224 Pysche [December 
or is occasionally detached and carried about, especially in captivity. In my full 
grown caterpillars the filaments were arranged as follows: 
Segment. D2" SAL S2r Sava 5 6 i oe 
Anterior suprastigmatal............... 44 3'53' SS 8 38) sae 
Posterior suprastigmatal.............. 82°83 (4 4) A AAD Ae eS 
Bateralin, soto ete oea seep ine Be ET, Bas 
Antertorintrastigmataleis de. - eee S43 030878 or oes ; 3 
Posteriorinirastigmatal a. specie: ele 4444444 4 4 4 
J eee I Aer bs ts ER AE Ned oh Ie iS oe -444444443 = 
From N. maculalis it may be distinguished by the fact that the 
anterior infrastigmatal has constantly one less filament than the 
posterior; and that the number of filaments in the pedal row is 
not reduced until the last one if at all. This distinction holds in 
the two-gilled and all later stages, and also applies to the other 
members of the subgenus, obscuralis and stratiotata. 
Food Limnanthemum; will eat Potamogeton in captivity. 
The pupa seems identical with that of N. obscuralis; but the hind- 
leg case is quite variable, sometimes as long as the body. 
3. N. obscuralis. I have a single specimen of this species, caught 
at Worcester, but probably not coming from Lake Quinsigamond. 
Ground color, whitish powdered with black-brown like male seminealis, but even 
duller, the powdering forming a darker median shade. T. p. line white, narrow, 
forming deep inward cusps opposite apex of cell and on vein 4, lost below vein 4; 
subterminal space rather warmer brown, but terminal space concolorous. Sub- 
terminal line sharply and deeply serrate on the veins. Wings entirely without 
bronzy reflections, but the hind wing is marked exactly as in N. seminealis. 
4. N. badiusalis. Not common, with N. allionealis, and nearer 
shore. The caterpillar may possibly feed on some submerged 
plant. 
5. N. allionealis. Not common, and only in a single station. 
Judging by the related European species stratiotata the caterpillar 
will feed on such a plant as Elodea, and will have one more fila- 
ment in the posterior subdorsal gills than in either of the infras- 
tigmatals. 
6. N. gyralis. Was common enough, especially in Flint’s Pond, 
to the south of the lake proper. It was the only member of its 
group (typical Hydrocampa) that was seen at the lake, so I place 
