10 



nitely that he had taken it as the type ; and because the first species 

 he discussed under the genus was aceris which I have found to be a 

 synonym of salicis. 



SYNOPTIC TABLE OF SPECIES. 



Median carina of male scale fairly distinct, . . 2. 

 Median carina of male scale very indistinct or absent, n. 



( Inner edges of median lobes fused together, See Plate 8, Fig. 3. 



2. < america?ia. 

 ( Inner edges of median lobes not fused together, . 3. 



( Anterior group of second row of dorsal gland-orifices present, 4. 



3. < Anterior group of second row of dorsal gland-orifices absent, 

 ( dysoxyli. 



( Inner lobule of the second lobe approximately one-third as 



J wide as the median lobe, .... wistariae. 



I Inner lobule of second lobe at least one-half as wide as the 



^median lobe, 5. 



j Mature female scale usually more than 2 mm. long, . 6. 

 5' ( Mature female scale usually less than 2 mm. long, . corni. 



, ( Fifth group of gland-spines numbering from one to three, 9. 

 \ Fifth group of gland-spines numbering from three to eleven, 7. 



( Median lobes very broadly rounded at their extremities and set 



7. < close together. See Plate 5, Fig. 3 and Plate 8, Fig. 6, furfura. 



( Median lobes not as above described, ... 8. 



g f Median lobes indistinctly pointed. See Plate 7, Fig. 9, lintneri. 

 \ Median lobes rounded, . herbae, salicis, salicis-nigrae. 



{ Median lobes parallel in general direction, . pinifoliae. 

 9' \ Median lobes divergent, 10. 



( Median lobes large and prominent. See Plate ^^Yig. 



10. -j Median lobes rather small and inconspicuous. See Plate 7, 

 ( Fig. 4, ..... .pinifoliae heterophyllae. 



( Inner edges of median lobes fused together. See Plate 8, 



11. -< Fig. 5, caryae. 



( Inner edges of median lobes free, . . . .12 



( Median lobes parallel in general direction; indistinctly 



12. -j serrate 13 



( Median lobes divergent ; distinctly serrate, . . platani. 



( Fifth group of gland-spines numbering less than iom,longi/oba. 



13. < Fifth group of gland-spines numbering more than four, 



( ortholobis. 



