Die Insekten und Arachnoideen der Kerguelen. 2 "? 7 



peculiar to the genera Menopon and Trinoton (of the Liotheidae), but the short, slender, five- 

 segmented antennae not lying in special antennal cavities identify the species as a Philopterid, 

 but one not assignable to any known Philopterid genus. The new form represents a Mcnopon- 

 and Trinoton-like genus in that family to which Menopon and Trinoton do not belong. The 

 only other Mallophagan species taken from the penguin genus Aptenodytes is Goniodes brevipes, 

 a small species very unlike this new form, described by Giebei (from .1 female speeimen) in the 

 Phil. Trans. Roy. Soc, Vol. 168, extra Vol. This speeimen also came from Kerguelen Id. 



The distinguishing characters of this genus are its Äfenopon-like form, the small sub- 

 orbicular head with sli"htlv-produced subreetangular temples, the distinetness of the meso- and 

 metathoracic segments in a degree unequalled elsewhere among the known Mallophaga unless it 

 be in Trinoton, the very small rharacteristically Philopterid antennae, the sharp division of each 

 eye into practicallv a pair of eyes, the large size of the hind body in comparison with the head, 

 the heavy transverse blotches of the abdomen and the five pairs of abdominal spiracles instead 

 of the usual six pairs." 



demerSUS Kellogg 1903. 

 Nesiotinus demersus Kellogg, Biological Bulletin, Vol. IV, 1903, Fig. 3. 



Kellogg, 1. c. : 



„Female. - - Body, length 5 mm, width 2,1 mm; head, length 0,75 m, width 1,15 mm; 

 thorax, length 1,25 mm, width of prothorax o,S mm, width of mesothorax 1,30 mm, width of 

 widest segment, the first, 2,1h mm; chestnut brown, with large 1 »lackish-brown blotches on thorax 

 and abdomen. 



Head, small in comparison with rest of body, hardly as wide as mesothorax, with flatly rounded 

 front, no orbital sinus, temples slightly swollen, rounded, but with postero-lateral angle slightly 

 obtusely produced, occipital margin slightly curving; eyes divided so as to give the effect of 

 one pair on each side; antennae short, slender, tapering; pustulated hairs on temporal margins 

 and two small hairs with large pustulation on dorsal surface of each temple, also four smaller 

 pustulations on postero-median dorsal surface, and one mesad from each eye pair; color chestnut- 

 brown with blackish eye flecks and dark brown marking along temporal margin and in postero- 

 mesial angles of each temporal region. 



Thorax of three distinet segments regularly widening posteriorly, the meta-segment being 

 nearly as wide as first (widest) abdominal segment and resembling an abdominal segment; prothorax 

 with slight median angulated point on anterior margin, with parallel straight lateral margins and 

 rounded anterodateral and postero-lateral angles, anterior half dark-brown, posterior half light-brown; 

 mesothorax with diverging lateral margins, small pustulated hairs in angles and flatly rounding posterior 

 margin: anterior four fifths of segment dark-brown with series of weak hairs in demi-pustulations 

 along the hind margin of this dark region; metathorax with diverging lateral margins, and with 

 large lateral transverse dark-brown blotches leaving a rather narrow light-brown median Space. 

 Legs with heavy short femora and long slender tibiae with few short, weakly pustulated spiny hairs 

 on each segment; two terminal tibial spines; femur darker than the translucent pale-brown tibiae. 



Abdomen forming with meso- and metathorax an ellipse; segments 1 and 2 widest and 

 others tapering slowly posteriorly; hairs few and inconspieuous ; segments 1 — 5 with conspieuous 

 spiracles each showing as a small brown spot in a large clear circular pustulation ; segments 



Deutsche Tiefsee-Expedition 1898 — 1899. Bd. III. -?I 



