On some Mallophaga. 37 



his types was tVom a Zoological garden (Rotterdam) under con- 

 ditions which facilitate "straggling'' in a most confusing way. Re- 

 ceutly, after liaving g-iven up all liope of seeing grandis from T. pe- 

 lagica, we encountered it in such numbers as to snggest it was in 

 its natural habitat, upon Stercorarius parasüicus. A study of tliis 

 series enabled us to place some immature Lipeiirus which we had 

 in our collection from Stercorarius pomarinus, labelled provisionally 

 "■mutahilis?'' We have now no doubt that these are referable to 

 L. grandis P. and that the genus Stercorarius snpplies some of its 

 normal hosts. L. imäahilis and L. grandis though very distinct when 

 fully adult are practically inseparable at a younger stage. The 

 uarrow black lateral markings of the immature stages of either 

 insect might well suggest the name L. biUneatus. If the point has 

 no longer much importance it is interesting to note that a Lipeurtis, 

 occuring on Stercorarius has as its nearest allies forms got on Tubi- 

 narial hosts. L. niutabilis and L. grandis must phylogenetically be 

 extremely closely connected as the structure of head and genitalia 

 shows. 



Piaget's figure of muiahiUs is unexpectedly disappointing yet 

 we do not think that error is likely to arise through following his 

 description. Kellogg's iigures are excellent. 



We should add that Fulmarus glacialoides is given by Kellogg 

 as a host of L. grandis — the locality being Magellan straits, We 

 shall very giadly examine Lipeurus from any species of Fulmarus. 



The occurrence of Lipeurus grandis on Stercorarius is suggestive 

 for the systematist. Wlth grandis there will require now to be 

 compared L. laculatus Kellogg et Chapman (New Mallophaga, pt. 3, 

 p. 93, tab. 7, fig. 1, 1899) while Lipeurus modestus Giebel (Ins. 

 Epiz., p, 233, 1874) will also have to be considered. But this cannot 

 be attempted here. 



Lipeurus temporalis Nitzsch 1818. 

 L. temporalis NiTZSCH, in: Giebel, Ins. Epiz., p. 239 (1874), 



2 cJ(J, $, 5 imm. Branta bernicla, Gjanoyri, 6. 9. 1912. K. Schrei- 

 ber leg. 



The Goose and Duck Lipeuri are much in need of revision. 

 How many species we have it is hard to say and the problem is 

 probably complicated by ''straggling"'. Thus a •'bisetose" Lipeurus 

 from Domestic goose may be one of three distinct types. Even in 



