THE PEA AND BEAN WEEVILS. 



L237 



B. discoicleus Say, length 8-4.5 mm., is recorded from Ohio, 

 Kansas and Colorado. 



Group A. 



KEY TO SPECIES OF GROUP A. 



a. Hind femur with ;i tooth on both inner and outer margins; thai on 

 inner side larger. 



h. Median basal thoracic lobe with elevated ivory-like space. ( Fig. 

 555.) CHINENSIS. 

 1)1). Median basal lobe with whitish hairs only. (Fig. 557.) 



QUADRIMACULATUS. 



aa. Hind femur with one tooth only on inner margin. 

 c. Elytra black with red spots on the spaces. 

 d. Suture depressed; elytra each with a red spot on middle which 

 touches the side margins. 2200. bivulneratls. 



dd. Disk of elytra flat, the suture not depressed; elytra more black 

 than rufous, the red spot near outer apical margin. 



CRUENTATUS. 



cc. Elytra wholly black, hind femora and tibiae bicoiored. nt^rinus. 



B. chinensis Linn., antennae of male strongly 

 pectinate, length 3-4 mm., is known as the "cow- 

 pea weevil," as it lives in seeds of cow-peas, beans, 

 etc. B. quadrimaciilatus Fab., longer, less robust, 

 with broader thorax, black with gray and white 

 pubescence, length 3-4.5 mm., is known as the 

 "four-spotted bean weevil,*' and also lives mainly 

 in cow-peas. Both are widely distributed, have 

 been introduced in seeds and are likely to occur 



anv place in Indiana. rimaculatus Fab. Icnale 



(After Chittenden.) 



2290 (7128). Bruchus bivulneratus Horn, Trans. Amer. Ent. Soc, IV, 

 1873, 325. 



Oval, robust. Black, feebly shining ; elytra each with a large red spot 

 at middle which reaches the margin but not the suture. Head elongate- 

 oval, densely punctured. Antennas as long as head and thorax, the three 

 basal joints reddish. Thorax shining, one-half broader at base than long, 

 sides feebly curved and gradually narrowed to apex, base lobed at middle, 

 surface densely and rather coarsely punctured. Elytra as broad as long, 

 deeply striate; intervals flat, densely and rugosely punctate. Length 3- 

 3.5 mm. 



Southern two-thirds of State; frequent, May 15-October 14. 

 Occurs on flowers of milkweed and white snakeroot {Eupatorium ). 

 The larva? are said to breed in the seeds of wild senna {Cassia mari- 

 landica L.) . 



