I893-J 155 [Dyar. 
I owe to the kindness of Miss L. M. Hallowell of WestMedford 
the opportunity to observe the larval stages of the Gypsy moth, 
the interesting liparid so recently added to our fauna. The 
larva is closely allied to Notolophus (= Orgyia of Smith's list) , 
possessing the dorsal retractile tubercles on the 6th and 7th 
abdominal segments, and the enlarged subdorsal warts on the 
prothoracic seguient ; but it differs in two important resj^ects from 
all the known American species of Notolophus and Parorgyia. 
The first is the absence of the peculiarly branched or plumed hairs 
which form the defensive "pencils" and "brush-tufts" of our 
species. All the hairs of P. dispar are simple. The second is 
the presence of an additional series of eversible dorsal glands, 
not j^resent in Orgyia. These are very small structures, situated 
in pairs on the first to fourth abdominal segments each side of the 
dorsal line and anterior to the warts. Porthetria further differs 
from ISTotolophus in that the warts of row 4 are well developed 
instead of being rudimentary ; but they have the same location, 
though their size causes them to become confluent with the 
warts of row 3. In other respects, as well as in the general 
system of coloration, the larvae of these genera are alike. The 
female moths, though winged, seem to fly but little, being, in 
this respect, intermediate between the almost wingless females of 
Notolophus and the strongly flying ones of Parorgyia. The 
species hibernates in the egg state like Notolophus and unlike the 
species of Paroi-gyia, which hibernate as half-grown larvae. On 
the other hand P. disjMr forms a very weak and frail cocoon, 
unlike both of the American liparid genera with which I have 
compared it. 
Porthetria dispar Linn6. 
1758— Liniie, Syst. nat., 1, 501. 
JEgg. — Spheroidal; flattened, even concave below when old, smooth, 
shining orange flesh color. Under a half-inch objective it appears 
slightly wrinlvled and punctured but obscurely so. Diameter 1.1 mm. 
Laid in a mass or heap, thickly covered with short brown hairs from the 
body of the $ moth. 
First larval stage. — Head rounded, shining black; width 0.6 mm. Body 
brown, densely clothed with short pale hairs. Thoracic feet black. 
Warts large, bearing many hairs, the subdorsal pair on joint 2 (row 3) 
especially large and conspicuous Avith long hairs which overhang the 
head. Abdominal feet long, with large claspers. The hairs are glassy 
white, slightly barbed or cleft with pointed ends, and furnished with a 
