in size, compared with even the smallest 

 $$ of exsanguis, but also by the shape of the head, the unusually 

 large eyes, and the dilatation at the base of the scapes (not a trace of 

 the latter is seen in mystaceus). On the other hand, a relationship 

 with cuneiscapus is unmistakable, on account of the scapes. 



The presence of this species in the nest of mystaceus, even between 

 its mandibles, makes me strongly suspect that one is dealing with 

 a parasitic form showing mimetic characters, which may be closely 

 related to cuneiscapus. If my supposition is correct, the resemblances 

 to mystaceus are due to mimetic convergence, and, on the other hand, 

 the resemblances to cuneiscapus to a phylogenetic relationship." 



C. cuneiscapus, Forel. (Plate IX, fig. 144). 

 hoc. cit., p. 29, $. 



$ media, ( 2[ ?), 7-5-8-2 mm. Slightly brownish or reddish ochreous, 

 mandibles and tarsi reddish, abdomen yellowish brown. Very 

 finely rugulose. Moderately shining, head and thorax duller than the 

 abdomen or nearly subopaque. Thorax without pilosity, abdomen 

 with a few short and yellowish hairs. Anterior margin of clypeus 

 with a thin fringe of yellowish hairs, and also one or two above near 

 its base, but without the moustache seen in the other species of the 

 sub-genus. Mandibles 5-dentate, strongly striato-punctate, pilose, 

 but without the row of long hairs on the basal margin and ventral 

 surface as in the other species. 



Head subrectangular, the corners rounded, slightly wider behind 

 than in front, a little longer than wide, the posterior margin feebly 

 concave, the sides feebly convex. Clypeus without a sloping shelf in 

 its upper part, the anterior margin straight and feebly crenulate. 

 The scape has an obtusely angular lobe on its anterior margin at the 

 extreme base (see fig., Plate IX), and extends beyond the hind margin 

 of the head by one-third of its length. Eyes placed behind the 

 middle of the sides. Dorsum of epinotum very oblique, twice as 

 long as the declivity, and merging gradually into the same. Scale 



