108 On North American Spiders. 
Epistemum, (Mihi.) 
Eyes 8, somewhat unequal ‘in size, ° ° 3 legs 1.4.3.2, or 
en co 
1. 4. 2. 3; lingua short, triangular; maxille somewhat pointed above, 
and alittle inclined over the lingua; mandibule nearly horizontal, 
slender, as long as the cephalothorax, tooth as long. =T wo species. 
These might be left with Arrus, to which they are closely related, 
but as that genus is large, it needs divisions, and the mandibule of 
these offer a peculiar and striking character, I have concluded to 
make the first of the two following species the type of a new genus 
Epretemum faustum obscure, cephalothorax edged with white, with 
two spots on the disk also white ; abdomen edged at base, and with 
four short bands, white. E. Palmarwm, deep ferruginous, with two 
bands on the cephalothorax and the abdomen, white; second, third 
and fourth pair of legs whitish. 
Beside these, I have three species of Arrvs, all very small, which 
have the habitus of Formica; so much like ants in many respects, 
that for a long time, I neglected to collect them on that accoutl. 
Their body is elongated, slender, nodose; and their legs also are 
slender, either 4. 3. 1. 2. or 4. 1. 2. 3. The cephalothorax in one, 
and the abdomen in all, are contracted in the middle, so as to give 
them the appearance of being divided in three or four joints. 4H 
other characters, coincide generally with Arrus. ‘They are found on 
plants. Should it be thought convenient, those and any other new 
species with those characters, might be collected under the generic 
name of SyNEMosYNA. : 
* * % % * 
It will be observed, that, in the above arrangement, I have departed 
from that of Latreille in no essential point, but justice requires us to 
notice, that after the labors of the greatest living entomologist, the 
method of Walckenaer, may still be considered as somewhat more 
natural than that of Latreille. I have given a sufficient account of the 
American genera, known to me, to allow any person whose taste m4y 
lead him to study this branch, to pursue the subject to a certain es 
tent, and to assist in bringing my Monographia to a less imperfect 
state, than that in which it now is. It is evident to me that if I ® 
Correspondents in the various states of this Union, who would be 
ling to send me specimens, I could double my collection in # few 
years. Some persons have been kind enough to send me seve 
interesting species, particularly Dr. Harris of Milton, and Dr. C. 
