March, 1896,] D\ T AR AND MORTON, NEW YORK SLUG CATERPILLARS. 
5 
raised, but very distinct. Surface smooth and level, or a little grooved 
longitudinally from shrinking. Dimensions i.8xi.2Xo.i mm. 
The embryo lies curled on its side, the head and tail touching, 
greatly flattened laterally. Before hatching it shortens and thickens, 
the egg swells up so as to be much higher than before and the larva 
emerges through a small hole which it eats in the shell. 
S/age /.—(Plate I, fig. i). Shape essentially as in the mature larva. 
The horns only grow a little after hatching, being distinct before. 
Tubercles of the subdorsal row (tubercles i+ii), of lateral row (iii), each 
with three setae, all raised on conical projections of the body (Plate I, 
fig. 3) forming horns; those on joints 3, 4, 5, n and 12 of the sub¬ 
dorsal row about twice as long as the others. Lateral row on joints 3, 
4, 6, to 12, subequal. Subventral row represented by small setae. Joint 
2 not retracted below joint 3 even when walking, setiferous. Cuticle 
smooth, without spines. Color entirely light yellow, without marks, 
the horns a little whitish. Head concolorous with the body, clear yel¬ 
low; ocelli brown; width .3 mm. (calculated .25 mm.). Length on 
hatching 1.3 mm. 
The larvae do not feed in this stage, but after hatching and eating 
a portion of the shell become quiescent and molt in two days. 
Stage II .—Horns densely spined with many sharp stiff bristles, as 
in the mature larva (Plate I, fig. 4). The subdorsal on joints 3 to 5, 
11 and 12 longer than the others, but rather shorter conic than before; 
joints 6 to 10 with only one or two short setae, the tubercles rudimen¬ 
tary. Lateral row moderately developed on joints 3 and 4, smaller on 
joints 6 to 12, the spines less numerous than on the subdorsal horns, 
some of them hair-like. Spiracles moderately distinct, arranged as in 
the figure of stage I. Color whitish yellow without marks. Segments 
distinct, skin smooth, with just an indication of granulations. Magni¬ 
fied 350 diameters, this appears as an irregular puncturing or confused 
shagreen of the surface, but indistinct. Joint 2, as in the previous stage. 
Head pale yellow, ocelli black, mouth brown ; width .4 mm. (calculated 
.35 mm.). Cervical shield is distinct, dark, bisected, level with the 
skin. Toward the end of the stage, a whitish line appears along the 
subdorsal ridge, defined by black dots inwardly and a black line out¬ 
wardly on joints 6 to 10; the horns become shaded with blackish, and 
the space between them crossed by transverse lines. Length of the 
larva, 1.3 to 2 mm. 
Stage III —(Plate I, fig. 2, diagram of the markings). Elliptical, 
highest through joints 4 and 5, diminishing posteriorly; ridges not 
