284 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



FIG. 242. The cow-pea weevil (Bruchus chi- 

 nensis L.): a, adult male; 6, egg; c, young 

 larva; d, front view of head of same; e, thor- 

 acic leg of same; a, much enlarged; 6, e, 

 more enlarged. (After Chittenden, U. S. 

 Dept. Agr.) 



Other Bean- weevils 



The Cow-pea weevil.* This species may be readily recognized 

 by the two large, raised white lobes at the base of the thorax and 



the strongly pectinate 

 antennae of the male as 

 shown in Fig. 242, a. The 

 cow-pea is the favorite 

 food-plant of this and the 

 following species, but peas 

 and various sorts of beans 

 are also attacked. This 

 species is a southern form, 

 but seems to be spreading, 

 incident to the more wide- 

 spread growth of the cow- 

 pea. Like the common 

 bean-weevil it is practically cosmopolitan in its distribution, but 

 is most injurious in tropical regions. The life history and remedial 

 measures are practically the same as for the common bean- weevil. 

 The Four-Spotted Bean-weevil. fThe wing covers of this species 

 are covered with gray -r j 



and white pubescence ^ 



and four darker spots 

 from which the spe- 

 cies is named. It is 

 more slender than the 

 preceding species and 

 the antennae of the 

 male are not pecti- 

 nate. The markings 

 are quite variable, 

 but the most com- 

 mon form is that shown in Fig. 244. This is an exotic species oc- 

 curring from Mexico to Brazil and in the Mediterranean countries. 

 In 1885 it was found at the Atlanta Cotton Exposition in black- 

 eyed beans from Texas, and has since become acclimated as far 



north as Iowa. It seems to breed more readily in fresh and slightly 

 * Bruchus chinensis Linn, 

 f Bruchus quadrimaculaius Fab. 



FIG. 243. The four-spotted bean-weevil : a, beetle; 

 6, larva; c, pupa all enlarged. (After Chit- 

 tenden, U. S. Dept. Agr.) 



