DIY History | Transcribe | Scholarship at Iowa | The terrestrial Adephaga of Iowa (Part 1) by Fanny Chastina Thompson Wickham, 1895 | The terrestrial Adephaga of Iowa by Fanny Chastina Thompson Wickham, 1895, Page 4

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The terrestrial Adephaga of Iowa (Part 1) by Fanny Chastina Thompson Wickham, 1895

The terrestrial Adephaga of Iowa by Fanny Chastina Thompson Wickham, 1895, Page 4

Head
The head, varying greatly in size and shape, is free from the thorax, being attached to it by membrane only. Sometimes the portion behind the eyes is narrowed into a neck, or gradually narrowed and much prolonged so as to articulate with the thorax by a semicircular condyle, but usually it is but slightly narrowed and enters into the anterior portion of the thorax. It is usually horizontal in positions.
The surface consists of a solid corneous plate; above it is frequently marked by a single suture running transversely between or in front of the antennae - the clypeal or frontal suture. The portion in front of this suture when dilated so as to project over the mouth is the clypeus; it is sometimes membranous or coriaceous instead of horny like the rest of the head. In some insects the clypeus is divided into two portions, an upper- the nasus- and a lower, or rhinarium. To the lower or anterior border of the clypeus is attached the labrum.
The upper surface of the head is divided into

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Head The head, varying greatly in size and shape, is free from the thorax, being attached to it by membrane only. Sometimes the portion behind the eyes is narrowed into a neck, or gradually narrowed and much prolonged so as to articulate with the thorax by a semicircular condyle, but usually it is but slightly narrowed and enters into the anterior portion of the thorax. It is usually horizontal in positions. The surface consists of a solid corneous plate; above it is frequently marked by a single suture running transversely between or in front of the antennae - the clypeal or frontal suture. The portion in front of this suture when dilated so as to project over the mouth is the clypeus; it is sometimes membranous or coriaceous instead of horny like the rest of the head. In some insects the clypeus is divided into two portions, an upper- the nasus- and a lower, or rhinarium. To the lower or anterior border of the clypeus is attached the labrum. The upper surface of the head is divided into