MOUTH-PARTS OF THE MALLOPHAGA. 



Distribution of the Sderite and ^'■Glands." 



133 



A revised list of the distribution of the sclerite and '• glands " 

 in the Mallophaga must now stand : — 



All the species examined of Nirnvus, Menopon, Lipeurus, and 

 Dochophorus in the collection of the British Museum possess 

 sclerite and glands. Snodgrass records them as absent from 

 N. signatits, L. picturatu,s, and L. longipilus, D. icterodes, and the 

 following species of Menopon : — distinctuni, malleus, persignatum, 

 prceeursor, redictdosum, robustum, titan, and tride7is. The sclerite 

 and glands are certainly present in titan and in tridens, though 

 they are considerably modified and requiie careful dissection. 

 They are described below. From a summary inspection of 

 Docliophorus sphenophoriis N. the structures appeai'ed to be absent, 

 but here again on dissection I found them present in a modified 

 form (text-fig. 27, p. 135). 



Descriptions of Special Cases. 



Ancistrona proceUarice Westwood (fi-om Procellaria cajjensis). — 

 The hypopharynx was incorrectly described and figured by 

 Westwood (1874) (8) as a rod bifurcating in front. The lateral 

 pieces (text-fig. 26, D) were omitted. In all probability the 



* The typical sclerite and glands where they occur are plainly visible through 

 the integument, and, according to figures of these two genera, are present in them. 

 When modified, the sclerite and glands cannot be discorered without dissection, 

 and this, perhaps, accounts for the third column being so long in the list given by 

 Snodgrass. 



t Gen. nov. about to be described in the Bulletin for Entomological Research. 



