SUBFAMILY ORTHEZIINAE 111 



cc. Adult female with three or more mesal plates. ArctortJiezia Ckll. 

 aa. Antennae of the adult female with less than nine segments and of 

 nymphal female of less than six segments. 



b. Antennae of adult female with four or more segments and of 

 nymphal female with four segments; tibio-tarsal suture of each 

 leg wanting, so that claw appears to be continuous with tibia. 

 c. Antennae of adult female with six or seven segments and of 



nymphal females with four segments. Neiosteadia Green. 



cc. Antennae of adult female and of nymphal female with four 



segments. Othcziola Sulc. 



bb. Antennae of adult female and of nymphal female with three seg- 

 ments; tibio-tarsal suture of each leg wanting, but claws distinct- 

 ly separated from tarsus. ISlipponortliezia Kuv/. 



Donglasia MacG. — This genus includes a single species, maen- 

 ariensis Douglas, from the Island of Montecristo, Italy on Erica. The 

 head plates are small and not strongly projecting or divergent. The 

 lateral plates are less than the typical number. Douglas figures the 

 ovisac with ten longitudinal ridges. 



Orthezia Bosc. — The great majority of the described species of 

 this subfamily belong to the typical genus Orthezia. The species are 

 difficult to recognize because of the different nomenclature used and the 

 different value assigned the same characters by different authors. It is 

 not unlikely that some of the species included in the following table 

 have been misplaced for this reason. The table includes most of the 

 American species. It is unsatisfactory, but may prove of value in the 

 identification of specimens. In every case the specimens should be com- 

 pared with the original description. 



SPECIES OF ORTHEZIA 



a. Dorsal surface of body of the adult female exposed between dorsal 



and lateral plates or caudad of dorsal plates or mesal and dorsal 



plates wanting; uncovered portion sometimes covered with mealy 

 wax. 



b. Portion of dorsal surface of adult female not covered by plates of 

 wax much greater in extent than covered area. 

 c. Dorsal surface of body of adult female completely exposed be- 

 tween lateral plates, dorsal plates entirely wanting; ovisac 

 slightly longer than body; antennae consisting of eight seg- 

 ments. — Arizona on Quercus. nuda Ferris. 



cc. Dorsal surface of body of adult female always with two rows 

 of dorsal plates. 



d. body of adult female exposed as black mesal band between 

 two rows of dorsal plates. 



e. Dorsal plates much farther apart, more divergent on tho- 

 rax and cephalic abdominal segments; dorsal plates sub- 

 equal in length and thickness. — United States, Mexico, 

 West Indies, British Guiana, Brazil, England, South Af- 

 rica, Mauritius, Ceylon, China on Coleus, Lantana, 



