Based on Campbell’s text, one of the Insects swooped down and actually pressed its flat face against Shea’s for a brief moment and was then gone. The other insects left Shea alone after this encounter. The disappearance of the insect and the subsequent visions and historical information that seemed to appear in Shea’s mind indicates that there may have been either a merging of alien insect / human minds or the insect “downloaded” a large part of its history into Shea’s mind. In Shea’s testimony he states that the insects were not “strictly material – constructed of some alien matter which allow its atoms to exist conterminously with those of my body.”
The idea in the story seems to be that the Insects (obviously their resemblance to Earthly insects is purely coincidental) are of such exotic matter that they can occupy the same space as a human brain without detrimental physical effects on either side.出处：https://lovecraftianscience.wordpress.com/2016/02/20/the-insects-from-shaggai-part-1-alien-matter/