414 



lamella armed with 3 spines, the apical one very strong and denticulated in its 

 outer part. 



Colour not yet ascertained. 



Length of adult female 0.75 mm. 



Remarks. This form was first described by Th. Scott as a species of 

 the genus Tetragoniceps, but has recently been removed by the same author, to 

 constitute the type of a separate genus. In outward appearance it bears a 

 great resemblance to Phyllopodopsyllus Bradyi, and it is indeed to this resemblance 

 that the specific name proposed by Th. Scott refers. On a closer examination 

 it may, however, be at once distinguished by the prominent rostrum and the 

 narrow linear caudal rami. 



Occurrence. Some few specimens of this form were found in samples 

 taken last summer at Korshavn from a depth of about 30 fathoms, coarse 

 sandy bottom. 



Distribution. Scottish coast (Scott). 



Gen. EvanSia, Scott, 1906. 



Generic Characters. Body narrow and elongated, with comparatively thin 

 integuments. Rostrum well defined, though less prominent than in Pteropsyllus. 

 Caudal rami produced, tapered, with the apical seta distinctly geniculate. An- 

 terior antennae in female simple, without any armature, in male strongly hinged. 

 Posterior antennae with the outer ramus small, uniarticulate. Mandibular palp 

 simple, biarticulate. Maxillae with the exopodal and epipodal lobes obsolete. 

 Anterior maxillipeds short and stout, with only 2 setiferous lobes inside the basal 

 joint. 1st pair of legs slender, with the inner ramus much longer than the 

 outer and biarticulate. Inner ramus of the 3 succeeding pairs of legs very small, 

 uniarticulate; that of 3rd pair in male transformed. Last pair of legs small, 

 uniarticulate. 



Remarks. This genus was established by Th. Scott, to include the form 

 previously described by him as Tetragoniceps incerta. Another species T. pyg- 

 mcea is also referred by Th. Scott to this genus. The chief differences from 

 the 3 preceding genera are the unarmed condition of the female anterior antennae, 

 the simple biarticulate mandibular palp, and the very small uniarticulate inner 

 rami of the 2nd to 4th pairs of legs. Only one of the 2 species is known 

 to me. 



