SUBFAMILY LECANIINAE 179 



from South America on nutmeg; longulum Dougl. from New Zealand, 

 China, India, Mauritius, eastern United States, Mexico, West Indies, 

 Hawaiian Islands on Psidium, Bambusa, Acacia, Citrus, Ficus. etc.; 

 mangiferae Green from Ceylon, West Indies on Mango, cinnamon, nut- 

 meg, bread-fruit, etc.; melaleucae Mask, from Australia, China, Massa- 

 chusetts on Melaleuca; minimum Newst. from England, Mexico on Areca, 

 Abutilon, fan-palm; nanus Ckll. from Trinidad on "Balata"; pseudo- 

 hesperidum Ckll. from Canada on Cattleya; rubellus Ckll. from Jamaica; 

 schini Ckll. from Mexico on "Nancem"; terminaliae Ckll. from Jamaica, 

 Mexico on Terminalia; ventralis Ehrh. from California, Japan; viridis 

 Green from Ceylon, Brazil, Mauritius on Cinchona, Citrus, Gardenia, tea, 

 coffee, etc. 



Eulecanium Ckll. — This genus contains over seventy species of 

 which nearly fifty are found in America and of these forty-five are re- 

 corded from the United States. It is likely that a considerable number 

 of these are synonyms. Six of the more common species can be sepa- 

 rated by means of the following table which is based for the most part 

 upon a table by Dietz and Morrison: — 



SPECIES OF EULECANIUM 



a. Adult female with median spina more than twice as long as either 

 lateral spina; dorso-meson with row of dorsal tubercles extending 

 cephalad from opercula; fringe setae four in number; operculum 

 with outer and basal margins subequal and slightly longer than 

 greatest width of operculum. — East of Rocky Mountains on peach, 

 plum, apple, maple, etc. nigrofasciata Perg. 



aa. Adult female with median spina always less than twice as long as 

 either lateral spina; dorso-meson not with row of dorsal tubercles. 



b. Each operculum distinctly more than twice as long as wide. 



c. Alveolae promiscuously arranged, not in irregular transverse 

 groups; species large, ten to thirteen millimeters long. — East- 

 ern United States, Canada on apple, plum, linden, poplar, etc. 



caryae Fitch, 



cc. Alveolae arranged in irregular transverse groups; species 

 small, four to six millimeters long. — Europe, Indiana, Oregon 



on apple, Crataegus. bituberculatum Targ. 



bb. Each operculum never more than twice as long as broad. 



c. Lateral spinae never twice as long as marginal setae of aver- 

 age length, 

 d. Alveolae arranged in more or less irregular bands. 



e. Alveolae at least near middle of the dorsum large and 

 arranged in single rows radiating from meson; cuticle 

 nearly smooth, not wrinkled or roughened. — Eastern 



United States, Canada on arbor-vitae lletcheri Ckll. 



ee. Alveolae all subequal in size and small, arranged in ir- 

 regular rows radiating from meson; cuticle Irregularly 

 roughened. — Europe, United States on Cornus, Ribes, 

 Corylus, Pyrus, Tilia. corni Bouche. 



