252 THE SCOTTISH NATURALIST 



companied by any figure. The host also is different. As was 

 noted above, true Docophorus does occur on Puffinus, and this may 

 be Giebel's insect. Failing that, if one wished to establish any 

 connection between D. coronatus and the present parasite, one 

 would have to suppose that characters obviously of generic value had 

 been overlooked by Giebel in his diagnosis assigning the species 

 coronatus to the genus Docophorus. This may be the case, as 

 Giebel's species is founded on a single female, in which sex, of 

 course, the antennae are simple. Only the name coronatus makes 

 one pause. It certainly suggests such projecting labral lobes as are 

 found in Giebetia, Phi/ocea/ius, and the present insect. The point 

 could be settled only by reference to Giebel's type. On the whole, 

 however, it seems best to assume that we are here dealing with a 

 new form. In any case, whatever a future comparison of types may 

 reveal, a new genus is required for the reception of this remarkable 

 insect. 



MACKAYIA, gen. nov. 



General characters those of Docophorus, with a broad 

 transparent membranous collar or flap across the under 

 surface of the forehead. In both sexes this flap projects 

 clearly on either side of the head. The sexes are 

 heterocerous, and the anterior angles of the temple are 

 rather more rounded than in Giebelia, to which, except 

 in the antennae, this genus closely approaches. 



Mackayia dimorpJia, spec. nov. 



J. Head. — Clypeus straight or slightly rounded. Bands 

 a little curved, with one short hair anteriorly and one or two 

 minute hairs below. Of the latter, one projects underneath 

 the edge. Above, between the bands and the edge of the 

 signature, one longish hair on each side just before the suture. 

 The signature advances beyond the clypeal suture to above 

 the mandibles. Its clypeal portion bears one hair on each 

 side. The termination of the signature is somewhat 

 indistinct, as it nearly merges into a remarkable transverse 

 internal band which stretches between and connects the 

 antennals. On either side of the apex of the signature and 

 in front of the internal band, is a short, heavy, peg-like spine 

 directed backwards. The antennal bands, which are well 

 developed, curve inwards both anteriorly and posteriorly. 



