Abstract
Larval mermithid worms were found in mosquito larvae from pools, Delaware Co., Penna., as follows 146 Aedes vexans, 76 infected; 53 Culex salinarius, 4 infected; and 18 C. pipiens, 10 infected. The worm, under the exoskeleton of the insect s thorax, prevented pupation. On the worm''s emergence, the larva quickly succumbed.

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