Oeohjy and Xatural His 



1 \ > 1)1 a.ka, to explore tho PI 1 

 \(r Ueie rich oolleotion^ < 



^ olU'iro. The more important -( lentiti^ it-iiil> ^Mll -^oon be pub- 

 lished. 



4 Moyiogrnph of the Xorth .lnor,<.n, [.f,n .>/„ ; by Dr. H. 

 V IK..EX. No Til of the IlhiMi.iti.lCaTalooiR of the Museum 

 •jf Conipai ati\ e Zobb)fry. Cinibrititre, 1 ^VO — Our American craw- 

 rtsh lia\e been much neglected, n"\er ha\ing be( n Mibjected to 



ii*' an ace urate' and \ er\ \a'u ible nionoirraph. The in\e-ti<j:ation 

 of the eonstancv of tlie '-ptcdh chai'u ter- and the m \ual pi i uhai- 

 ities are hisrhlC intoie-^ling and form the most nnjMMtant teatim 

 of tile '\^ork. In i%tmh<(r'n, vhuh imliidt^ all t'n -pn le- t i>t of 

 the Rocky Mts., the autlior has font.d th it the first ab b.nnn d legs 



1" some speeie!? of IchelnU imH fiddiosomn. In this same g(.nus 



two forms of males are described,— ordinary fnlly de\ eloped in- 



* This Journal, II, vol 1, p 292. Sept 1870 



