1954] 
Cook — Hydracarina of Michigan 
149 
water. This species has also been taken in bogs and per- 
manent ponds. 
Range : Known only from Wisconsin and Michigan. Lim- 
nesia marshallae has been collected in eight Michigan 
counties, but as in Limnesia anomala, these are widely 
scattered and it probably is statewide in occurance. 
Remarks : Limnesia marshallae was originally described 
from a drawing by Ruth Marshall of the genital field of 
the male. Marshall (1932) included drawings of the ven- 
tral view of a female, genital field of a male and provisional 
genital field of a nymph, all labeled Limnesiopsis anomala. 
Viets (1938) recognized that the male was distinct and 
set it up as the variety Limnesiopsis anomala marshallae. 
Since none of the subgeneric characters were illustrated, 
Viets could not know that it was really a Limnesiella in- 
stead of a Limnesiopsis. Lundblad (1941) described a fe- 
male from Wisconsin as Limnesia (Limnesiella) hutchin- 
soni. The present author sent a female specimen of Lim- 
nesia marshallae (Viets) to Lundblad and he found it to 
be identical with his L. hutchinsoni. The latter name there- 
fore becomes a synonym. In the same paper Lundblad also 
described a new species of Limnesia s.s. under the name of 
Limnesia marshallae. This name is therefore a homonym 
and Lundblad (1952) has renamed the species L. marshal- 
liana. One of the male specimens of L. marshallae (Viets) 
from Marshall’s collection, now in the Chicago Natural 
History Museum, should be designated as lectotype. 
Limnesia (Limnesiella) eggletoni n. sp. 
Figs. 4, 5, 9, 10, 11 
Male: Length of body 0.88-1.08 mm; length of genital 
field 0.25-0.28 mm; width of genital field 0.26-0.31 mm. 
Body rounded, integument soft; sclerites absent from 
posterior end of dorsum; acetabular plates united, outer 
margin convex; 14-18 genital acetabula present on each 
side, these grouped into anterior and posterior sets with 
a wide area free of acetabula between ; posterior acetabular 
group arranged in the form of a hook about the large 
acetabula; apodemes of posterior border of third coxae 
complete; setigerous gland of fourth coxae located about 
