ON PSEUDO-SCOr.PIONES. 15 



called CheUfer cancroides, -wliicli appears to be a kind of " stock" 

 name for any Chelifer. One is figured in Hooke's Micrograpliia 

 (pi. xxiii., fig. 2), in Albin's Sjdders (pi. xxxvi., fig. 181), in 

 Sliaw's Miscellany, and in Donovan's British Insects (pi. 215). 

 The best figure of Chelifer cancroides is in the old German work of 

 Roesel, who regarded it as a scorpion. The learned De Geer in- 

 stituted the genus Chelifer, but it was left for our own countryman, 

 Leach, to point out the distinction in the eyes and to separate the 

 creatures into two genera, under the names of Chelifer awl Obisium. 

 In his '' Miscellany" Leach figures and describes eight species as 

 British^ which, with the typical Chelifer cancroides, are ail that we 

 yet know as inhabiting these islands, for nothing has been added 

 since Dr. Leach's time, so there is a good field for investigation, 

 and we hope that Mr. Mclntire will follow it. For the benefit of 

 those Avho may be desirous of making Chelifers their study, I may 

 add that they will find the necessary information in Walckenaer's 

 Apteres (vols. iii. and iv.), Koch's Crustaceen and Myriapodeen 

 (with figures), Hahn and Koch's " Die Arachniden" (vol. x.), and 

 the 27th volume of the first series of the Annales des Sciences 

 Naturelles. The majority of species will be found figured in these 

 works. It cannot be too often impressed upou young microscopists 

 how essential it is that objects should be correctly and fully named. 

 The leg of a spider, the wing case of a beetle, or the tongue of a 

 fly, should not find a place in any sane person's cabinet, unless 

 what spider, what beetle, or what fly has been first ascertained. 



