54 NINETEENTH REPORT STATE ENTOMOLOGIST OF MINNESOTA—1I922 
mens from the state. This would indicate that the species is still rather 
scarce, or perhaps the collectors have neglected to look in potato fields. 
In his annotated list of the Pentatomidae, Van Duzee (1904) re- 
corded Perillus. bioculatus from New Mexico, Colorado, Kansas, Ne- 
vada, Idaho, and Montana. 
Pettit (1908) reported Perillus bioculatus from Michigan and gave 
the following note: A predaceous bug “appeared during the summer 
of 1907 in potato fields all over the state and did noble service in kill- 
ing off the potato beetles. These bugs were seen to be repeatedly 
piercing the larvae of the beetles and sucking them dry. Indeed, we 
were told by some farmers that this work was so effective on certain 
farms as to make it unnecessary to spray for the | potato] bugs.” 
Chittenden (1911) published a note in which he states: “Perillus 
bioculatus, a predaceous bug, was reported by Mr. D. H. Shannon, 
Appleton, Wisconsin, as having been noted killing the Colorado potato 
beetle in August, 1908.” 
Bethune (1911) reports as follows: “A very remarkable occurrence 
of predaceous bugs has taken place in Southwestern Ontario during 
the last few weeks. Correspondents in the counties of Dufferin, 
Norfolk, Oxford, and Middlesex have sent in specimens of Perillus 
bioculatus Fabr., and of its variety, claudus Say. The latter form was 
described and figured in the Second Annual Report of the Entomological 
Society of Ontario, published in 1871, under the name of Perillus 
circumcinctus. These bugs, both in the imago and nymphal forms, are 
destroying the Colorado potato beetles, both eggs, larvae, and mature 
beetles, to such an extent that in some fields it is reported that hardly 
any of the beetles are to be found, though the plants have not been 
sprayed. They are quite abundant also at the College in Guelph and 
other parts of the County of Wellington. The specimens have been 
kindly identified by Mr. E. P. Van Duzee. He expresses surprise at 
the species being found in this part of Ontario, as he considers it a 
southern form, and is rarely known to be found as far north as the 
State of Illinois.” The present writer is inclined to believe that the 
early record mentioned above (1871) really applied to Perillus cicum- 
cinctus as we know it now, a species which is sometimes found feeding 
on the potato beetle but never in abundance. 
Yothers (1911), in speaking of the article by Dr. Bethune, reports 
as follows: “I also am glad to report the good work of this insect 
in Michigan during the years 1908 and 1909. In 1908 it was sent in 
to the Michigan Agricultural College several times, and each time 
mentioned as killing the potato beetle. In 1g09 it was sent in quite 
frequently, and from many localities. Several of the correspondents 
