ART. lU. MASKELL GENERA OF COCCIDAE MORRISON. 51 



differs prominently in shape from the type of that genus, T. 'perrisi 

 (Signoret). The writers incline to place Er'ium as a synonym of 

 Trionymus^ but leave a definite statement of transfer to some time 

 when the group can be studied as a whole. 



Genus PSEUDORIPERSIA Cockerel!. 

 Plate 3, tig. 2. 



Genotype. — Eriococcus turgipes Maskell. 



Reference. — Fernald, Cat. Cocc. World, 1903, p. 115. 



This was first established as a subgenus, with only the type species 

 included, and while later raised to generic standing, no other species 

 have been added to it. 



The Maskell collection contains five slides of the type, one of '' adult 

 female, dorsal view, 1892," one of " adult female, ventral view, 1892," 

 one of " anal ring, 1892," one of " larvae, 1892," and one of " larva, 

 1896." There is also some unmounted material bearing the Maskell 

 No. 267. 



Adult female. — Enclosed in a sac, body subglobular, slightly flat- 

 tened dorsally, etc., as described by Maskell in detail ; dorsal surface 

 more heavily chitinized, somewhat brownish, head and thoracic 

 regions very large, occupying fully three-fourths of the whole body 

 and bringing the posterior legs far back ; antennae small and incon- 

 spicuous, 6-seg'mented, the third and last segments about equal in 

 length ; legs relatively very large, short and stout, so arranged as to 

 give the appearance of six equidistant stout spikes projecting from 

 the circular body, the parts fused so that only two distinct segments 

 and a claw are visible, the outer segment with a cluster of tiny spines 

 beneath at the apex, this segment in the hind legs also with a cluster 

 of numerous tiny circular pores above, claw of peculiar shape, prob- 

 ably comprising both tarsus and claw, claw digitules tiny acute hairs ; 

 mentum long, tapering, but with apex rounded, distinctly 2-seg- 

 mented; only the posterior cerarii isolated, each surrounded by a 

 heavily chitinized half-oval plate, extending down and beyond the 

 apical seta, the cerarius made up of a cluster of lanceolate or sub- 

 lanceolate spines and triangular pores in about equal numbers; apical 

 seta shorter than anal ring setae; with the penultimate cerarius be- 

 ginning an almost continuous marginal row of triangular pores, 

 accompanied by more scattered and fewer lanceolate spines of vary- 

 ing sizes, this roAv wandering irregularly around the whole body mar- 

 gin from cerarius to cerarius, and paralleled by a less conspicuous 

 and less well-developed inner band, the pores in the bands set off 

 from the numerous similar surrounding pores by their larger size 

 and closer grouping, the spines accompanying this band becoming 

 fewer and more scattered anteriorly; dorsally, in addition to the 



