22 BULLETIN 843, U. S. DEPARTMENT OF AGRICULTURE. 



There is no definite place in the life history of this species to 

 separate the different broods. Apparently there are two broods or at 

 least a partial small second brood for this locality. The fact that 

 larva? were observed in all stages of development during the entire 

 season would suggest two broods. Further, the fact that first-brood 

 adults began issuing rather late, and that so few egg clusters were 

 found in late August and September, would -suggest only a partial 

 second brood. 



SXTMMARY FOK 1019. 



Hibernating adults appeared ■ June 16. 



Beetles present in large numbers by June 25. 



Beetles began depositing eggs June 25. 



Eggs began hatching July 10. 



Larva? began to transform to pupae July 22. 



Adults of first generation issued July 28. 



lAugust 28. 

 Egg clusters, second brood, found (September 2. 



Maximum numbers first-brood adults observed September 1. 



Adults began to become sluggish September 10. 



Maximum damage accomplished August 1 to September 1. 



Second-brood eggs were probably deposited, but not observed, before August 28. 



INJURY. 



The bean ladybird so far as observed confines its feeding to beans, 

 and when taken on other plants is never found feeding. The 

 variety of beans seems to make no particular difference as to sus- 

 ceptibility to attack. The adults do not attack the very young 

 plants to any considerable extent. This fact is probably due to the 

 small number of hibernating individuals. Furthermore, the over- 

 wintering adults do not concentrate their attack, but move from plant 

 to plant. Thus the damage is less noticeable. Although the adults 

 usually eat entirely through the leaf, they often merely scrape the 

 surface, leaving a network of veins plainly visible. Later in the 

 season as the foliage begins to die they attack the pods, sometimes 

 completely riddling them, but usually eating out small spherical 

 holes here and there along the pod. In the case of canning beans 

 this injury may cause considerable loss, while on seed beans it is not 

 so serious. 



The percentage of injury by a number of adults is small as com- 

 pared to that caused by an equal number of larva?. The larvae begin 

 their attack on the leaves, invaribly feeding at first on the underside. 

 Instead of eating through they scrape the surface, leaving the skele- 

 ton of the leaf in plain view, although with continued feeding in a 

 limited space they may riddle the foliage. 



Maximum damage occurred in this locality during the month of 

 August. This is the period when the new adults are feeding along 



