364 Wisconsin Academy of Sciences, Arts and Letters. 
This is true also of three species in the Halle collection from 
Peoria, Ill., described by Dr. Giebel. 
We have omitted from the generic synonymy all reference to 
onr paper on Genera of Attidse since this was merely a collection 
of generic descriptions which are referred to under the dates of 
their first publication. 
The only purpose of the keys is to save time, and a species or 
genus that has been found by their use should always be identi¬ 
fied by the specific or generic description before it is accepted. 
A few of the drawings were made by Mr. Kapo Morito but 
most of them are by Mr. Emerton, who has also placed at our 
disposal the drawings made for his paper on Hew England At¬ 
tidse. We have made use of figures published in our earlier 
papers, especially fhose of 1888 which were made by Mr. Wil¬ 
liam M. Wheeler. Two figures have been reproduced from a 
paper by Mr. Banks and one has been copied from Mr. Cam¬ 
bridge. 
Leaving out of consideration the Lyssomanse (Attidse with 
eyes in four rows) we first divide the Attid genera of the United 
States into ant-like, and not ant-like spiders, and then subdivide 
each of these classes into Simon’s three groups of Pluridentati, 
Unident ati and Eissidentati, according to the dentition of the 
lower margin of the falx. This we do merely as a matter of 
practical convenience, the fact that it sometimes separates closely 
allied genera adding to its usefulness as a means of identifica¬ 
tion. 
