Abstract
During the summer of 1940, Dr. Ketzelman and Dr. Grundaman<sup>1</sup>of Kansas State College made a collection of assassin bugs (Microtonus purcis) in a pasture where horses had died of western equine encephalitis. They found that 50 per cent of the collection were infected with virulent western equine virus. In 1941 collections were again made in different pastures with the same results. The assassin bug is found mainly in pastures along rocks or ledges. It is a semitropical bug which is supposed to have migrated to North America but is now considered fairly common throughout the Middle West. This bug lives on blood from animals or man. It mates and hibernates after frost and lays its offspring along rodent nests so that the young may feed on the rodents until they are old enough to fly. After it can fly, which is in early May, it may then seek
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