Marshall—Ten Species of Arrenuri. 
151 
These variations were in the structures already mentioned 
(Fig. 2, e and /). There fir ere several gradations in the size 
of the conical elevations in front, of the eyes, from small ones 
like those found in .4. globator scarcely projecting beyond the 
body edge, to the large horns of the more decided types of A. 
megalurus. There were likewise gradations between the flat- 
topped appendage with rounded and slightly indented end of 
the one type, and the strongly arched appendage with bowed- 
out. and more deeply indented end of the other. The flat-topped 
form predominated. Some individuals in dorsal view resemble 
A. globator most; in lateral view, the variety. There is a good 
deal of likeness here to A. tabulator Muller. In view, of these 
considerations, it seems best, to regard these Arrenuri as a va¬ 
riety of A. globator and connected with it by intermediate 
forms. 
The length of A. megalurus is 1.12 mm ; width, 0.6 nun; 
appendage, 0.45 mm. The color is dark brown-green with in¬ 
distinct darker markings. 
A. megalurus fern, is hardly to be distinguished from A. 
globator fern. 
Arrenurus manubriator, nov. spec. 
Fig. 3, ci—e. Pis. XV—XVII. 
Several individuals found in collections with A. globator have 
been erected into' this new species. The namei, referring to the 
resemblance of the appendage to a handle, has been suggested 
by Dr. Wolcott of the University of Nebraska. In dorsal as¬ 
pect these mites closely resemble A. globator but lack the little 
horns in front of the eyes ; and the appendage is nearly the 
same width throughout. Viewed laterally it is not so high nor 
its humps so pronounced; the dorsal shield is higher and the 
side walls of the body do not rise up so high. A. manubriator 
more nearly resembles the forms described as intermediate be¬ 
tween A. globator and A. megalurus. 
The form of the body, its epimera, dorsal shield and genital 
area resemble these structures in Piersig’s figures, for A. tubur 
lator. The appendage here, however, is a trifle wider at the 
