62 MANUAL OF VEGETABLE-GARDEN INJECTS 



black at the base and on each there is a large dark spot at the 

 middle of the outer margin and another at the tip. The ex- 

 posed tip of the abdomen is brownish, usually marked with 

 two black spots. The antenna? are black, reddish brown at 

 the base. The legs are brownish except the basal two thirds 

 of the hind femora which is black. 



Under cage conditions, the beetles have been observed to 

 deposit their eggs singly on bean pods. The egg is oval, 

 lemon-yellow and about -i^ inch long by 

 eV ii^ch wide. It is attached to the pod 

 by a thin sheet of gelatinous substance 

 which extends beyond the egg. Under cage 

 conditions in New York, it required fifty 

 days for the eggs to hatch. When breed- 

 ing in dry beans, the eggs are glued to the 

 surface of the seed and hatch in thirteen 

 Fig. 45. — The four- ^^ twenty days. On hatching, the young 

 spotted bean weevil larva bores directly through the pod 

 and attacks the seeds within, or when 

 the eggs are attached to the seed, it enters directly under 

 the egg-shell. The young larva closely resembles that 

 of the pea wee\'il but differs in the armature of the pro- 

 thorax. The full-grown larva is very similar to that of the 

 bean weevil from which it may be distinguished by the larger 

 area of black on the head just above the clypeus. The larva 

 also injures beans in much the same way as the bean weevil. 

 Pupation occurs within the seed. The rate of development 

 varies considerably with the temperature and moisture. Several 

 larvae may infest the same seed and successive generations may 

 be produced until the food supply is exhausted. 



References 



Slingerland, Psyche, 6, pp. 447-449. 1893. 



Chittenden, U. S. Dept. Agr. Yearbook for 1898, pp. 245-248. 



