40 THE CALIFORNIA SPECIES OF MEALY BUGS 



The chitinized area on the ventral side of the anal lobes is remarkably con- 

 stant in size and shape. I have examined specimens from cacao and an unknown 

 host from Samoa, greenhouse plants from Ohio and Stanford University and from 

 citrus from southern part of California and find practically no variation, except 

 for a very weak chitinization about the anal cerarii of the Samoan specimens. 



Pseudococcus citrophilus Claussen. 

 Plate 1, fig. 6. 



1915. Pseudococcus citrophilus Claussen, Calif. Agr. Exp. Sta. Bull. 258:30-35, 

 figs. Ib, 6, 7. 



In life. Covered with white wax except for four longitudinal rows 

 of conspicuous impressed dots on the dorsum. Marginal tassels very 

 short and quite stout. The single pair of elongated caudal tassels are 

 from one-fourth to one-third the length of the body and are likewise 

 quite stout. Oviparous. 



Morphological characteristics. 17 pairs of cerarii present, the an- 

 terior 3-4 pairs with three conical spines, the remainder with but two, 

 those of the anal pair considerably larger than those of the others. Each 

 lateral cerarius with numerous pores and four or more auxiliary setae. 

 Penultimate pair surrounded by a small circular chitinized area contain- 

 ing numerous pores. Anal lobe pair surrounded by a large, well defined, 

 more or less oval chitinized area with many pores, which are more or 

 less scattered, and with several long, slender setae. Ventral side of 

 each anal lobe with a small but distinct chitinized area extending in from 

 the base of the anal lobe seta, bearing two slender setae at its posterior 

 tip. Dorsal body setae small and slender, not numerous. Cylindrical 

 ducts of two sizes present, the smaller without an elevated rim at the 

 mouth predominating. Anal lobe setae equaling anal ring setae. 



Immature female in general resembling the adult, differing in the 

 weaker development of the cerarii. 



Type host and locality. These have not been distinctly stated (the 

 species has not been formally described), but are probably to be taken 

 as citrus, at Upland, Calif. 



Hosts and distribution. The species is chiefly known as a pest of 

 citrus fruits in the southern part of the state. However Claussen has 

 recorded it from a wide range of hosts in that section. It also occurs on 

 oranges at Irvington in Alameda County and has been taken from laurel 

 in a greenhouse at Oakland. 



Authentication. Metatype material examined. 



Notes: The longitudinal rows of impressed dots in the living insect are 

 quite distinctive. Morphologically the species most nearly resembles P. comstocki 

 (Kuwana) from which it can be distinguished only by the presence of a chitinized 



