Mr. T. V. Wollastoii on a new fjemis of British Curculionidse. 129 



Museum, but Dr. Baird thinks that the rostrum is not furcate 

 like that of Cetochilus. Prof. Dana has no doubt that they are 

 similar in this respect, but separates them because the eyes are 

 in Calanus close together, in Cetochilus at opposite sides of the 

 head. If Dr. Baird is right, then the above-described species 

 will be Cetochili ; or if they differ as to the eyes, will form a new 

 genus. Till these points are decided, it will be convenient to 

 consider them to be Calani. Dr. Baird referred C. arcticus to 

 Cetochilus on account of its forked rostrum. 



EXPLANATION OF PLATE V. 



Fig. I, Fifth pair of natatory legs of Calanus magnus. 



-^ 2. First ditto C. horealis. 



— 3. Fifth ditto C. horealis. 



— 4. First ditto C. plumosus. 



— 5. Fifth ditto C. plumosus. 



— 6. First ditto C. magnus. 



— 7. Fifth ditto of the male of C. elegans. 



— 8. Fourth ditto of the female of C. elegans. 



— 9. Third pair of maxillipeds of C. elegans. 

 -^10. Posterior legs of C. longus. 



— n. Abdomen and posterior part of the cephalothorax of 



ji ; ;.-}i^ ' Cmagnus. .^. ,,., . _ ., . ..^. . . , _^ 



.fiflo m\\ fix 8r?omrj.?(nif; ^%ov ei Mid ,<i3J3'3qa t^dj fbi a'^ J/r>->'stl ^i 



y JTOfti^'^" ^"- i ' ' • — — T— — : : -^- r- r- 



X^IV. — Description of a new Genus and Species of British Cur- 

 culionidse. By T. Vernon WoLLASTON, M.A., F.L.S. 



ffsrfw JMh , Genus Pentarthrum, Woll. .'tis "i^ OJ 



'fO i\^n\ <y'i\, i ^ , 4 : I >. .tf.vT 



Corpus angusto-cylindricum, sculpturatum, Cossoni formam 

 simulans, sed ab illo certe distinctum : capite subporrecto ; rostra 

 prothorace parum breviore, parallelo, tereti, sat gracili, subrecto ; 

 scrohe parum profunda, decurva, usque ad oculorum marginem 

 inferiorem retrorsum ducta ; oculis parvis, rotundatis, lateralibus, 

 leviter prominulis : prothorace elongato, subconico, mox pone ^ 

 apicem subito transversim constricto, necnon ad basin ipsam 

 marginato : scutello minuto, subrotundato : elytris parallelis, ad 

 apicem ipsum leviter acuminatis et singulatim subrotundatis. 

 Antenna breves, robustse, versus medium rostri (in utroque sexu, 

 nisi fallor) insertse ; scapo subrecto (vix incurvo), leviter clavato ; 

 funiculo 5-articulato, articulis latitudine vix crescentibus, l"^** et 

 2^^° sub-obconicis, 3°, 4*° et 5*° paulo brevioribus, transverso- 

 obconicis; capitulo rotundato-ovato, solidissimo (articulis segre 

 observandis), piloso, necnon ad apicem spongioso. Pedes bre- 

 viusculi, robusti, ad basin valde (prsesertim posteriores) distantes : 

 femoribus clavatis, muticis : tibiis rectis, ad apicem externum in 

 uncum magnum robustum acutum inflexum productis : tarsis 



Ann. <Sf Mag. N. Hist. Ser. 2. Vol. xiv. 9 



