222 Psyche [December 
The characters that distinguish N. maculalis from N. obscuralis 
are, then, the equal number of filaments on the anterior and 
posterior infrastigmatals, and the fact that the seventh abdomi- 
nal segment has one less pedal gill-filament than the more anter- 
ior ones. The filaments are also proportionately longer and the 
unbranched basal portion is longer. These characters will hold 
at least as early as the stage with two gill-filaments. From 
Hydrocampa gyralis (?) and icciusalis, it can be easily distin- 
guished by the gills, and also by the spiracles, of which those on 
segments, 2-4, of the abdomen are equal, but minute (the size of 
the smallest in N. gyralis (?); and that of the first segment and 
the posterior ones are equal and rudimentary. The caterpillar 
becomes pale yellow just before pupation. Food Nympheacee. 

Fig. 1. Front and labrum of Nymphula maculalis. 
Fig. 2. Antenna of N. maculalis. 
Fig. 3. Tracheal gill of Nymphula. 
Pupa similar in general form to that of obscuralis, as described by Dyar, but of 
the seven ridges near the tip of the abdomen beneath, only the central one remains, 
and the anal opening is not distinctly Y-shaped. The case for the hind legs varies 
considerably in length. 
2. N. seminealis. Was not quite so common as the last; 
and the males did not rove as widely. No specimens were taken 
far from Limnanthemum. 
o&. Whitish, powdered with dark brown, giving a chocolate brown effect. Trans- 
verse posterior line broad, even and white, strongly contrasting; running from the 
