GG 
MEMOIR OF RE GEER. 
Aptera. 
Saltatoria. 
Gressoria. - 
11. Suctoria, ( Pulex .) 
'1*2. Aucenata,(Z)epzs7«a, Podura, 
Pcdiculiiif , &c.) 
13. Atrachelia, ( Spiders and 
Crabs.) 
1 4. Crustacea, ( Isopoda , Myrio - 
k poda.) 
This arrangement, which has been explained in a 
separate work by Retzius,* is, in several respects, 
inferior to that of Linnaeus, the improved editions of 
whose Systema Naturce had previously appeared. 
Yet in one particular it was an improvement, namely 
by the insulation of the Orthoptera, which Linnaeus 
had confounded with the Hemiptern. The parts of the 
mouth are taken into consideration in De Geer’s sys- 
tem, and in this respect it may be said to be inter- 
mediate between that of Linnceus and Fabricius. In 
many instances it must be allowed to be highly natural 
and worthy of emanating from such a distinguished 
entomologist, and there can be little doubt that it 
would have enjoyed more consideration than has fallen 
to its lot, if every thing of this nature, at the time 
when it appeared, had not been eclipsed by the cul- 
minating star of Linnaeus. 
* Car. lib. Bar. de Geer genera et >pecies Insectorum , Sfc. 8ro. 
Lipsite , 1783. 
