12 PAPERS ON COCCID^E OR SCALE INSECTS. 



Credit is due Mr. J. G. Sanders, of this Bureau, who made the photo- 

 micrographs of the anal plates of the species described in this paper. 

 While it does not seem possible to get a photograph which will show 

 satisfactoril}^ all the structural characters of the anal plate, these 

 photographs are still very helpful as supplementing the text,, and 

 give a general pictorial effect wdiich it is impossible to convey by 

 description. 



ASPIDIOTTJS (s. str.) COMPEREI n. sp. 



(Plate I, tig. 1.) 



Scale of female: About 1 mm. in diameter, strongly convex, nearly 

 circular. Exuviae covered, but covering secretion easily rubbed off, 

 exposing the lemon-yellow to brown exuviae. Secretion covering 

 the larval exuvia sometimes more dense and adherent, thus some- 

 times giving the scale an annulated appearance due to the second 

 exuvia showing through the section surrounding the larval skin. 

 Secretionary supplement normally white, sometimes slightly yel- 

 lowed. Ventral scale inconsiderable. 



Scale of male: About one-half the size of the female scale, and of 

 the normal oval shape. 



Adult female: In balsam mount, nearly circular and hyaline, with 

 a diameter of about 0.8 mm.; anal plate broad, rounded, about 

 0.2 mm. long by 0.3 mm. broad, for the most part hyaline, apical 

 third very slightly suffused or chitinized; three pairs of very small, 

 narrow, subequal lobes; median lobes rectangular and more heavily 

 chitinized than laterals, and with chitinization, not sharply limited, 

 extending into the pygidium something more than a lobe's length; 

 lateral lobes with distinct outer shoulder and somewhat constricted 

 at base, hyaline; a projection is sometimes seen at some distance 

 anterior to the third lobe having the appearance of a rudimentary 

 fourth lobe; incisions shallow, given a truncate appearance by the 

 occurrence of marginal pores; paraphyses wanting; plates about 

 lobe length, inconspicuous, apparently two median, two in first 

 incision, and three in second incision, with some additional rudi- 

 mentar}^^ plates beyond second lateral incision; spines normal; anal 

 opening oval, very large, larger than the two median lobes together, 

 remote from tip, near center of the segment; paragenitals repre- 

 sented only by the anterior lateral groups, which consist of from 1 

 to 4 (usually 2) glands; dorsal glands small and rather numerous, 

 limited to the apical third of the margin of the segment; basal thick- 

 enings wanting; ventral thickenings not present as a divaricating 

 band from the tip, but represented by the uniform chitinous suf- 

 fusion of the apical third of the segment. 



