THE CANADIAN ENTOMOLOGIST 375 



A NEW GENUS AND SPECIES OF COCCID.E. 

 (HEMIP.; HOMO?.). 



BY G. F. FERRIS, STANFORD UNIVERSITY, CALIFORNIA. 



Stomacoccus, new genus. 



Coccidse, referable to the tribe Xylococcini of the subfamily 

 MargarodincB, characterized, as are the other members of the 

 subfamily, by the presence of legs in the first larval stage, the loss 

 of these appendages in succeeding larval stages of the female, at 

 least, and their reappearance in the adult female. Differing from 

 any of the other members of the subfamily by the presence of 

 mouth-parts in the adult female. Intermediate larval stages with- 

 out an anal tube. 



Type of the genus, Stomacoccus platani, n. sp. 



Stomacoccus platani, n. sp. 



Adult female 1.6 mm. long (on slide), of elongate form, with 

 nearly parallel sides. In life of a deep yellow colour, without 

 waxy secretion except for the fluffy, ovisac in which the eggs are 

 placed. AntenncB set close to the extreme anterior margin of the 

 body with their bases nearly or quite touching, seven-segmented, 

 the first segment large and 'stout, the second segment short and 

 broad, the remaining segments becoming successively narrower 

 and longer than the second with the seventh nearly as long as the 

 first. Legs well developed, the anterior pair somewhat stouter 

 than the others. Tarsal claw with at least six knobbed hairs 

 arising near its base. Body apparently with no dorsal seta?, but 

 with a pair of slender setae at the base of each coxa and a median 

 pair of such seta on each ventral segment of the abdomen. Pores 

 of wax-glands relatively few, concentrated toward the posterior 

 end of the body, simple, surrounded by a chitinous ring. Anal 

 opening on the dorsum of the last abdominal segment, very small, 

 surrounded by a simple, chitinous ring. Eight pairs of spiracles 

 present, two on the thorax and one on each of the first six abdominal 

 segments. 



Larva at first with legs and antennae, the latter five-segmented, 

 then losing these appendages and assuming a regularly oval form 

 having much the appearance of some insect's egg. In life, of a 



November, 1917 



