110 THE CANADIAN ENTOMOLOGIST 



between the Monophlebinae and the Margarodinae on the basis of the presence 

 or absence of the mouth-parts in the adult female cannot be maintained. 



Xylococcus betulae Perg. 



1898. Xylococcus hetulce Pergande, U. S. Dept. Agric, Div. Ent., Bull. 

 18, n. s., p. 18. 



1917. Xylococcus alni Florence, Ann. Ent. Soc. Am., vol. 10, p. 158. 



There is, I think, no question that these two species are identical. I have 

 at hand the types of X. alni and specimens of X. betulcB as follows: from "cherry 

 birch," Port Colborne, Ontario, Canada, adult female, intermediate stages and 

 larva; from beech, Ithaca, N.Y., intermediate stages; from beech, Michigan, 

 adult female, intermediate stages and larva. 



The characters used by Miss Florence for the separation of X. alni are hardly 

 sufficient. The differences in the anal tube of the apodous stages are not con- 

 stant. The first larval stage of alni (in the two specimens examined) has 6-7 

 median ventral pores and the first stage of betula (in numerous specimens) has 

 but 5, but in all other respects the two are identical. 



Whether X. querciis is distinct is questionable. There appear to be certain 

 differences in the first stage, but if these differences be allowed as of specific 

 value it will be necessary to name another species for specimens taken from 

 Quercus californicns. More material is desirable before forming any con- 

 clusions. 



X. fflacrocarpce Coleman is very distinct. I would separate this from 

 X. betulce by the following characters: 



Adult female with the derm of the dorsum practically destitute of 

 spines; anal tube of apodous stages with pores at the inner end 

 only ; marginal pores of first stage sessile, X. macrocarpcE Coleman. 



Adult female of the dorsum everywhere quite thickly beset with slender 

 spines; anal tube of apodous stages with pores both at the inner 

 end and near the base; marginal pores of first stage borne at the 

 inner end of short ducts X. betulce Pergande. 



Genus Kuwania Ckll. 



1903. Fernald, Cat. Coccidae, p. 30. 



1909. Cockerell, Can. Ent., vol. 41, p. 56. 



Monophleboid Coccidffi in which the adult female appears normally to 

 lack mouth-parts but with the legs and antennae present; tarsal claw without 

 digitules, the tibia with numerous digitule-like hairs on the inner side at its apex; 

 intermediate stages without legs and with the antennae reduced to mere chitin- 

 ized points, anal tube lacking. Four pairs of abdominal spiracles present in 

 adult and penultimate stages, these on the anterior segments of the abdomen. 



Type of the genus Ktiwania quercus (Kuwana). 



Notes. — I am inclined to doubt that K. zeylanica (Green) is congeneric 

 with K. quercus. The immature stages have not been described, and it is 

 upon these that the matter will largely depend, the adults of all of these forms 

 being quite similar. I have at hand an adult female of K. zeylanica which differs 

 from the same stage of K. quercus in having well-developed mouth-parts with a 

 distinct mentum, and in having 6-8 pairs of abdominal spiracles. 



