Amphipod from Kein Gardens. 133 



TorrestriQl species of Anipliipoda belongiiif^ to the familv 

 TalitridfB are known from various parts of the world, and 

 liave been found in hothouses in Europe, but not hitherto, so 

 far as I know, in this country. 



Since the reference of the species to tlie genus Talitrus 

 depends upon the characters of the males, it may be worth 

 while to note that the sex of these was definitely ascertained 

 by observation of the genital pajiilJae on the last thoracic 

 somite. 



Tah'trus hortulanus, sp. n. 



Adult male. — Total length 8 mm. 



Length of head along dorsal edge less than that of first two 

 free somites together. First co.val plate rather broadly 

 rounded below; fifth more than half as long again as fourth, 

 its anterior lobe truncated below. First three abdominal 

 pleural plates with posterior corners pointed and slightly 

 produced, J^i/es round, of moderate size. 



Antenmdes extending well beyond middle of last segment 

 of antennal peduncle ; tirst three segments increasing succes- 

 sively in length ; fiagellum of seven or eight segments besides 

 a minute terminal one. 



Antennce: peduncle equal or nearly so to the length of 

 head and first two free somites together ; flagellum half as 

 long again, 



MaxUlipeds : outer plates with distal edge directed obliquely 

 inwards and broadly rounded (not bluntly pointed as in 

 2\ sylvatlcus) ; palp with a minute fourth segment, obscurely 

 defined. 



First gnatho pods ', carpus about 2^ times as long as wide 

 and ^ longer than propodus ; propodus more than three times 

 as long as wide, hardly narrowed distally, 2^ times as long 

 as dactylus. 



Second gnathopods very long and slender ; basis distinctly 

 shorter than three following segments together ; merus with 

 lower margin evenly rounded, without projecting lobe or area 

 of shagreened cuticle ; carpus nearly twice as long as merus, 

 five times as long as its width in the middle, with a small 

 shagreened lobe close to distal end of lower edge; propodus 

 a little longer than carpus, about five times as long as wide, 

 with articulation of dactylus at about one-Hfth of its length 

 from distal end. 



PercEopods of tirst and second pairs subequal in length ; 

 third pair a little longer than second, basis ovate, with hind 

 margin gently convex ; fifth pair longer than fourth, basis 



