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 spfna 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 fletcheri 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. 



