Some Ectoparasites in tlie South African Museum. 293 



focusing shows that these rise on the under side of the head. On 

 either side of the apex of the signature is a short strong bristle 

 directed backwards. 



The antennal bands (cf. M. dimorpha), connected by a rnedianly 

 swollen transverse internal band, advance anteriorly to the somewhat 

 indefinite suture, while posteriorly they curve very distinctly inwards, 

 each bearing terminally a heavy peg-like spine. At the outer edge 

 above the first antennal joint there is a minute bristle. In front of 

 the peg-like spines referred to and before the band connecting the 

 antennals are two short bristles. 



The ocular band, especially on the inferior surface of the head, is 

 more strongly developed than in M. dimorpha. Besides the dark 

 spot before the eye there is a distinct branch running towards the 

 posterior region of the antennal band (this is more apparent below). 

 The occipital bands have a strong dark basal spot. They are set 

 widely apart and diverge considerably in their outwardly curved 

 course till they practically join with the ocular bands. There is, as 

 in N. dimorpha, a tendency to branching on the inner aspect of the 

 bands. 



Antennae deeply inset in the head ; 1st joint as long as the 

 succeeding 4 together, with a large appendage near the base. 

 The upper posterior median region with a deep excavation from 

 which rise 2 hairs. First joint a triangle with truncated apex, 

 broad at the base and appreciably narrowed where it gives rise to 

 the 3rd joint, which bears a broad sinuous appendage, furnished 

 near the apex with a relatively strong hair. Fourth joint very short; 

 5th joint nearly twice as long as the 4th. Trabeculae long, reaching 

 to about the middle of the 1st joint. Eye prominent, large, with 



1 bristle. Across the middle of the post-ocular region of the 

 head runs a row of 4 bristles, lying 1, 2, 1, in the three regions 

 separated by the occipital bands. In front of each of the median 

 pair is an extremely minute hair, while behind near the occiput are 



2 longer hairs. 



Between the eye and the base of the occipital band are the 

 following: 2 very short bristles, 2 long strong hairs, 1 long weaker 

 hair, 1 short bristle. The occiput itself is bare. 



The margin of the head from the eye to a little beyond the base of 

 the occipital band is incrassated, while the middle of the occiput is bare. 



On the ventral surface of the head, at about the level of the 

 clypeal suture, is an entire transverse membranous flap folded on 

 itself at the sides to form there knotted triangular processes dis- 

 tinctly seen from above. Between these projections the clypeus 



