86 
several of the smaller species dead, their color changed to 
brick-red. August 16, still more dead and discolored lice. All 
these red specimens killed by an Entomophthora, afterwards 
determined as Entomophthora fresenii. August 20, plant-lice dying 
slowly with Entomophthora, many of them anchored to the corn 
stalk by simple threads. Young as likely to suffer as the old. 
No appearance of Sp >rotrichum in this cage. 
It may be noted in passing that this same Entomophthora was 
found September 4 infesting this plant-louse species on roots of 
Cyperus strigosns growing in a trench in the insectary. 
No. 12. August 7. A field experiment with cultivated 
Sporotrichum globuliferum. Spores of this fungus from a labora¬ 
tory culture were dusted by Mr. Marten over a clusler of chinch- 
bugs in leaves and behind sheaths of corn on the farm of Mr. 
Pontus, near Odin, Illinois. September 7, traces of fungus ma¬ 
terial introduced into this field were still visible on some of the 
stalks. Careful examination by Mr. Marten of the treated stalks 
and of many others in the vicinity, failed to show a single dead 
bug, and indeed not one was found on the entire farm. Mr. 
Charles Ferguson, who assisted in the original treatment of this 
field, says that he examined it, after rains, August 10 and 24, but 
found no dead bugs. 
No. 13. August 7. Field infection experiment like No. 14, on 
the farm of Mr. Charles Ferguson, near Odin. Spores dusted by 
Mr. Marten on bugs clustered behind leaf sheaths of corn. Bugs 
nearly all young. August 10 a slight rain, and August 24 a 
heavy one, the latter wetting ground to a depth of about three inches, 
which was soon dried out, however, by the hot sun. After each 
of these rains the field was examined by Mr. Ferguson, but no 
appearance of fungous infection was detected. September 7, vis¬ 
ited by Mr. Marten, who found no dead bugs on farm. 
No. 14. August 7. Field infection experiment with chinch- 
bugs on the farm of Dr. E. E. Fyke, near Odin, Illinois. Two 
badly infested hills in corn field dusted with cultivated spores of 
Sporotrichum; and in another part of the field, where young bugs 
were excessively abundant on corn and crab-grass, seven hills were 
treated by dusting with spores the bugs behind the leaf sheaths 
of the corn. Bugs mostly young, not having reached the third 
moult. Drouth severe, and damaging the crop. Field examined 
carefully by Dr. Fyke after rains, August 10 and 24, but no ap¬ 
pearance of disease. September 7, visited by Mr. Marten. Some 
of the hills retained the material placed on them a month before, 
but there were no dead bugs in or about any of them. Many 
hills in the vicinity were examined by pulling down leaf sheaths, 
turning over clods, pulling up grass and weeds, and searching all 
places of concealment, but quite without success. Bugs every¬ 
where as abundant as at the preceding visit, August 7. 
No. 15. August 7. Field infection experiment on farm of Mr. 
Arrowsmith, near Odin, Illinois. Bugs behind sheaths of corn 
dusted with spores from artificial culture on corn meal. Septem¬ 
ber 7, slight traces of original infection still visible about some of 
