94 Capt. F. W. Hutton on the OeograpMcal 



Heteroptera were not in existence. The same thing is seen 

 in the difference between the moths and the butterflies, sug- 

 gesting also that the latter were developed at a later period than 

 the former; and there can be no doubt that -when our insects 

 are better known a careful comparison of them with similar 

 faunas of other countries will afford a most instructive lesson. 

 With the exception of the Indian [Blatta orientalis) and 

 American [B. americanci) cockroaches, neither of which are 

 common, the flea {Piilex trrttans), the bed-bug {Cimex lectu- 

 laritis), several Aphides, the slugworm {Tenthredo cerasi), 

 and the house-fly {Musca domestica)^ I am riot aware of any 

 insect that has been introduced unintentionally by man 

 during the progress of colonization ; for the ring-legged 

 mosquito, which is supposed in Auckland to have been intro- 

 duced by the troops from India, belongs to a species [Cidex 

 argyropus) not found elsewhere, and was sent home by Dr. 

 Sinclair before the troops arrived. The only exceptions may 

 perhaps be : — the black field-cricket, which, although inhabit- 

 ing fields with us, and but rarely entering houses, appears to be 

 identical with the house-cricket of Europe {Acheta domestica) 

 and to have spread quite lately ; and also a small dark-brown 

 beetle belonging to the genus Elater^ which is abundant in 

 Auckland, but, to the best of my knowledge, is not found 

 more than twenty miles out of that town. 



Mtriopoda. 



Of Centipedes nine or ten species are now known, all of 

 which are endemic. The genus Lithohius extends from North 

 America, Europe, and North Africa to Singapore, but is not 

 found in Australia ; Henicops is found only in Chili and Tas- 

 mania, Cryptops only in North America and England ; while 

 Cermatia and CormocepTicdus have wider ranges and are both 

 found in Australia. 



Arachnida. 



Of Spiders we have about 100 species ; but my knowledge 

 of them is very limited. Mr. Pickard Cambridge, in a letter 

 to me, remarks, " all the spiders you now send [from the 

 Auckland province], except one or two, are strikingly Euro- 

 pean in appearance, nothing tropical-looking among them." 

 Perhaps the most remarkable fact is the occurrence in the 

 Chatham Islands of a species of water-spider {Argyroneta) j of 

 which only one other species, inhabiting Europe, is known. 

 Spiders are very numerous in New Zealand, owing no doubt 

 to the abundance of DijJtera, on which order they chiefly prey. 



Crustacea. 

 Of Crustaceans 106 species have been described as coming 



