Mature larvae of the Psychodinae are elongate, legless, and up to 6 mm long (Fig. 9.3). The larvae of many genera (e.g., Pericoma) have long spines or feathery processes along the body, but these are poorly developed in Psychoda and Telmatoscopus. In Psychoda and Telmatoscopus the body is fusiform or subcylindrical, with three thoracic and nine abdominal segments. The segments are secondarily divided into annuli, with two annuli comprising the thoracic and first abdominal segments and three comprising abdominal segments 2—7. The dorsal cuticle has

eight-segmented. The male genitalia are large and conspicuous.

The mouthparts form a short probocis, bearing long, recurved, five-segmented palps with scattered setae. The mouthparts of the female consist of six broad, knifelike stylets (labrum, paired mandibles and maxillae, and hypopharynx), which are held within the fleshy labium when not in use. The mandibles and maxillae are toothed distally. The mandibles cut the skin with scissors-like and sawing movements while the maxillary teeth engage the sides of the wound and hold the mouthparts in place. Blood is taken from a subcutaneous pool produced by injury to the vessels. The food canal is formed by apposition of the labrum above and the hypopharynx, which contains the salivary duct, below. Males lack mandibles and do not bite, but some have been observed to take blood from wounds made by the females.

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