Anoplura and in tlie Genus Nesiotiiiu?. 173 



but as a memoir wIiIl-Ii, I believe, will inclnde tliis subject in 

 its scope is in course of preparation by my friend Mr. Launcelot 

 Harrison, B.Sc, of the University of Sydney, I intend to do 

 no 11101 e liere than to correct an error extant concerning' the 

 lliorax of the remarkal)le species JVesiotutuf demersu", Kellogg'. 

 For our knowledge o£ tli's parasite we aie indebted to 

 Prof. Vernon Lyman Kellogg, of the Leland Stanford 

 Junior University, California, who, so long: ago as in 1903» 

 published a short description in tlie ' Biological Bulletin 

 of the Marine Laboratory at Woods Hole, Mass.' (vol. v. 

 p. 89, 1903), of a single female specimen received from 

 Dr. Guiither Enderlein, and taken on a Kerguelen penguin, 

 Apteiiodytes lungirostris. 



No other specimen, according to my knowledge, has since 

 been recorded, and therefore tiie capture of another female in 

 November 1913 on a king penguin (Aptenodi/tes sp. ? pen- 

 vanti) in the Bay of Isles, S. Georgia, by Mr. P. Stammwit;^ 

 (who accompanied the late Major Gerald Barrett-Hamilton on 

 his whaling expedition) is worthy of being placed on record. 



Kellogg remarks that one of the distinguishing features 

 of the genus and species is "the complete distinctness of the 

 ])ro-, meso-, and metathorax in a degree unequalled elsewhere 

 among the known Mallophaga, unless it be in 'Trinoton," 

 Further on he remarks that the meta-segment is " nearly as 

 wide as the first (widest) abdominal segment,''' and so resembles 

 an abdominal segment. 



No particular reasons are adduced in favour of this singular 

 interpretation, and all Mallophagan morphology is against it. 

 A comparative study of the thorax of Mallophaga makes 

 it certain that the tliorax of Nesiofinus consists of pro- and 

 metathorax, the mesothorax being quite absent, and that 

 Kellogg has mistaken the first segment of the abdomen for 

 the metathorax. The thorax of Nesiotinus is short, and 

 consequently on the sternal surface but little space is left for 

 the articulation of the legs, which are relatively large 

 appendages. Tiiere is therefore a good reason why the 

 acetabular bars should be prolonged backwards, so that the 

 hind legs are suspended from the base of the abdomen. 



A similar state of affairs occurs in AlenojJOJi antennatum, 

 Kell. & Paine, where the short thorax has involved a 

 lengthening of the acetabular bars of both the second and 

 third pairs of legs, so that the second pair appears to come 

 from under the metathorax and the third pair from as low 

 down as the second abdominal segment. 



Kellogg's interpretation allows only seven segments in the 

 abiomen and only five pairs of spiracles. In all Mallophaga 



