Geometric! ae 



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 PHIGALIA 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 ERANNIS Hiibner 



(i) Erannis tiliaria Harris, Plate XLIV, Fig. 17,6. (The 

 Linden Moth.) 



The species ranges from the Atlantic coast to the Rocky 

 Mountains. 



Genus CINGILIA Walker 



(i) Cingilia catenaria Drury, Plate XLIV, Fig. 21,6. (The 

 Chain-streak Moth.) 



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 



(i) 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 THERINA Hiibner 



(i) Therina endropiaria Grote & Robinson, Plate XLIV. 

 Fig. 26, $ . 



347 



