Typua Insects: THetrr HcoLtocicAL RELATIONSHIPS 483 
a little arched. Eyes naked. Clypeus mucronate. Palpi prominent, concolorous. Mark- 
ings obsolete. The fine dark linear denticulate t: p. line barely discernable. Stigmata 
|very vaguely indicated by paler shades. Hind wings with a faint mesial black shade band; 
centrally stained with b!ackish; fringe and external edge like abdomen and very little paler 
jthan the rest of the insect. Beneath pale, with the disk of fore wings blackish; a common 
blackish extra-mesial shaded line. Minute black discal points. Smaller than Typhae. 
Arsilonche albovenosa Goeze . 
| Arsilonche albovenosa Goeze is another member of the family Noctuidae. 
It is found in Canada and in the northern, eastern, and central parts of 
the United States. It is a general feeder and has been reported on willow, 
smartweed, buttonbush, grass, and other plants. Typha latifolia, the 
writer believes, is here reported for the first time as a food plant of this 
|species. 
Life history and habits 
This moth is reported to have two generations a year. The writer, 
|however, has followed it through only one generation at Ithaca, where 
|two adults emerged on August 15. 
Egg-laying.— The eggs are deposited in long patches on the surface 
jof the cat-tail leaf, usually ten to fifteen inches from the tip. The eggs 
overlap one another as shingles do. They lie on the leaf in rows, the 
number of rows varying from three to seven, and the rows overlapping 
one another as well as the individual eggs in each row. ‘The number of 
|eges in one patch ranges from 60 to 161. 
As the egg develops, it becomes much darker, turning very dark just 
|\before the larva emerges. 
The larva.— Immediately after hatching, the larva devours the empty 
shell and then begins to feed on the surface of the Typha leaf, where it 
serapes off the chlorophyll. As thelarva grows and feeds more voraciously, 
it usually migrates to the end of the leaf, where it eats off the tip of the 
leaf or devours chunks out of the edge of the leaf, as shown in Plate 
XLVI, 62. 
When the larva has attained its full growth, it ties two cat-tail leaves 
together, and between them spins a tough cocoon in which it pupates. 
Two larvae pupated im the laboratory, under the author’s observation, 
jon July 23, 1916, and two others on July 25, 1916. The former both 
emerged on August 15, 1916. This apparently indicates the length of 
the pupal stage to be nineteen days. 
