ART. 12. MASKELL GENERA OF COCCIDAE MORRISON. 37 



Only the Maskell slide mounts have been available for study, and 

 as these have not proven entirely satisfactory the following descrip- 

 tions haA^e been confined largely to notes on certain points. 



Adult fejnale. — This stage much as described by Maskell, except 

 for the anal ring, this having six short stout setae, as noted by 

 Ferris ; the multilocular pores of Maskell's description, so far as can 

 be noted, all trilocular, set at the bottom of short tubes, these appear- 

 ing rifled as a gun barrel and their openings each surrounded by a 

 circular chitinized plate; disk pores at the spiracular openings also 

 apparently, but not certainly, trilocular; the exact character of the 

 two glandular patches close to the posterior spiracles not determin- 

 able, but apparently made up of large simple pores, each surrounded 

 hj a chitinized circle and set in a polygonal area ; only one type of 

 body seta noted, these rather short and fairly stout. 



Intermediate stage^ fetnale. — Differing from the adult, as noted by 

 Maskell, in the smaller size, the presence of the legs, and in other 

 particulars; both the tarsal and claw digitules present, not wanting 

 as suggested by Maskell ; with six anal ring setae, not two, and the 

 ring set at the inner end of a tube as in the adult; body pores and 

 setae apparently much as in the adult, but without the glandular 

 patches behind the posterior spiracles as in the adult. 



Larva. — Quite as described and figured by Maskell and Ferris. 



With regard to the species placed in this genus by Maskell, a 

 number have already been removed to other genera, and for the 

 remainder it is possible to confirm the suggestion made by Ferris in 

 discussing this genus, to the extent that none of the Maskell species 

 now referred to the genus are congeneric with the type species, al- 

 though such peculiar and diverse forms are included under this name 

 that it is impossible to reassign them without extended study. 



The following generic diagnosis is given for the sake of complete- 

 ness in this paper. 



GENERIC DIAGNOSIS OF SPHAEROCOCCUS. 



Pseudococcine forms having dorsal ostioles, adult female globular, 

 naked, antennae rudimentary, legs wanting, posterior spiracles ac- 

 companied by a large poriferous tract, anal ring set at the inner 

 end of an invaginated tube, with pores and six setae, anal lobes want- 

 ing, derm with only one type of seta, and with only trilocular pores ; 

 intermediate stage, female, similar to adult, but smaller, lacking the 

 poriferous patches and with the legs present and the antenna^e more 

 developed ; larva long oval, with 6-segmented antennae, normal legs, 

 anal ring with pores and six setae, anal lobes slightly produced, with 

 one pair of cerarian spines, one slender, and a long apical seta on 

 each, and with some longitudinal rows of trilocular pores and slender 

 setae. 



