118 American Midland Naturalist Monograph No. 1 



Genus Antricola Cooley and Kohls, 1942 



Dorsal walls flattened and marginated; below the flattened dorsum the 

 'body convex and deep. Integument semi-translucent and the surface smooth, 

 shining, and with tubercles. Discs absent on the venter. Mouth parts adapted 

 for quick feeding and not for clinging to the host; hypostome convex ventral- 

 ly, concave dorsally and lacking effective denticles; chelicerae large and effec- 

 tive. Anal ring large. Eyes absent. Eggs small and the small larvae with 

 bulbous pulvillae in place of claws. 



Genotype: Ormthodoros coprophtlus Mcintosh, 1935. 



Key to Species of Antricola 



1. Margin of body of adults and nymphs wiith finger-like projections, each having 



several hairs marginatus (p. 123) 



2. Margin of body of adults and nymphs lacking projections coprophilus (p. 1 18) 



Antricola coprophilus (Mcintosh), 1°35 



Plate 13, Figs. 53, 54, and 55 



1935. Orniihodoros coprophilus Mcintosh, original description, pp. 519-522, with 

 figures. 



Sexes dissimilar; adults and nymphs similar. 



FEMALE 6 



Body. — Length about 6.0; greatest width about 3.3. Color light tan. Shape 

 in dorsal view approching pyriform, tapering to a point in front which is bent 

 ventrad; with two mild, marginal projections above the spiracles and two 

 submarginal elevations above legs II, visible from above. Lateral margins 

 mildly excavated back of leg IV. The marginated dorsal surface, while flat- 

 tened in general, is irregular and has deep, broad submarginal furrows which 

 unite in front. Also with deep, short, marginal furrows in the postero-lateral 

 areas near the excavations. 



Tubercles. — Tubercles large, moderate in number, of various shapes and 

 sizes, those in the median area approaching a hemisphere, those on the margins 

 fused and directed outward at an angle; absent in the furrows except for a few 

 in the marginal furrows. Many of the tubercles with one to three hairs on 

 their curved tops; such hairs longpr in the median area. Tubercles absent on 

 the lateral walls above the legs but present back of the legs, on the ventral 

 surface, and in the inter-coxal area where they are smaller and less definite. 



Discs. — Discs present in a continuous series in the deep, dorsal furrows; 

 absent on the venter. 



Coxae. — All coxae contiguous, smooth, shining, and with a few hairs. 



6 In this species the depleted adults are usually much shrunken and misshapen. Males 

 are less misshapen than the females. Specimens for describing were selected out of many 

 for being what we may call "normal.' 



