30 R. W. CROSSKEY 
KEry TO SPECIES OF THE SUBGENUS FORMOSIA s. str. 
[Note: F. (F.) viridiventris is omitted as it is easily recognized from the separate species-group 
characteristics and description already given. Specific limits are very uncertain at present 
for the other species, i.e. those of the mirabilis-group, and it is not yet clear to what extent the 
small differences in male genitalia provide dependable specific criteria. The following key is 
therefore very tentative and is merely a preliminary one which runs out the supposed species 
on the external characteristics shown by the types. Specimens exist in museum collections of 
undetermined species, possibly new, which will not necessarily run out in the key. ] 
1 Legs predominantly reddish yellow (at most only the tarsi blackish and some 
reddish darkening apically on the femora). Pleural regions of thorax with 
mainly pale yellow to golden orange hair. Epistome reddish yellow to pale 
tawny reddish. Third antennal in orange (sometimes suffused with light 
brownish apically) ‘ 2 
— Legs black-brown to black (at most only apices of femora pale and tibiae sometimes 
a little reddish). Pleural regions of thorax with black or yellow hair. Epistome 
blackish brown to black. Third antennal segment dark reddish brownto black . 4 
2 Eyes of g very strongly approximated, interfrontal area obliterated on the upper 
frons, frons at narrowest point not more than 0-04 of head-width; upper eye 
facets conspicuously enlarged. Mair of tibiae all black. Upper parts of para- 
facials conspicuously metallic in almost any light . ; 3 
— Eyes of f not very strongly approximated (separated by distance chou fare nes 
as great as diameter of anterior ocellus), interfrontal area reaching to ocellar 
triangle, frons at narrowest point o-o8—o-10 of head-width. Hair of tibiae 
partly or largely golden red. Upper parts of parafacials rather thickly pollinose, 
hardly appearing metallic from any viewpoint. [Java] . : ‘ F. flavipennis 
3 Hair of fore coxae mainly golden orange (only the strongest vestiture black). 
Extreme costal base with golden red hairing ventrally. Tarsi reddish yellow to 
dark red, almost concolorous with remainder of legs. Crinkled hair of mesopleural 
hind margin almost all golden orange. Frons of § at narrowest point subequal 
in width to anterior ocellus, about 0-04 of head-width. [Celebes] . : F. eos 
— Hair of fore coxae mainly black (some golden hair at base). Hairing of costal base 
all black. Tarsi blackish, conspicuously darker than remainder of legs. 
Crinkled hair of mesopleural hind margin almost all black. Frons of g§ extremely 
narrow, eyes nearly meeting, frons at narrowest point not as wide as anterior 
ocellus, only about 0-02 of head-width. [New ey ee : ; : F. glorificans 
4 Hair of pleural regions of thorax all black : : : : : 5 
— Hair of pleural regions of thorax pong pale yellow or golden ‘ : : : II 
5 Forms from Celebes . - : : : 6 
— Forms from Moluccas, New Guinea or Bismarck eRe 
6 Calyptrae smoky brown with brown fringes. Postbuccal and genal hair ‘black. 
Abdomen mainly a beautiful, brilliant, metallic blue; blue colour occupying most of 
each side of tergites 3-5 but divided medially by a broad bold black median vitta; 
hind margins of T3—T5 only narrowly black. Wings rather uniformly greyish 
brown infuscate. ¢ eyes separated by a distance only about equal to twice width 
of anterior ocellus, but interfrontal area not obliterated and reaching to anterior 
ocellus (interfrontal area conspicuous therefore even at narrowest point of frons 
and slightly wider at this level than a parafrontal) . . ‘ . F. heinrichiana 
[This species is known only from the ¢ holotype] 
— Calyptrae pale orange-yellow with yellow fringes. Postbuccal and genal hair pale 
yellow. Abdomen without such blue-and-black pattern, tergites 3-5 each with a 
purplish red transverse band that is not, or only very faintly, interrupted 
