146 THE COCCIDAE 



SPECIES OF ANTONIA 



a. Anal ring located at cephalic end of invaginated anal tube; an- 

 tennae of adult female consisting of three segments; caudal end of 

 abdomen usually strongly chitinized. 



b. Abdomen with caudal end not strongly chitinized or not decided- 

 ly more strongly chitinized than adjacent parts; adult female 

 about three times as long as broad; metathoracic spiracles located 

 near middle of length of body, mesothoracic spiracles midway 

 between metathoracic spiracles and antennae, and rostrum mid- 

 way between mesothoracic spiracles and antennae; spiracles with 

 group of about twenty-five closely placed cerores adjacent to their 

 lateral margin; anal lobes wanting; caudal end of body on each 

 side of anal tube with three long setae. England on recently im- 

 ported plants of Arundinaria japonica. socialis Newst. 



bb. Abdomen with caudal end strongly chitinized on ventral or both 



dorsal and ventral aspects. 



c. Adult female, untreated, oval in form and cream-colored; 

 caudal portion of abdomen strongly chitinized on ventral as- 

 pect and dark in color; abdomen on caudal segments bearing 

 numerous small slender setae; spiracles surrounded on lateral 

 margin by crescentic-shaped group of cerores; first stage 

 nymph with transverse row of short conical setae on middle 



of each segment. Kansas on Bouteloua boutelouae Parr. 



cc. Adult female, untreated, oval or circular in outline and deep 

 purplish-red in color; caudal portion of abdomen quite heavily 

 chitinized and bearing numerous short, spine-like setae, other 

 portions of body with only few setae at margin, first stage 

 nymphs with group of two or three short setae at lateral mar- 

 gin of each of three last abdominal segments. Japan, Californ- 

 ia on bamboo crawii Ckll. 



aa. Anal ring not located at cephalic end of invaginated anal tube; 

 antennae consisting of three to five segments; caudal end of abdomen 

 not strongly chitinized. 



b. Antennae short, with four or five segments, the two proximal seg- 

 ments are usually about the same width and distal segments 

 taper sharply; prothoracic legs sometimes present; body with few 

 short setae, more numerous on caudal portion; spiracles with 

 crescentric group of about forty closely placed cerores, situated 

 near lateral margin of spiracle. Kansas on Eragrostis, Bulbilis, 



Paspalum. parrotti Ckll. 



lib. Antennae aborted, never with more than three segments. 



c. Body, exclusive of caudal segment, bearing large number of 

 setae; spiracles colored and accompanied by abundant punctu- 

 ation. France on stubble and roots of certain Graminaceae, 



principally Milium, Agropyrum. purpurea Sign. 



ec. Body not bearing large number of setae; adult female oval, 

 plump, cream-colored, with slight tinge of brown on margin; 

 spiracles on lateral margin with crescentic group of closely 

 placed rather large cerores; anal orifice situated in slight de- 



