THE MONTHLY BULLETIN. 



211 



THE TWO-STABBED LADYBIRD BEETLE. 



Ohilocoriis bivulnerus Muls. 

 (Fig. 202.) 



General Appearance. — The adults are broadly oval and about three 

 sixteenths of an inch long. The 

 color is shiny black with two round 

 blood-red spots upon the elytra. 

 The extreme margins of the pro- 

 thorax are pale. The under side of 

 the abdomen is red. The larvffi are 

 very shiny, dark in color, with a 

 yellow transverse band across the 

 middle. 



Distribution. — This is one of the 

 native ladybird beetles and is to be 

 found in almost every part of the 

 State. 



Hosts. — The larvae and adults are voracious feeders upon the San 

 Jose scale {Aspidiotus perniciosns), young of the black scale {Sms- 

 setia olece), mealy bugs {Pseudococcus citri and P. longispinus) , oyster 

 shell scale (Lepidosaphes tilnii) , European elm scale (Gossyparia 

 spuria) and other scale insects. 



Fig. 202. — The two-stabbed ladybird 

 beetle, Chilocorus bivulnerus Muls. 

 (Original. Drawing by Blrdnekoff. ) 



THE STEEL-BLUE LADYBIRD BEETLE. 



Orcus chahjheus (Boisd.). 

 (Fig. 203.) 



General Appearance. — The adults of this beetle are metallic steel- 

 blue or green in color, almost hemispherical in 

 shape and between one eighth and three eighths 

 of an inch in diameter. The head of the male is 

 yellow. 



Distribution. — Originally distributed through- 

 out the entire southern part of the State, but is 

 now almost entirely confined to the districts 

 around Carpinteria in Santa Barbara County, 

 where it is well established. Introduced into 

 California by Albert Kcebele. 



Hosts. — Feeds upon many armored coccids, 

 including red scale {Chrysomphalus aurantii), 

 yellow scale {Ghrysomphalus citrinus) , Chrysom- 

 phalus rossi, purple scale {Lepidosaphes heckii), 

 San Jose scale {Aspidiotus perniciosus) and black scale {Saissetia 

 olece). 



Fig. 203. — The steel- 

 blue ladybird beetle, 

 Orcus chalybeus 

 (Boisd.). Top natural 

 size. (Agrcl. Gaz. N. 

 S. W.) 



