ON MACKAYIA DIMORPHA 251 



On the evidence of the above figures I think we may 

 fairly claim that the Pheasant is likely to be of use in the 

 checking of the ravages caused by the Heather Beetle, and 

 may be classed with the Blackcock as a beneficial visitor to 

 our grouse moors. 



ON MACKAYIA DIMORPHA, A NEW GENUS 

 AND SPECIES OF MALLOPHAGA FROM THE 

 MANX SHEARWATER. 



By James Waterston, B.D., B.Sc. 



{Read at the International Congress of Entomology, Oxford, 

 7th August 19 1 2.) 



Tin. Mattophaga found on the various species of Tubinares — a 

 group of birds including the Petrels, Fulmars, Albatrosses, Shear- 

 waters, etc.— have furnished some of the most noteworthy ectopar- 

 asites hitherto investigated. Besides more ordinary forms, such as 

 Docopliorus, Lipcurus, and Menopon^ there have been described 

 from the hosts referred to, the peculiar genera Giebelia? Philoceanus % 

 Ancistrona, etc., which are not only morphologically very distinct, 

 but of importance, alike for the phytogeny and for the distribution 

 of the order. It was therefore with great interest that the writer, 

 some two years ago, received from a correspondent a consignment of 

 Philopterida? taken on Puljinus anglorum. In this material two 

 species were represented, viz., a single <$ Docophorus, sensu stricto, 

 and eight specimens of a form to which neither specific nor generic 

 place could then be assigned. With two of the Philopterids 

 hitherto reported from species of Puyinus, viz., Giebelia mi raid lis, 

 Kellogg, and Docopliorus coronatus, Giebel, 2 comparison appeared 

 to be necessary. Thanks to Professor V. L. Kellogg"s excellent 

 account of Giebelia, it was possible to decide at once that the 

 insect now under discussion, though a close ally, could not 

 be referred to that genus. Giebel's description of his parasite, 

 as reported by Piaget, 3 is vague and insufficient. It is unac- 



1 Giebelia, Kellogg, New Mallophaga, pt. 1, p. 187(1896) (Type: 

 G. mirabilis). 



2 D. coronatus, Giebel, Insect. Epiz., p. 116 (1874), from Pujfinu, 

 fuliginosus. 



3 Les Pcdiculines, p. 121 (1881). 



J.X Mm A. f*V / 



