224 Journal New York Entomological Society, t^'oi- xxv. 



syn. ? crenatus Germar, Fauna Ins. Europa., XVII, p. lo, 1834, 



Jassus. 

 Kirschbaum, Cicad. v. Wiesbd., p. 167, 1868, Bythoscopus. 

 syn. gennari Fieber, Verb. Zool.-Bot. Ges. Wien., XVIII, p. 



451, 1868. 

 syn. gemmisimulans L. & C., Jl. Econ. Ent., VIII, p. 542, pi. 



30, 1915- 



The species as observed by us exhibits some variation as to mark- 

 ings and intensity of color especially in the males. The females are 

 lighter than the males and have their wing markings less pronounced. 

 The majority of the second brood of females were of a decided red- 

 dish brown color. As already noted there is considerable variation in 

 nymphal color markings but among the many which we have ob- 

 served, none has been found which exactly corresponds in color 

 markings to those illustrated by Leonard and Crosby. 



It is evident that Idioccrus scurra is not a native American spe- 

 cies. It was probably brought into this country from Europe, evi- 

 dently in the egg stage with Lombardy poplar which was the first 

 ornamental tree introduced into the United States. It is said that the 

 native home of the Lombardy poplar is Afghanistan and that in early 

 times it was cultivated in western Asia whence it was introduced 

 into Europe. In New Jersey at least, /. scurra is becoming more 

 abundant and widely distributed. In several cases it has been noted 

 as occurring on poplars growing along city streets. 



In closing we wish to express our indebtedness to Mr. E. P. Van 

 Duzee for identifying the species and for his cooperation and help 

 and to Mr. Andrew J. Mutchler for valuable assistance in enabling 

 us to see the literature in the library of the American Museum of 

 Natural History. 



EXPLANATION OF PLATE XV. 



Fig. I 

 Fig. 2 

 Fig. 3 

 Fig. 4 

 Fig. 5 

 Fig. 6 

 Fig. 7 

 Fig. 8 

 Fig. 9 



Twig with buds removed showing raised bark over eggs. 



Bark removed showing eggs in position. 



Egg. 



First stage nymph. 



Second stage nymph. 



Third stage nymph. 



Fourth stage nymph. 



Fifth stage nymph. 



Adult male, Idioceriis scurra Germ. 



