All other sources that list synonyms for cicada give ... 蛥蚗, 螇螰, 蟪蛄 ... suggesting that ⿰虫産 is an error for 螰, although the two characters are not very similar.

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▲ 新城縣志（民國24年刊本）卷21 folio 25.

Both 新城縣志 and 河北通志稿 are authored by 王樹枏, so the text is identical to each other.

BTW the source should be corrected as 《河北通志稿》 方言篇卷下 folio 12.

The original evidence 「蟬……其見於爾雅方言說文者」suggests that the text is a quote from 爾雅、方言、說文解字 about the names of cicada.

I searched 螇 in 爾雅|説文解字|方言 from the 四部叢刊 texts:

説文解字（四部叢刊景日本岩崎氏靜嘉堂藏北宋刊本） has 螇鹿.

方言（四部叢刊景江安傅氏雙鑑樓藏宋刊本） has 螇螰

爾雅（四部叢刊景常熟瞿氏鐵琴銅劍樓藏宋刊本） has 螇螰

爾雅（四部叢刊景常熟瞿氏鐵琴銅劍樓藏宋刊本） also have 螇蚸, but that is not the name of cicada.

Based on these evidences, I agree with Andrew that ⿰虫産 is an error for 螰. But since we have two evidences, better just encode it.