THE COCCIDAE 



f. Pygidium always with densariae. 



g. Pygidium of adult female with three pairs of lobes. 



Furcaspis Lindgr. 



gg- Pygidium of adult female with less than three pairs 

 of lobes, 

 h. Pygidium with two pairs of lobes. Type, Aspidio- 



tus ostreaeformis Curtis Quadrasindiotus MacG. 



hh. Pygidium with single pair of lobes 



Diaspidiotus Leon, 

 ff. Pygidium always with paraphyses. 



g. Pygidium always with four or five groups of gena- 

 cerores. 



h. Scale of adult female circular or nearly so, exuviae 

 superimposed one above the other, situated at or 

 near middle of scale; pygidium with anus fre- 

 quently nearer caudal margin than postgenacerores. 

 Chrysomphalus Ashm. 



hh. Scale of adult female elongate and narrow, two or 

 three times as long as broad, sides parallel or sub- 

 parallel, exuviae superimposed one above the other 

 and situated at or near one end of scale; pygidium 



with anus located between postgenacerores 



Pseudischnaspis Hemp. 



gg- Pygidium never with more than two groups of gena- 

 cerores, one on each side of vulva. Type, Melanaspis 



samoana Lindgr. Lindingaspis MacG. 



dd. Pygidium of adult female without pectinae or plates. 

 e. Pygidium always without paraphyses. 



f. Pygidium with four to six groups of genacerores. 



g. Pygidium always with densariae; genacerores in 

 four or five groups, 

 h. Pygidium with two pairs of lobes. Type, Aspidi- 



otus forbesi Johns Forbesaspis MacG. 



hh. Pygidium with single pair of lobes. Type, Aspidi- 



otus covilleae Ferris Ferrisaspis MacG. 



gg- Pygidium never with densariae; genacerores in five 

 or six groups; projections and mesal indentation 



present, lobes lacking. Comstockiella Ckll. 



ff. Pygidium with three groups of genacerores or with 

 three groups fused into single inverted U-shaped group. 

 Type, Odonaspis janeirensis Hemp.__LigwZaspis MacG. 

 ee. Pygidium always with distinct paraphyses. 



f. Pygidium with two large distinct groups of genacerores; 

 lateres with lobe-like prolongations, caudal end rounded, 

 two pairs of indentations continued as paraphyses; anus 



about midway between vulva and caudal margin 



Odonaspis Leon. 



