OF THE FAMILY COCCIDAK [63 



Vestigial dorsal part of midcranial ridge present on anterior margin of head ; with 

 1 1-2 1 (average 16) fleshy setae between and behind ventral simple eyes ; 4th 

 antennal segment with 23-29 (average 26) fleshy setae ; with 2-4 (average 3-2) 

 coxal bristles ; abdominal segment VII ventrally with 6-1 1 (average 9-2) fleshy 

 setae ; aedeagus short, basal rod about 2 times longer and penial sheath 

 41-4-9 (average 45) times longer ...... Ceroplastes sp. 



Dorsal part of midcranial ridge absent ; with 5-9 (average 71) fleshy setae between 

 and behind ventral simple eyes ; 4th antennal segment with 11- iq (average 15) 

 fleshy setae ; coxal bristles absent ; abdominal segment VII witli 1 5 (average 3) 

 fleshy setae ; aedeagus medium-sized, about as long as basal rod, and penial 

 sheath 3-0-3-4 (average 32) times longer . . . . . C. berliniae Hall 



1'ost-tergital setae absent ; hind tarsus usually with more hair-like than fleshy setae; 

 tergites between abdominal segments I and II consisting of a small sclerite on each 

 side ; abdominal segment VIII laterally with a papilla-shaped caudal extension, 

 which carries a small cicatrix laterally . . . PARTHENOLECANIUM 4 



Post-tergital setae present on at least one side ; hind tarsus with more fleshy than 

 hair-like setae ; tergites between abdominal segments I and 1 1 consisting of a 

 small sclerite on each side and a separate median sclerite ; abdominal segment 

 VIII with a geniculate or mammillate caudal extension which carries a large 

 posterior and small lateral cicatrix respectivelv ...... 5 



Usually with a pair of hair-like medial pronotal setae ; ventral foramen of scutellum 

 large, length usually more than half that of scutellum ; caudal extension of ab- 

 dominal segment VII with 4-8 (average 5) fleshy setae. 



Parthenolecanium pomeranicum (Kaw.) 



Usually without hair-like medial pronotal setae ; ventral foramen of scutellum 

 small, length usually less than half that of scutellum ; caudal extension of 

 abdominal segment VII with 11-25 fleshy setae. Parthenolecanium corni (Bouche) 



Vestigial dorsal part of midcranial ridge present ; distal part of terminal antennal 

 segment not constricted ; mesoprephragma with a shallow emargination ; fleshv 

 scutal setae absent ; femora of medium length, hind femur 3-86-4-75 times 

 longer than wide ; lateral margin of abdominal segment VIII with a mammillate 

 caudal extension which carries a very small cicatrix laterally ; a few fleshy ante- 

 anal setae usually present (range 0-7) ; length of basal rod about equal to ij 

 times that of aedeagus PULVINARIA 6 



Dorsal part of midcranial ridge absent ; distal part of terminal antennal segment 

 somewhat constricted ; mesoprephragma with deep emargination ; with 7-32 

 fleshy scutal setae ; femora long and narrow, hind femur 5-98-6-71 times longer 

 than wide ; lateral margin of abdominal segment VII 1 with a geniculate or 

 cylindrical caudal extension which carries a large cicatrix posteriorly ; fleshy 

 ante-anal setae absent ; length of basal rod more than i^ times that of aedeagus . 7 



The two shortest antennal bristles on the terminal antennal segment about half as 

 long as the fleshy setae ; pedicel, gena and mesoprescutum distinctly polygonally 

 reticulated ; abdominal segment II usually with one or more (range 0-6) hair- 

 like setae ventrally ....... Pulvinaria ?betulae (L.) 



The two shortest antennal bristles on the terminal antennal segment longer and 

 thicker than the fleshy setae ; reticulation on pedicel, gena and mesoprescutum 

 absent or very weak ; abdominal segment II ventrally without hair-like setae. 



Pulvinaria acericola (Walsh & Riley) 



With 10-22 (average 16) fleshy dorsal head setae ; 4th antennal segment 9-1 1 

 (average 10) times longer than wide ; length of 2 shortest antennal bristles about 

 equal that of the fleshy setae ; presternum not reticulated ; with 2-9 (average 

 54) fleshy basisternal setae ; abdominal segment VIII with a geniculate caudal 

 extension ; setae of glandular pouch with external part about 2-2I- times as long 



