Geometridae 
is winged, but the female is wingless and is so very different in 
appearance from the male that no one not familiar with the facts 
in the case would ever suspect both belong to the same species.” 
The best means of combating these pests has been found to 
be to spray the trees, when the caterpillars are just hatching, with 
a solution of Paris green and water, one pound of the poison to 
two hundred gallons of water. 
Genus PHXGALIA Duponchel 
(i) Phigalia titea Cramer, Plate XLIV, Fig. 16, $. 
Syn. titearia Guenee; revocata Walker; strigataria Minot. 
The species is found in the Appalachian subregion, and is 
very common in Pennsylvania. 
Genus ERANNXS Hiibner 
(i) Erannis tiliaria Harris, Plate XLIV, Fig. 17,5. (The 
Linden Moth.) 
The species ranges from the Atlantic coast to the Rocky 
Mountains. 
Genus CINGILIA Walker 
(1) Cingilia catenaria Drury, Plate XLIV, Fig. 21, $. (The 
Chain-streak Math.) 
Syn. humeralis Walker. 
The range of this species is much the same as that of the one 
which has just been mentioned above. 
Genus SICYA Guenee 
(1) Sicya macularia Harris, Plate XLIV, Fig. 22, $ , Fig. 23, 
$, var. 
This species has an extensive synonymy, the insects being 
variable in the amount of red which they show on the yellow 
ground-color of the wings. The student who wishes to go into 
these matters may consult Dyar’s List. The insect is very gen¬ 
erally distributed throughout our territory. 
Genus THERXNA Hiibner 
(1) Therina endropiaria Grote & Robinson, Plate XLIV. 
Fig. 26, 6. 
347 
