Story on the back:

"As if the Martian death rays hadn’t caused enough destruction and tumult to the people of Earth, a new horror was suddenly released on them. Saucers flew over heavily populated cities, releasing huge insects to destroy property and lives. The Martians had gathered insect specimens from Earth, enlarging them with their scientific equipment to 500 times their regular size. The normally annoying pests were now transformed into deadly menaces, attacking any slow-footed human around. The new peril made Earth citizens more helpless than before, for at any time one of the winged terrors might swoop out of the sky to claim another victim."