1930 ] 
American Species of Ozyptila 
375 
A REVISION OF THE AMERICAN SPECIES 
OF THE GENUS OZYPTILA 
By Elizabeth B. Bryant 
Museum of Comparative Zoology, Cambridge, Mass. 
The genus Ozyptila was made by Simon in 1864 for 
the single species Thomisus claveatus Walckenaer (Ins. 
Apt.; 1837, 1, p. 510, Aug., 1833, Pyrenees), and wrongly 
identified as Thomisus hirtus Savigny, 1837, from Egypt. 
O. claveata of Walckenaer has not been recognized and in 
1875 (Arach. France, 2, p. 211), Simon renamed the species 
that has been called claveata by Blackwell and others 
0. hlackwalli, and selected Thomisus hrevipedes Hahn as 
type of the genus. 
The genus has a wide distribution in Europe with many 
species. In America all the species were known first 
from females, wth the exception of O. marshalli Barrows. 
Recently in revising the material at the Museum of Com- 
parative Zoology the males have been identified and two 
new species were found. The males are easily distinguished 
by the palpi and the females by the epigynes. The clavate 
bristles may have specific value, but they are easily broken 
and the scar is difficult to see, so that they are found to be 
unsatisfactory. The number and position of the spines on 
the anterior legs is apparently constant throughout the 
genus, with the possible exception of 0. nevadensis Keyser- 
ling, which is known only from the description. This is 
supposed to have two lateral spines on the first metatarsi 
instead of one. The color markings are also disappointing. 
The genus is not well represented in collections, as the 
spiders are small, of a dull brown color with indistinct 
marks and as they live on the ground they are easily over- 
looked. Nine species have been recognized, known by 
both sexes, with the exception of 0 . neglecta and 0 . mar- 
shall i, which are represented only by the males. 0 . mar- 
