998 I. M. Haw try 
may be collected at night, by the light of a lantern; cabbage leaves, shingles, 
or straw may be used as traps, from which the slugs may be collected 
in the morning and destroyed. All crop remnants and rubbish should 
be carefully removed from infested areas in the fall and destroyed, and 
salt or lime should be scattered around the edges of the infested fields or 
gardens. Manure should not be placed on infested fields or gardens in 
the fall. 
HOW TO DISTINGUISH THE VARIOUS SPECIES OF SLUGS FOUND IN BEAN 
FIELDS 
There are three slugs that the writer has frequently found associated 
with Agriolimax agrestis. They are Agriolimax campestris Binney, a 
native species, and Limax maximus L. and Arion circumscriptus Johnson,’ 
imported species. The following key may help in distinguishing the four 
species. 
A. Body blunt or rounded at posterior end; respiratory opening in anterior half of mantle; 
back not keeled in mature forms; color gray, with a black lateral band the entire 
lengthcoMbody, length s0kmmiss 9) el eke ean See Arion circumscriptus 
B. Body pointed at posterior end; respiratory opening in posterior half of mantle; back 
with at least a small keel at posterior end; color varied, but without the single lateral 
stripe. 
a. Slug large (100-200 mm.) ; spotted or with longitudinal bands of black .Limax maximus 
b. Slug smaller (25-50 mm.); color uniform or mottled. 
aa. Ground color usually whitish or ocherous, mottled or speckled with brown or 
black; mantle pore with unpigmented border; tubercles flattened; slime 
milky; length when full-grown, 50 mm......... Agriolimax agrestis 
bb. Color uniformly amber or black; mantle pore of same color as remainder of 
mantle; lleerelis not flattened: slime watery; length when full-grown, 
Qe aDAT OE ieee cede clente: cree es ado Wan aes ene Agriolimax campestris 
Agriolimax campestris Binney 
Animal limaciform, with large, not flattened, tubercles. Color uniform grayish or amber, 
often black. Body sosmewhat compressed and keeled toward the caudal end. Tentacles 
dark-colored. Shield more than one-third total length of animal, rounded in front and 
behind. Respiratory orifice not differing markedly in color from remainder of mantle. Sole 
dark and longitudinally tripartite. Mucus clear and watery. Penis spiral. Length about 
25 mm. ° 
Agriolimax campestris, a native species, is closely related to A. agrestis. 
It differs from agrestis in being smaller, darker, and of a more uniform 
coloring. While agrestis seems to collect in large numbers and to thrive 
on cultivated crops, campestris 1s more inclined to be solitary and to 
frequent woods and meadows. In April, full-grown campestris are often 
found under stones or in sod, and the eggs have been found at the same 
time. Eighteen of these eggs, taken on April 22, hatched between May 
21 and June 1. The young of campestris are darker than the young of 
7 Determined by H. A. Pilsbry. 
