664 Wisconsin Academy of Sciences, Arts and Letters. 
Larva. —Length, 16-20 mm. Width, 4 mm. Body yellow¬ 
ish. Head and thorax yellow with many black and brown 
markings. A median longitudinal hand on clypens, broad at 
the anterior end, and on either side a broad band, the pair not 
quite uniting above; the posterior half of each band is not solid 
black, but composed of black patches connected by brown, 
though a variation to almost solid black may be noted (in the 
latter respect the European forms examined differ, the bands 
being more uniformly black) : outside of these bands are a 
number of small spots, irregularly placed, these being replaced 
by darker beneath, where the color varies (in both forms) from 
light brown to black: around the occipital foramen a darker 
border. Anterior third of pronotum and posterior border black, 
the limits of the color more or less distinctly marked: a short 
diagonal line in the anterior outer corner of the lighter area 
across the middle of the segment ; a group of spots on the pos¬ 
terior outer angle, a small longitudinal bar on either side of 
the median line posteriorly, and a pair of spots before the bars, 
but more widely separated. Mesonotum often quite dark, with 
markings indistinct, but in the most favorable specimens (es j 
pecially in preserved material) the posterior border is seen to 
be black, the band wide at* the posterior outer angle: an indis¬ 
tinct and more or less broken “V” on outer anterior corner : 
some small spots on the outer portion, and, near the median 
line, there can usually be distinguished a pair of small spots 
lying anterior to a pair of small transverse bars. In the speci¬ 
mens at hand the bands of the prothorax appear rather more 
-distinct on the European individuals, while the markings on the 
mesonotum are less distinct, the whole segment being darker. 
However, the individual variation is considerable in any set of 
specimens. Legs yellow with brownish spots on the outer side. 
Ho gill-filaments appear on the eighth segment, as shown in the 
diagrams of Silfvenius (1902) and Ulmer (1901) : these may 
occur on our forms perhaps, but certainly not often. In only 
one of four individuals from Europe did I find a single fila¬ 
ment on this segment. 
Pupa. —Length, 18-20 mm. Width, 4 mm. Antennas ex¬ 
tending to the 7th segment. Body yellowish. Dorsal hooks, 
