Anoplura and in the Genus Xesiotlnii?. \1\\ 



but as n iiicmoir wlii'-Ii, I believe, will iiK-Iiide this subject in 

 its scope is in course of jx-iparation by my tVieiid ]\Ir. Launcelot 

 llani.sitii, li.Sc, of tiie University of 8ytliiey, I iiifeud to do 

 no nioie here than to correct an error extant eoncerrjini^ the 

 thorax of the remarkuhle S|)ecie8 ^^es'otuim demersuy, Kello;jg'. 

 For our knowledge o£ tiiis parasite we are indebted to 

 Prof. Vernon Lyman Kello^^', of the Leland Stanford 

 Junior University, Californiaj who, so lotior ago a3 in 1903, 

 published a short description i?i the ' Biological Bulletin 

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

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

 Dr. GUntlier P^nderlein, and taken on a Kerguelen penguin, 

 Aptenodytes lonrjirostris. 



No other specimen, according to my knowledge, has since 

 been recorded, and therefore the capture of another female in 

 November \i)\'.\ on a king penguin (Aptenodi/tes sp. ? pen- 

 vanti) in the Bay of Isles, S. Georgia, by Mr. P. Stammwitz 

 (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 

 ]iro-, meso-, and metathorax in a degree unequalled elsewhere 

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

 Further on he remarks that tlie 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 if. 

 A comparative study of the thorax of Mallophaga makes 

 it certain that the tliorax of Nesiotinus 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 tliorax of S^esiolinus is short, and 

 consequently on the sternal surface but little space is left for 

 the articulation of the legs, which are relatively large 

 appendages. There is therefore a good reason why the 

 acetabular bars should be prolonged backwards, so that the 

 liind legs are suspended from the base of the abdomen. 



A similar state of affairs occurs in Menopon antennatunif 

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

 lenfrtheniii'; of the acetabular bars of both the second and 

 third j)airs of legs, so that the second pair appears to come 

 from under the metathorax and tiie third pair from as low 

 down as the second abdominal segment. 



Kellogg's interpretation allows only seven segments in the 

 ab lomen and only five pairs of spiracles. In all Mallophaga 



