176 The Philippine Journal of Science 1920 
Pseudococcus lilacinus Ckll. 
Pseudococcus lilacinus Cockerell, Proc. Dav. Acad. Sci. 10 (1905) 
128; Robinson, Philip. Journ. Sci. § D 12 (1917) 7. 
Pseudococcus tayabanus Cockerell, Proc. Dav. Acad. Sci. 10 (1905) 
129; Robinson, Philip. Journ. Sci. § D 12 (1917) 7. 
Dactylopius crotonis Green, Tropical Agric. 24 (1905) 44 (without 
description) ; Green (as n. sp.), Journ. Econ. Biol. 6 (1911) 35, fig. 
I am able to indicate the above synonymy through having type 
material of these three species available for examination, due 
to the kindness of the describers, Professor Cockerell and Mr. 
Green, in presenting material to the United States National 
collection of Coccidsa. The two lots of type material of Cock- 
erell's species are very similar in general appearance before 
Fig. 18. Pseudococcus lilacinus Ckll., adult female ; a, posterior apex of abdomen, showing 
cerarii, ventral chitinized thickening, anal ring, apical setae, etc., X 115 ; b, hind leg, showing 
numerous minute pores on coxa and tibia, X 115. 
mounting, and each is labeled “part of type” — of lilacinus and 
tayabanus, respectively. The two lots are of the same species 
so far as I have been able to determine from an extended study 
of mounted specimens. No attempt is made to account for the 
apparent discrepancy in regard to the color of the body after 
boiling in caustic potash, as given in the original description, 
although a possible explanation might be that the two species are 
really different, but that we had received two lots of the same 
species with different names attached. In the absence of any 
confirmation of this hypothesis it is only possible to place the 
second one described in the synonymy along with Green’s 
D. crotonis. 
