172 
has found the same parasite upon Cleonus punctiventris , Germ. The 
insects that are so formidable to beet growers of southern Kussia may 
then be effectually combatted by three fungi; the green muscardine 
(Isaria destructor , Metscli.), the red muscardine (Sorosporella uvella , 
Krassil.), and the white muscardine (Botrytis Bassiana , Bals.). 
Vendhalm and Krassilstschik have also discovered a new species of 
Isaria upon an undetermined Lixus (larva and nymph), an Isaria that 
can undoubtedly be utilized in ridding ourselves of the different Curcu- 
lios that attack the Carduacece. 
But the fungus which Krassilstschik has most thoroughly studied is 
oue which he has met ou the eggs of the migratory locust ( Pachytylus 
migrator ins). This is a conidial form which Krassilstschik believes be¬ 
longs to the Isaria of Cordyceps opliioglossoides , Ehr. & Tul.; this is also, 
it seems, the opinion of Professors Cienkowsky and Keinliardt, who 
have seeu his preparations of the fungus. 
If the Isaria ou locust eggs is really Isaria opliioglossoides we find 
ourselves in the presence of a very curious fact. 
The locust eggs evidently do not supply the fungus with sufficient 
nutriment for the development of the* highest order of reproductive or¬ 
gans—the asci. But how does it happen that in certaiu localities Cor¬ 
dyceps opliioglossoides abandons the eggs of the Acridecc to develop fur¬ 
ther on Elapliomyeesf 
The Elapliomyees are subject to invasions of numerous parasites and 
in particular of the dipterous larvae of the genus Helomyza. Now the 
Diptera of this group are in turn often infested by entomogenous Splueri- 
acece. It seems to me very probable that the Cordyceps parasitic ou 
Elapliomyees lived at first in the Isaria stage upon the larvae of the Dip- 
iera which infested them, and from there extended their mycelium to 
Elapliomyees itself, where, thanks to more abundant nutriment, they 
could produce their asci. It is even possible that this might have oc¬ 
curred during the phylogenetic evolution, and that at present Torru- 
bia opliioglossoides and capitata attack Elapliomyees directly. 
The article concludes with the following direct translation (into 
French) from Krassilstschik’s paper. 
Although De Bury is lately inclined to accept Tulasne’s view that 
Isaria is only the conidial form of Cordyceps , and considers it very prob¬ 
able that Isaria farinosa belongs to the cycle of development of Cordy¬ 
ceps militarise it is necessary to observe that the genus Isaria compre¬ 
hends an enormous number of forms ; and since the union of this genus 
with that of Cordyceps is probable only for oue species, it is useful for 
the time to retain the genus Isaria and to designate each form by a 
special name. 
As to Botrytis Bassiana, De Bary as well as Brefeld formerly consid¬ 
ered it as the conidial form of a Pyrenomycete ( Melanosporaparasitica ); 
he appears, however, to have given up the idea after numerous cultures 
and experiments. 
