TWO NEW GENERA OF MALLOPHAGA. 87 



CC Forehead without strong lateral swellings. 



D Antennre projecting beyond border of the head ; temporal angles 



projecting rectangularly ; eye large and simple Boopia Piaget. 



DD Antenna; concealed in groove on under side of the head ; tem- 

 poral angles rounded or slightly angular ; eye divided by an 

 emargination and fleck. 

 E Mesothorax separated from metathorax by a suture. 



Trim ton Nitzsch. 

 EE Meso- and metathorax fused ; no suture. 



Lamobothrium Nitzsch. 

 BB Ocular emargination absent or very slight. 



C Sides of the head straight or slightly concave, with two small projecting 



labral lobes Physostonmm Nitzsch. 



CC Sides of the head sinuous ; forehead without labral lobes. 



D Ocular emargination filled by a strong swelling ; sternal markings 

 forming a quadrilateral without median blotches.. Nitzschia Denny. 

 DD Ocular emargination without swelling, hardly apparent or en- 

 tirely lacking ; median blotches on sternum. 



E Very large ; with two 2-pointed appendages on ventral aspect 

 of hind head ; anterior coxae with very long lobe-like appen- 

 dages Antisiroiia West wood. 



EE Small or medium ; without bipartite appendages of hind 

 head Alenopon N itzsch. 



PHILOCEANUS gen. nov. 



In a collection of Mallophaga taken by Mr. Rollo Beck from 

 birds of the Galapagos Islands (the collecting of birds and para- 

 sites was done by Mr. Beck in the summer of 1901), are five 

 specimens, including one male, three females, and one young, from 

 a single specimen of Pi'occllaria tethys (Wenman Id.) of a Mallo- 

 phagan species not assignable to any of the known genera. The 

 shape and habitus of whole body and the secondary structural 

 differences between the sexes, shown in antennae and abdominal 

 segments, are those of Lipeurus, while the well-developed and 

 unusual transversal membranous clypeal flap is that of Giebtlia. 

 The curious prolongation of the postero-lateral angles of the 

 mesothorax is a character peculiar to the new genus. As 

 Gicbelia with its short, broad body and antennae similar in both 

 sexes stands to Docophorus, so the new genus, which may be 

 called Philoceanus, with its elongate body, and differing antennae, 

 stands to Lipcurns. 



The characteristics of the new genus may be given as follows : 

 body Lipeuroid, elongate ; head, thorax and abdomen of about 



