THE COCCIDAE 



. Pygidium with median pair of lobes distinctly broader than 



long. 



f. Pygidium with genacerores arranged 18-36(31-47) 28-39. 

 g. Pygidium with median pair of lobes strongly oblique, 

 adjacent only for short distance at proximal end, 

 divergent, entire, bluntly pointed at caudal end; sec- 

 ond pair of lobes incised, mesal lobelet largest, each 

 bluntly pointed; third pair of lobes smaller than sec- 

 ond, incised, mesal lobelet largest; plates about 

 twice as long as lobes, arranged 0, 1-2, 1-2, 5-6, those 

 of each lateris arranged 1-1- (1-1-1-1) ; dorsal oracera- 

 tubae conspicuous, arranged in rows; altaceratubae 

 opening in latadentes, 7 on each side; anus about its 

 width cephalad of vulva; spiracerores conspicuous; 

 genacerores 18-21(33-47)31-39. Ceylon on Panicum, 

 Ischaemum, Ophismenus, other grasses, herbae Green. 



gg- Pygidium with median pair of lobes not strongly 

 oblique, mesal margins adjacent for proximal half of 

 length, broad, short, broadly rounded, entire or 

 faintly serrate; second pair of lobes large, incised, 

 mesal lobelet twice as large as lateral, margins 

 broadly rounded, entire or faintly serrate; third pair 

 of lobes distinct, incised, mesal lobelet larger than 

 lateral, both broader than long, margins broadly 

 rounded, entire or faintly serrate; plates long and 

 slender, arranged 0, 1, 1-2, 7-11, those of each lateris 

 arranged Ior2-lor3-5or6 ; dorsal oraceratubae con- 

 spicuous, arranged in rows; genacerores 21-36(31- 

 45)28-32. United States, Canada on willow, poplar, 



Cornus, Amelanchier, Ceanothus, Liriodendron 



salicis-nigrae Walsh. 



ff. Pygidium with genacerores arranged 7-16(11-32)7-22. 

 g. Pygidium with genacerores arranged 2-7(7-11)6-13, 

 usually about 4-4(10-10)6-8; median pair of lobes 

 spatuliform, adjacent, scarcely divergent, entire; 

 second pair of lobes incised, mesal lobelet like 

 median, lateral smaller; third pair of lobes incised, 

 mesal lobelet broad, notched, oblique, margin round- 

 ed, rudimentary, lateral lobelet similar, small; 

 plates of second incisurae one-half length of median 

 pair of lobes, others longer, arranged 0, 1, 1, 5, those 

 of each lateris arranged 1-1-3, one and one-half times 

 length of caudal plates; lateres with prominent 

 latadentes. Austria on Pinus austriaca Lindgr. 



gg- Pygidium with at least some of groups of genacerores 

 more numerous than 7(10)8. 



h. Pygidium with second row of brevaceratubae 

 wanting, lateral group sometimes represented by 

 about two pores, third and fourth rows repre- 

 sented; median pair of lobes well developed, en- 



