26 



ENTOMOLOGICAL SOCIETY OF ONTARIO. 



oft leaves and twigs near the edge of Cranberry Lake, in the County of Oxford. (A box 

 containing twenty or thirty olive-colored flies killed by this fungus was passed round 1 

 for examination.) 



Fig. 14. 



Fig 15. 



Fig 17. 



Fig 18. 



Figs. 14 and 16. — Conidiophores forming white rings between the segments of the abdomen. Highly- 

 enlarged. 



Figs. 15 and 17. — Primary and secondary conidia which form the smoky halo seen round the fly- 

 adhering to the pane of glass. Highly enlarged. 



Fig. 18. — Conidiophores of Isaria farinosa slightly enlarged. 



Another fungus, or stage of a fungus, doubtless quite common though not frequently 

 observed, bears the name Isaria. These specimens which I have here grew upon pupa-, 

 probably of Arctiids, and are labeled Isaria farinosa, Fr. They are supposed to be a stage 

 of Cordyceps. Out of the insect grew these conspicuous sporophores, \ to | inch long, 

 orange at base but covered when fresh for two-thirds of their upper part by a white 

 dusty layer of spores which arise from the ends of the threads forming the sporophore. 

 At Cornell, spores from a potato culture of this fungus were painted on the ventral side 

 of seven " woolly-bear " caterpillars ; in twenty days the fungus had attacked all but 

 two of them, and in another month one of them had developed showy sporophores like, 

 that from which the culture had been taken. 



Fig. 19. Fig. 20. 



Fig. 19.— -A thread of Sporotrichum globulifcrum bearing spores greatly enlarged. 

 Fig. 20.— A thread of Isaria bearing spores separated from the compact sporophore. 

 enlarged . 



Greatly 



The fungus which has been used for infection experiments with the chinch-bug is 

 known as Sporotrichum globulU erum. Tt was first found on Carabidte and is some- 

 what like Isaria in its method of growth. " Instead of the filamentb being compacted into 

 sporophores they envelop their hosts in a loose white cottony swathing. (An example 

 of sporotrichum on a beetle was exhibited, also larvre bearing Isaria). 



