of the family coccidae 151 



Table 3. List of Characters which mainly Separate Genera 



Characters Eulec- Erio- Coccus 



anium peltis 



Ahdoman — conic/. : 



83. Length of basal rod in relation to length of 



aedeagus. G g os 



84. Basal rod reaching basal membranous area 



or not. G - - 



85. Length of aedeagus in relation to length of 

 penial sheath. g 



86. Length of aedeagus in relation to length of 



basisternum. g s 



COCCUS group : All the genera of this group are very closely related but each 

 has a characteristically shaped caudal extension on abdominal segment VIII. 

 Ceroplastes also differs from the others in the shape of the head. 



INGLISIA group : Only one genus was studied and generic differences can 

 therefore not be discussed. 



ERIOPELTIS group : The two genera Eriopeltis and Liizulaspis are very 

 closely related but Liizulaspis is distinct in lacking the glandular pouch and pores. 



EULECANIUM group. The genera Eulecanium, Nemolecanutm, Physokermes 

 and Rhodococcus are very closely related, but can easily be separated by the number 

 of eyes. Palaeolecanium differs from these genera in possessing a comparatively 

 short penial sheath. Phyllostroma is also rather closely related to these genera but 

 is characterized in lacking halteres and in having the metapleuron reduced. The 

 two genera Ctenochiton and Filippia form a distinct subgroup that can be separated 

 from the aforementioned in having a tubular scutellum and from each other by the 

 number of eyes and the development of the basal rod of the aedeagus. The three 

 remaining genera of the group are all very distinct. Ericerus is characterized by 

 the long, narrow head and the extremely long fleshy setae on the appendages, 

 Genus A by the exceptionally short and thick fleshy setae on the appendages and 

 the possession of a ventral sclerite, whereas Sphaerolccanium is the only genus in 

 this group with a prominent caudal extension on abdominal segment VIII, a basal 

 rod longer than the aedeagus and fleshy prosternal, anterior metasternal and 

 abdominal setae. 



Species. 



In Table 4 the characters are listed which separate species in the four genera in 

 which more than one species were available ; a " X sign indicates the genus in 

 which the character operates. From the table it can be seen that differences 

 between species are not only indicated by differences in the chaetotaxy and 



