478 



larva with functional legs. The final stage is dull reddish, the 

 integument is finely pubescent, and there are six short func- 

 tional legs. If a single seed is insufficient to nourish the larva 

 it can enter and feed upon others. When the larva is full fed 

 the seed is usually too small to form a comfortable pupal cell 

 and it emerges part way or entirely from it and prepares for 

 the emergence of the adult by scraping away a circular patch 

 on the pod until only a thin membrane remains, and spins an 

 oval cocoon of a coarse, silk-like substance usually attaching 

 the scrapings produced in making preparations for emer- 

 gence to the edges of the opening in the seed and spinning the 

 cocoon partly within the seed. 



Bruchid Parasites in Hawaii 



Uscana sc mifum ipennis. * 



At the time of my arrival in the Islands in 1913 Caryo- 

 honis gonagra was one of the most abundant insects coming to 

 light but its numbers have become much less, probably on 

 account of the accidental introduction of the Trichogrammatid 

 egg parasite Uscana semifumipennis. This has been supposed 

 to have been introduced from Texas in 1909-10 in some work 

 done by Mr. Fullaway in co-operation with the Federal 

 Bureau of Entomology, but this need not be the case, since it 

 can hardly reach the concealed eggs of B. prosopis. It is quite 

 likely that it entered with some other Bruchid such as Bruchus 

 chinensis or some species which has not become established and 

 from our experience with larger and more conspicuous species 

 it could have been present for a long time without attracting 

 attention. It was first discovered by Mr. Fullaway in the 

 latter part of 1910 and by 1912 he found it parasitizing 

 about 25% of the eggs of Caryoborus gonagra on the pods of 

 Prosopis juJiflora. At the present time it seems to be even 

 more effective since the examination of about six hundred eggs 

 in two lots from different parts of Honolulu of similar material 



Girault, Trans. Am. Ent. Soc, 37, p. 23, 191 1. 



