54 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



TOL. 60, 



In tlie remarkable structure of the body and the legs, this genus 

 seems to possess characters which make it stand alone among the 

 Pseudococcine forms, and to fully justify its isolation as a distinct 

 genus. 



Genus RIPERSIELLA Tinsley. 



Genotype. — Ripersia rumicis Maskell. 



Reference.— FQvn^ild., Cat. Cocc. World, 1903, p. 115. 



This genus name was first published by Professor Cockerell, with 

 a sufficient indication of Tinsley's authorship, and included two 

 species, but the type was subsequently designated by Professor Cock- 

 erell as Maskell's species. 



This species is represented in the Maskell collection by two slides, 

 one of " adult female, 1890," the other of " head and abdomen of 



Fig. 17. — RiPEHsiELLA Rujricis (Maskell) ; all figures of adult female. A. apex of 



ABDOMEN, X335; B. QUADRILOCULAR PORE, (PROBABLY A FREAK), X 1500 ; C. ANTENNA, 

 X335; D. MIDDLE LEG, X 335 ; E. SPIRACLE, X 1500 ; F. DOUBLE TUBULAR DUCT (PROBABLY 

 A FREAK), Xl500; G. TUBULAR DUCT, X 1500 ; H. TRIANGULAR PORE, TWO VIEWS, X 1500 ; 

 I. NORMAL MULTILOCULAK DISK PORE, X 1500 ; J. BODY SETAE, X 1500, 



adult female, 1890," and by a few unmounted specimens under No. 

 170. 



Adult female. — Practically naked, elongate oval when mounted; 

 antennae short and stout, placed very close together at the anterior 

 apex of the head, 6-segmented, the first and last longest, the last with 

 three stout spines ; legs small, stout, the tibia and tarsus about equal 

 in length, claw long, slender, only slightly curved near apex, with- 

 out denticle, claw digitules slender, apparently acute at apices, tarsal 

 digitules not observed, hind coxae without pores; mentum rather- 

 long triangular, indistinctly 2-segmented; spiracles small, not ab- 

 normal; with four pairs of dorsal ostioles; anal ring small, stout, 

 with six well-developed setae, without pores of the type found in the 

 ring of Pseudococcus, for example, but with some relatively large, 

 faint, uneven areolation; cerarii wholly wanting, tlie anal lobes not 

 developed, their location indicated by a group of three setae about 

 as long as those of the anal ring and placed on each side of this; 



