THE MONTHLY BULLETIN. 



223 



summer until late fall. The adults hibernate during the colder winter 

 months. 



Distribution. — Throughout the citrus growing sections of the State. 

 It was first introduced by Albert Koebele and is continually being 

 redistributed by the State Insectary. 



Hosts. — Cottony cushion scale {Icerya purchasi) . This species is 

 often more numerous and does greater execution than does the Vedalia 

 {Novius cardinalis) , for which it is usually mistaken. 



BLACK LADYBIRD BEETLE. 



Rhizohius ventralis. Er. 

 (Fig. 222.) 



General Appearance. — The adults are smaller than those of the 

 common red ladj^bird; rather oval in shape; black and covered with 



Fig. 222. — The black ladybird beetle {Rhizohius ventralis Er. ). A, larva; B, pupa; C, 

 ventral aspect of adult; D, dorsal aspect of adult. (Essig, P. C. Jr. Ent. ) 



