Adult Head Morphology
Labial palpus modification:
Labial palpus variable in length, segments II and III usually rough and clothed with long, piliform scales.
Proboscis usually elongate, 1.5-2.5X the length of labial palpus; reduced, about equal to labial palpus in some African Ceromitia; basal 1/4 - 1/3 scaled.
Head vertex scaling:
Male scape description:
Scape sometimes slightly swollen in male.
Antennal sensillum present
General antennae description:
Antennae usually longer than forewing in both sexes; up to 3X length of forewing and arising nearly contiguous in males; antennae shorter in genus Cauchas, 0.5- 1.2X the length of forewing in both sexes; pecten usually present, ab- sent in Cauchas; flagellum filiform, usually fully scaled to apex with two annuli of appressed scales per segment, more thinly scaled ventrally; basal 0.2-0.6 of antenna roughly scaled in some Adela. Males of some Adela and all Nemophora with variable number of enlarged mediodorsal spines along base of flagellum.
Adult head description:
Vertex rough, densely covered with piliform scales: frons usually rough, occasionally covered by smooth, broad scales. Eyes small to large, interocular index 0.5-1.7; interfacetal microsetae scattered; eyes dimorphic in most Adela and Nemophora with that of males enlarged, more approximate at vertex, and usually with facets in upper 2/3 of eye enlarged. Maxillary palpi 2-5-segmented.
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