Genus Dayus Mahmood, 1967

Museums

Regional Maps

• Dayus Mahmood, S.H. 1967. A study of the typhlocybine genera of the Oriental region. (Thailand, the Philippines and adjoining areas). Pacific Insects Monographs 12: 1-52 [39].

  Type species:

   Dayus elongatus Mahmood, 1967 by original designation.

Introduction

This Oriental, eastern Palaearctic and Pacific genus of eight known species has a single record from the wet tropics of North Queensland. The species which occurs in Australia, D. euryphaessa (Kirkaldy), is bright red.

Distribution

States

Queensland

IBRA and IMCRA regions

IBRA

Qld: Wet Tropics (WT)

Diagnosis

Forewing: 1st and 4th apical cells broad at base, narrowed apically; 3rd apical cell petiolate, 4th apical cell barely attaining wing apex; cell M broader than cell R apically. Hindwing: vein 1V branching from 2V at point 2/3 distance from proximal end; vein Cu2 confluent with submarginal vein near basal third of wing; submarginal vein extending around wing apex and confluent with apex of vein "R+M"; apex of vein Cu1 confluent with apical portion of vein M3+4. Genital capsule: ♂ plate with combined widths broad, longer than pygofer, in ventral view curved slightly in middle, apex broadly rounded with an apical lobe in some forms, macrosetae stout, long, arranged in an oblique row starting from base to apex, with a cluster of macrosetae at basal angle (which are directed dorsad over the pygofer disc in lateral view), with microsetae along lateral margin throughout length; pygofer compressed dorsoventrally, caudal margin with a caudodorsal rounded lobe provided with one or more sharp setae, with a group of macrosetae on dorsocaudal margin directed dorsad and caudad, with microsetae scattered all over caudal half of disc, pygofer process slender ventrally. Internal ♂ genitalia: Style slender, caudal portion gradually narrowing and curved laterad into a sharp pointed apex which is provided with a row of tuberculate structures, microsetae few, long, arising laterally proximad of tubercles; connective Y-shaped or nearly so, stem of Y longer than arms; aedeagus in dorsal aspect without any preatrium or dorsal apodeme, shaft short branching into long paired processes which are twice crossed.
This genus has characters in common with Empoasca Walsh but differs in the absence of an anal hook, the much wider plates and the dorsoventrally compressed capsule. (Mahmood 1967).

ID Keys

Mahmood 1967: 29–30

Diagnosis References

Mahmood, S.H. 1967. A study of the typhlocybine genera of the Oriental region. (Thailand, the Philippines and adjoining areas). Pacific Insects Monographs 12: 1-52 [39–40]

History of changes