A Study of Some Specific Characters of the 

 Genus Pseudococcus 



p. B. SMITH 

 ENTOMOLOGICAL LABORATORY OF CORNELL UNIVERSITY 



The first part of this study was published in September, 

 1911.* In that paper an examination was made of the charac- 

 ters commonly used in descriptions of species of this genus. 

 This paper is a continuation of the preceding study and in it 

 new characters or characters not commonly used in systematic 

 work are examined. Five species, namely, agrifoliae Essig, 

 crawii Coq., obscurus Essig, citri Risso, and loiigispinus Targ. 

 are considered. Adult specimens have been used throughout. 

 As a considerable number of specimens of each species were 

 available the study has been comparative. 



The work was carried out under the direction of Prof. Alex. 

 D. MacGillivray and the writer wishes to again express his 

 appreciation for the invaluable aid received. 



Following is a discussion of the various characters for each 

 species. 



ANAL RING— (Figs. 1-5) 



So far as known to the writer a study of the anal ring has 

 not been made nor has it been figured in any detail. In 

 ordinary mounts the complete anal ring very seldom shows 

 with any clearness because the entire ring or parts of it at 

 least are at an angle to the slide. The ring must lie flat and 

 parallel to the slide to get the correct relations of the parts. To 

 accomplish this the specimens were carried through the clearing 

 stage in the usual way. Then under the dissecting niieroseope 

 the anal ring and lobes were dissected out and mounted. In this 

 way flat mounts were secured from which camera lucida draw- 

 ings could be made. 



The anal ring consists of two unclosed concentric circles of wax 

 pores, between which are three pairs of stout setae. Within this, 



"Ann. Entom. Soc. Am. Vol. IV, Xo. 3, pp. 309-3;7. 



