PAPERS ON ZOOLOGY ~~ + 179 
GENUS AGRIOLIMAX Morch, 1868 
110. A. campestris (Binney)—White Heath, Monticello, 
Brownfield and Cottonwood Woods, Urbana, St. Joseph, 
Homer, Homer Park, Muncie, Oakwood, Hillery and Danville. 
Another of our very abundant mollusks. It is found every- 
where, in forest and open, on streets and walks, under debris 
of all kinds, under logs, bark, stones, leaves, etc., preferring 
cool, moist habitats as a rule, and associating with nearly all 
the terrestrial molluks, in particular with the Zonitide. In 
hydrophytic associations it is found with Lymneidz and 
Physid, sometimes in places that are extremely wet. 
The average duration of the egg stage, as determined in the 
laboratory, was 13 days 7 hours. The eggs are spherical, 1.5 
mm. to 2-5 mm. in diameter. Sometimes unusually large and 
elliptical eggs occur among them. The young slugs measure 3 
mm. upon hatching. 
Family Philomycide 
GENUS PHILOMYCUS (Rafinesque, 1820) Ferussac 
111. P. carolinensis (Bose)—White Heath, Piatt Co., Brown- 
field Woods, Cottonwood Woods, Urbana, St. Joseph, Homer, 
Homer Park, Champaign Co., Muncie, Oakwood, Hillery and 
Danville, Vermilion Co. This is the commonest slug occurring 
under bark. It frequents “starting” bark of fallen or standing 
dead trees, sometimes in the interior of decayed trunks. With 
Pyramidula alternata it is the first invader under bark, thus 
favoring rapid disintegration of the wood. This slug is more 
or less solitary, but under the bark of a large log as many as a 
dozen specimens will be found scattered about. 
The eggs resemble drops of whitish gelantine with their 
centers much whiter. They measure 4 mm. by 3.2 mm. When 
deposited they are practically spherical, but within a few hours 
they change to elliptical. The egg stage is approximately 
seventeen days. 
This slug has frequently been found completely covered with 
the excrement of the larve of Scoleocampa liburna, a lepidop- 
ter that riddles dead, soft wood. In such cases the bark still 
covers the log, although it is completely loosened. This slug 
lives among certain ants (Camponotus heruculaneus L.), 
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