from the Eastern Archipelago. 20,1 



Shallow-sea Jleep-sea 



Islands. Islands. Common. 



Mecopus 2 2 2 



Agametis 1 1 1 



Chirozetes 3 1 



Pempheres 1 



Dtedania 1 



Phylaitis 1 1 ' 



Heurippa 1 



Metialma 1 3 



Osphilia 1 2 



Nauphaeus 1 



Arachnopu8 5 3 2 



Thyestetha 1 



Telaugia 1 



Idotasia 2 1 2 



Semiathe 2 



Xychusa 1 



Elicliora 1 



Nyphseba 1 



• 21 17 8 



I do not attach much importance to these tables, or to any of 

 the same character which may be drawn up on the strength of 

 our present materials ; but it would not be difficult to show 

 that similar differences would be found to a greater or less 

 extent in other cases. How very few species, for instance, are 

 as yet known to be common to Dorey and Aru ! and yet their 

 faunas are probably almost identical. 



Of the Australian Zygopinse only two species have been 

 described, Ilacuris laticollis and Mecojms tipularius. Another 

 Mecojms and two Idotasice are in my collection; and these, as far 

 as I know, are all that have at present been found in Australia — 

 as when there are genera common to Malasia and Australia, 

 they are frequently found in regions beyond the two : Mecopus 

 and Idotasia have representatives in the Fiji Islands and New 

 Caledonia respectively. 



As to the habits of the species, Mr. Wallace tells me that the 

 Mecopi are always found on dead trees in the forest, love the 

 sunshine, and take flight rapidly. The members of the allied 

 genera appear to have similar habits ; but with the Arachno- 

 podes it is different ; they look like spiders and have the motion 

 of spiders, frequent the edges of leaves, moving rapidly beneath 

 when approached. Idotasim and their allies are also found on 

 leaves, but are sluggish. The species observed by Lacordaire 

 in Cayenne and Brazil " live exclusively on the trunks of trees, 

 and are usually quiescent. At the approach of danger, tliey 

 run rapidly round the tree ; and when one attempts to seize 

 them, they fall suddenly as though dead. But instead of 



