von | © PROCEEDINGS OF THE NATIONAL MUSEUM. 625 
ing from 6 inches to 1 foot of water. At the mouth of these burrows 
were mud chimneys 5 inches high. The soil was blue clay mixed with 
sand and gravel. At least three species build chimneys, viz: C. diog- 
enes, C. argillicola, and C. dubius. 
The specimen from Kelley’s Island, Lake Erie, Ohio, inadvertently 
referred to C. diogenes in my Revision, p. 71, is C. argillicola. I have 
not yet seen C. diogenes from the State of Ohio. 
Cambarus setosus Fax. 
Cambarus setosus Faxon, Bull. Mus. Comp. Zoéol., xvi, No. 6, 1889, p. 237, pl. 1, 
figs. 1, 2,3, 7, pl. u, fig. 1. 
Rostrum rather short, triangular, slightly concave above, terminat- 
ing in a short, upturned horny tip; sides convex, raised into sharp 
crests ; no lateral teeth except in small specimens which show a rudi- 
mentary spiny tooth on each side of the base of the acumen; margins 
setiferous. Post-orbital ridges obsolescent, destitute of spines. Cara- 
pace subcylindrical, flattened above, the region behind the cervical 
groove very long; smooth and punctate above, granulate on the 
hepatic and branchial areas; @ small spine on the antero-lateral bor- 
der, a little way above the anterior end of the cervical groove. Areola 
very narrow, sides subparallel for some distance. Abdomen longer 
than the cephalothorax, sparsely setose; pleura rounded; telson of 
moderate length, proximal segment bispinose (occasionally trispinose) 
on each side. Anterior process of the epistoma broadly transverse, 
anterior border notched or dentate. Sternum tuberculate between the 
first to third pairs of legs. Eyes and eye-stalks rudimentary, but not 
wholly covered by the rostrum. Basal segment of the antennule fur- 
nished with a sharp spine below, near the distal end. Antenne as 
long as, or longer than, the body; antennal scale surpassing the rostrum, 
very broad, the broadest part near the distalend ; outer margin setose, 
convex, inflated, ending in a sharp but not very long spine. Third 
maxillipeds hirsute. Chelipeds of moderate length; chela long, setose, 
inner and outer margins of the hand provided with blunt tubercles 
irregularly disposed in a double row; fingers, long, incurved, opposed 
edges straight, bluntly toothed near the base, finely pectinate throughout 
their length, tips curved, corneous and acute. Carpus armed with a 
prominent internal median and inferior median spine; in addition to 
these there are in older specimens a variable number of small spines on 
the inner, lower, and outer faces. Upper margin of the meros spinu- 
lose, lower face with the usual biserial arrangement of spines. 
In the male the third pair of legs is hooked on the third segment. 
The first abdominal appendages are similar to those of C. bartonii, end- 
ing in two recurved hooks, the outer of which is corneous and acute in 
in form I, the inner long, slender, and membranaceous. In form II 
both hooks are membranaceous, short, blunt, and not so widely sepa- 
rated as in form I. 
Proc. N. M. 89-——40 
