272 



[November, 

 mature examnle arp H;«t,-n.fi ^ , '^ "^ JVir. Oollin ; the legs too in the more 



orange .talk.. ""' "'''"''■ ""'' "«' '"«'"' '-"»- -PPO«e<I „„ 



inJeT"^!' T "'' *' '""' '"^^'"'^ ™™ "- °- I'oi"' of 

 loZttJ rT'"''" '""> P'-'n>e^'^- there i, a marked 



contr et„,Bn tbe oolouriug of the se.e. „. the thorax aud abdo 



r ' ii t!:; "'^ r°' "-'^^ "■»- '^^ -^'«'-'' "«- — „ted 



de bZk eo " t ■;"''"'"' '"' ''"" '^^ ^^"» -« of tl'e same 

 deep black colour. Further, the bristle or bristles o. the first ioint of 



«: t rhT::eTfr:^" '\"' "" *'''"^^'"'''-- p-"«c^^^ 



baud the, »'«'tenhefouudedthegeuus. Ou the other 



baud the more .mportaut characters remain, vi.., the elongated form 

 of the th,rd jo,at of the auteun^e, tbe absence of spines 1 the sub 



Tarrington : October, 1903. 



IHEIE HOSTS. 



BY EDWARD SAUNDERS, F.R.S., &c 



The very interesting paper on re,pa aiutriaea and V. ruf. by 

 Mssr» Carpenter and Pa.k-Beresford „, our last two .nmhe^ has 

 induced mo to offer some remarks on the subiect of i, r 

 cnckoo parasitism general,,, not as a critr^r^Lrc HuT 

 but as a record of various points which I have noticed "'"'"™'' 



It seems clear from tbe account given b, the above authors that 

 at any rate the two forms under consideration are .peciflcally It Le 

 according to our ordinary views of what makes a species as TT 

 the colour differences, they are structurally distinr %,"::': 

 w ch ,s more t an can be said of many species which arc considered 

 valid by entomologists ; at the same time they are more closelv all Id 

 each other than any other in,uilines and /osts that are aT pre" ut 

 known A cnr.ons point which I have noticed is that as we ascend n 

 he sea e we find as a rule the hosts and their inquilines mo e b " 

 each other, and ,n the social species this similarity ,s the most Zkd 



