SCUTELLEROIDEA—DOUGLAS LAKE REGION 47 
es and willows grow and collecting is usually good in such 
situations. 
During the eight weeks that the Biological Station was open 
in the summer of 1918, the total rainfall was a little under 1.75 
- inches. As a result, much of the vegetation on the exposed 
sand dunes became parched and dry and was deserted by plant- 
feeding bugs. In spite of the somewhat greater amount of pre- 
cipitation in 1920 the vegetation in such situations, especially 
after the middle of July, became hard and dry as during the 
preceding season. 
A large share of the pentatomids mentioned in this paper 
are of transcontinental distribution, but a few of the forms are 
confined principally to northern latitudes. Among these may 
be noted Elasmostethus cruciatus, Meadorus lateralis, Apateticus 
bracteatus and Podisus placidus, all of which, with the excep- 
tion of the first, are not particularly rare in the Douglas Lake 
region. 
Acknowledgement is due the following persons for assistance 
in collecting material: Miss Priscilla Butler, Mr. E. H. Brun- 
quist, Prof. H. C. Fortner, Mr. M. H. Hatch, Mr. H. W. Moss- 
man, Prof. G. R. LaRue, Director of the Biological Station, 
and Mrs. Stoner, who was a constant aid and companion. 
Thanks are also due Dr. J. H. Ehlers, one of the botanists of 
the Station staff, for the identification of most of the plants 
herein mentioned. 
ANNOTATED LIST 
Family Scutelleride 
Subfamily Tetyrine 
Homaemus aeneifrons (Say) 
This is probably the commonest species of Scutelleroidea 
found in the region and a large series of specimens taken at 
frequent intervals during July and August is at hand. The 
time of greatest abundance of the adults seems to be between 
July 20 and August 20. My earliest record for an adult is 
July 4. Several nymphs in third and fourth instars were taken 
up to July 15, but after that date the numbers of immature 
individuals gradually fell off. In my field notes of July 8, 1920, 
the following memorandum occurs: ‘‘Nymphs in third and 
