226 Psyche [December 
case is anchored beneath the water on the submerged stem, and 
remains there. The moth evidently swims or walks up through 
the water before expanding, and so is more or less amphibious. 
My specimen was found on Potamogeton, in comparatively deep. 
water, and did not eat Limnanthemum, so far as I could tell, 
though that is much more closely related to the food plant that 
Packard reported, Menyanthes. It was quite surprising to find 
that this moth, the one generally found nearest shore, had a 
caterpillar just as aquatic as that of gyralis; and a pupa that is. 
actually submerged. 
8. Pyrausta nelumbialis. The caterpillar was found on yellow 
pond lily; in the top of the petiole. 
SYNOPSIS OF THE AQUuATIC NYMPHULINE CATERPILLARS. 
With tracheal gills; second and third abdominal spiracles equal 
Anterior and posterior infrastigmatal gills with the same numberof 
filamentsrn ee vusteee ae atthe rae eee (subgenus Nympheella Grote) 
Maximum number of filaments five; on Nympheacee....... N. maculalis 
Anterior infrastigmatal gills with one less filament 
Posterior subdorsal gills with one more filament than infrastig- 
TNA TALS RM aay tee AA cree iors ees Olen (subgenus Paraponyx Hiibner) 
N. stratiotata of Europe and probably N. allionealis of America 
Posterior subdorsal, and infrastigmatal, and pedal gills with the same 
Humbersofmilamentsiewieie vee + eee (subgenus Oligostigma Guénée) 
With a maximum of six filaments in adult; usually on 
Wallisneriant? Stabs es Satie eae ee eee N. obscuralis 
With a maximum of four filaments; usually on Limnan- 
Planeta 4.) oh ae of ti ek ee N. seminealis 
Wn eri yaya tee teseet A, ee Pe RON ieee | Ran He N. badiusalis. 
Without tracheal gills 
Second abdominal spiracle decidedly smaller than the third; stout 
and flattened; head darker than body (subgenus Hydrocampa Latreille) 
Head dark chitin-yellow; in a nearly circular case 
Body whitish; thoracic tubercles more distinct than abdominal 
ones; head with a lateral dark brown stripe; on Potamo- 
[Lol 5) Seats A AoE Res Oe a Sa PI ROM SEROL UREA ADS Aba N. obliteralis 
Body pale yellow; tubercles all similar; head without dark 
brown except in mouth-parts; on Nuphar (Nympha)...N. gyralis (?) 
Head dark brown; body dirty gray; in an oblong case on Potamo- 
geton and probably Menyanthes....................0-6- N. icciusalis. 
Cylindrical and moniliform; head paler than body; forming a cylin- 
drical or ellipsoidal case of a mosaic of Lemna plants............ Elophila 
The American species have not been described. 
