319 
Black Jack Oak (Q, nigra), White Oak (Q. alba), (Q. maerocarpa, Q, 
prinus, and Q. castanea. I have not had opportunity to examine any 
considerable number of the acorns of the four last-named species, but 
such as I have seen show the work of the same insects as infest the 
others, of which I have had an almost unlimited quantity. 
The following tables will be found approximately representative of 
the proportion of acorns destroyed by the different insects feeding 
upon them: 
Post Oak ( Q. stellata) acorns 100 
Infested with Balaninus quercus and uniformis 60 
Melissopus latiferreana 28 
Sound nuts & 
Shrunken or mildewed nuts 4 
Infested by Gelechia following Balanmus 25 
Melissopus 5 
Black Oak ( Q. tinctoria) acorns 100 
Infested with Balaninus 70 
Melissopus 20 
Cynipid galls 5 
Sound nuts 5 
Infested by Gelechia following Balaninus 30 
Melissopus 6 
Laurel Oak ( Q. imbricaria) acorns 100 
Infested by Balaninus 63 
Melissopus 24 
Sound nuts 13 
Infested by Gelechia following Balaninus 14 
Melissopus 9 
Pin Oak ( Q. palustris) acorns 100 
Infested by Balaninus 25 
Melissopus 10 
Sound nuts 65 
Have not found Gelechia in nuts of this species. 
Black Jack Oak ( Q. nigra) acorns 100 
Infested by Balaninus 35 
Melissopus 50 
Sound nuts 15 
Gelechia following Balaninus 15 
Melissopus 20 
From these records it will be seen that the acorns of Pin Oak suffer 
least from the attacks of insects, that the Black Jack is most sub- 
ject to the Acorn Codling, and that the Black Oak (Q. tinctoria) acorns 
are the only ones of which any appreciable percentage are, in this local- 
ity, infested with the Cynipid galls. 
Ln the preparation of these memoranda the life histories of most of 
the species have been more or less completely worked out, and such 
biological facts and descriptions as have not heretofore been published 
may be perhaps not inappropriately recorded in this connection. 
The acorn-feeding species of Balaninus {B. uniformis Lee. and B. 
quercus Horn) may be taken here, out of doors, as early as the first of 
