477 



Several varieties showed infestation, among them Mani calico, 

 the Maui red, and small white navj beans. All those exam- 

 ined which showed infestation had been oviposited npon while 

 in storage, as was to be seen from the presence of the eggs 

 npon them. In most cases several eggs, from five to ten, and 

 in one case as many as twentj-four, may be laid on a single 

 bean. The eggs are cemented to the bean, much flattened, 

 and nearly circular in outline. As many as 13 adults have 

 been bred from a single mottled bean 10|l6 by 5|l6 in. in 

 length and breadth, and six from a small white bean only 5|l6 

 by 3 1 16 in. Examination of 102 mottled beans naturally in- 

 fested gave an average of 4.77 beetles emerging from each bean. 

 The species is speedily destructive to the beans, more so than 

 Bruchus ohtectus. Mr. Cowan, who had noticed this species 

 as different from the common bean-weevil, observed it first dur- 

 ing 1917. 



If, as I have supposed it may be, this species is the species 

 called the Mexican bean weevil by Chittenden, S pernio pliagus 

 (Zabrotes) pedomlis Sharp, it has previously been bred from 

 beans and cowpeas. I have been able to breed it experimentally 

 from Phaseolus vulgaris, P. limatus, P. articulatus, P. acuti- 

 folius, Vigna chinensis, Cajanm indicus, Glycine liispida, Cicer 

 arietinum, and Pisum sativum. 



Caryohorus gonagra. 



This weevil breeds in the seeds of several trees and shrubs, 

 among them Tamarindus indicus, Cassia nodosa. Cassia fistula. 

 Cassia grandis. Acacia farnesiana, Prosopis juliflora, Bauhinia 

 tomentosa, BauJiinia monandra, and Caesalpinia pulcJierrima. 



The eggs are laid indiscriminately on the pods of its host- 

 plants, sometimes also on the seeds and frequently in other 

 places w^here the larva has no chance whatever of finding food. 

 It is remarkable that the newly hatched larva can find its 

 way through the dense tissues of the pods and the hard seed 

 coats imless it finds some food in the material penetrated. 

 The larval stage passed within the seed resembles a Bruchus 



