INSEcTS AND OTHER ANIMAL Pests INsguRIOoUS To FreLD BEANS 983 
slugs; Lovett and Black (1920) add sow bugs, earthworms, and aphids 
to this list; Taylor (1907) records a case in which A. agrestis killed and ate 
slugs of the species A. campestris when the two were placed in the same 
box; and Lebour (1914-15) finds that they eagerly devour the proglottides 
of Moniezia, a tapeworm of sheep. It would seem, therefore, that, while 
the slugs usually prefer a vegetable diet, under some conditions they relish 
animal food. 
DESCRIPTION OF STAGES 
The egg 
The egg of Agriolimax agrestis (fig. 87, C, page 954) is elliptical or spher- 
ical in shape, and is translucent, jelly-like, bluish white, and iridescent. 
Under magnification the thin outer covering is found to be slightly 
roughened “with regular raised and depressed areas. The eggs are found 
either singly or in masses, in the latter case being held together by a trans- 
parent secretion. On one end the small, projecting micropyle is visible, 
especially in newly deposited eggs. The eggs vary from 1.6 to 3 milli- 
meters (1/16 to 1/8 inch) in length. ~ 
The young slug 
A newly hatched specimen of Agriolimax agrestis is without definite 
form at first, but 1t soon assumes much the same appearance as its parent 
except that its tentacles are relatively larger and its body is transparent, 
permitting the black nerve cord running to the eye to be easily seen thru the 
body covering. Young slugs have a pinkish tint at first, but later turn 
to darker hues as they begin feeding. 
The full-grown slug 
The slug (Plate LXTX, 6, and fig. 87, D) is described by Taylor (1907 :105) 
as follows: 
Animal limaciform, with large but flattened tubercles; of a somewhat uniform whitish or 
pale ochreous ground colour, but sometimes dull lavender or other tint, often mottled, speckled 
or reticulated with brown or black, and at times totally suffused with black; body somewhat 
compressed and keeled towards the tail; tentacles dark coloured; shield more than one-third 
the total length of the animal, rounded in front and behind, concentric striae not deep, with 
the nucleus on the right side and towards the rear; respiratory orifice with a broad usually 
unpigmented raised ring, which is cut anteriorly by the anal cleft; sole pale and’ longi- 
tudinally tripartite, the side areas sometimes darker, especially towards the tail; sole-fringe 
separated as usual from the body by a furrow, containing a row of elongate tubercles, upon 
which the body tubercles rest unconformably. Mucus plentiful and viscous, often clear 
when crawling, but becoming milky-white on irritation, due to innumerable particles of car- 
_bonate of lime. 
Length usually about 35 mill, 
