"petroleum fly" meaning in English

{
  "forms": [
    {
      "form": "petroleum flies",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "petroleum fly (plural petroleum flies)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Dipterans",
          "orig": "en:Dipterans",
          "parents": [
            "Insects",
            "Arthropods",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Helaeomyia petrolei, a Californian fly whose larvae feed on dead insects that become trapped in naturally occurring petroleum pools."
      ],
      "id": "en-petroleum_fly-en-noun-OCQujs-y",
      "links": [
        [
          "California",
          "California"
        ],
        [
          "fly",
          "fly"
        ],
        [
          "larva",
          "larva"
        ],
        [
          "petroleum",
          "petroleum"
        ]
      ],
      "wikipedia": [
        "petroleum fly"
      ]
    }
  ],
  "word": "petroleum fly"
}

{
  "forms": [
    {
      "form": "petroleum flies",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "petroleum fly (plural petroleum flies)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Entries using missing taxonomic name (species)",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Dipterans"
      ],
      "glosses": [
        "Helaeomyia petrolei, a Californian fly whose larvae feed on dead insects that become trapped in naturally occurring petroleum pools."
      ],
      "links": [
        [
          "California",
          "California"
        ],
        [
          "fly",
          "fly"
        ],
        [
          "larva",
          "larva"
        ],
        [
          "petroleum",
          "petroleum"
        ]
      ],
      "wikipedia": [
        "petroleum fly"
      ]
    }
  ],
  "word": "petroleum fly"
}