5S C Z APPENDIX. 



No. III. 



ARTICULATA. 



Catalogue of Arachnida and Lisects, collected by Mr. 

 King) Surgeon and Naturalist to the Expedition. By 

 J. G. Children, F.R.SS. London and Edinburgh. 

 F.L.S. &c. 



The climate and the peculiar circumstances of the 

 expedition necessarily limit the insects collected during 

 Captain Back's journey, to a very small number. The 

 most abundant belong to Latreille's third Order of the 

 class, Parasita (Anoplura, Leach), many of the 

 individuals of which, being the companions and conse- 

 quence of poverty and filth, are regarded in general 

 rather as objects of disgust than of attraction. From 

 this cause, and perhaps, too, from their minuteness, 

 these insects have hitherto excited less attention amongst 

 naturalists than their singular, and I may say beautiful, 

 forms and structure deserve ; although Redi, so long 

 ago as 1688, wrote on the subject, and published no 

 less than forty figures, such as they are, (including five 

 Acari,) of Pediculi and Pulices, infesting mammalia and 

 birds.* Since his time, they have been more or less 

 observed by Linnaeus, GeofTroy, Degeer, Scopoli, 

 Schranke, Latreille, and others, and more especially by 

 Leach and Nitzsch ; to the last of whom we are chiefly 

 indebted for a general and pretty complete systematic 



* Esperienze intorno alia Generazione degl' Insetti. 



