Archive image from page 148 of The anatomy, physiology, morphology and. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala.) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author; CUbiodiversity4765349-9885 Year: 1890 ( THE HEAD CAPSULE. 125 The revolution of the major axis takes place as a result of the withdrawal of the frontal sac into the interior, and the flattening of the posterior surface of the head capsule. During these changes the proboscis becomes furt
Archive image from page 148 of The anatomy, physiology, morphology and. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala.) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author; CUbiodiversity4765349-9885 Year: 1890 ( THE HEAD CAPSULE. 125 The revolution of the major axis takes place as a result of the withdrawal of the frontal sac into the interior, and the flattening of the posterior surface of the head capsule. During these changes the proboscis becomes further developed, and is gradually retracted within the head capsule. 25.—The Head and Proboscis of the mature nymph: /, lateral view; , lower surface ; 3, lateral view of the proboscis : f s, frontal sac ; ep, epistome ; a, lateral fold of rostrum ; /', clypeus; c, palpigerous scale ; 1/, swelling between meso- and prelabrum ; c, prelabrum ; f, discophore ; g, furca ; /;, discal sclerite ; /, cleft in the anterior margin of the oral sucker. It is generally stated that a lunula is characteristic of all the cycloraphic Diptera; in some, however, the frontal sac is not withdrawn into the head, but becomes greatly reduced in size, and remains external, or becomes obliterated by the great development of the frontal sclerites. Ktinckel d'Herculais
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