Chrysops moechus female Legend h hypopharynx lb labium

Chrysops moechus: female. Legend: h, hypopharynx; lb, labium; ll, labellum; lm, labrum; m, mandible. Note: labial groove indicated by dotted box. lm h m ll lb

Chrysops moechus; head, lateral view. Legend: a, antenna, h, hypopharynx; la, lacinia; lb, labium, ll, labellum, labrum; m, mandibles; p, palp. lb ll m p la h a lm Note: A U-shaped trough running the length of the labrum serves as a food canal. The hypopharynx, a flattened blade-like structure containing an internal salivary tube, forms the floor of the food canal. The six piercing stylets (labrum, 2 laciniae, 2 mandibles, and hypopharynx) lie in a labial groove when fly is at rest.

Chrysops moechus mouthparts (excluding labium and labrum). Legend: h, hypopharynx; l, lacinia, ; m, mandible; s, salivary tube. 0. 5 mm l l s h m m

Chrysops moechus mouthparts. Legend: h, hypopharynx; l, lacinia; m, mandible. l m h

Chrysops moechus, female labrum. A, position of labrum (arrow) relative to other mouth parts; B, labrum (entire, composite); C, distal tip of labrum (note cutting teeth) with vestibule. Legend: f, food canal; v, vestibule. A v f B v C f

Chrysops moechus, female labrum (hypopharynx removed). Note trichites (arrows) lining food canal (f). f

Chrysops moechus lacinia (composite). Box in A enlarged in B. 0. 5 mm A B