98 R. W. CROSSKEY 
— Vertex of § unusually narrow, about 0-09 of head-width. Median whitish vitta of 
the prescutum evanescent posteriorly, not reaching to suture . : . A. wilsoni 
[This species is known only from the g holotype. The genitalia have not been 
examined. ] 
Amphibolia (Amphibolia) papuana sp. n. 
@. Head. Ground colour mainly blackish, except for yellowish facial carina and reddish 
brown genal and postbuccal regions; parafiontals and interfrontal area black; head pollinosity 
white, thinner on parafrontals than elsewhere (in some lights lower end of parafrontal shows 
distinct line of demarcation where thicker pollinosity on parafacials and bottom end of para- 
frontal meets area of thinner pollinosity on parafrontal). Parafrontal and occipital hair black, 
genal and post buccal hair dark reddish brown. Frontal setae short and very fine, tips of oppo- 
site rows not meeting; one pair of divaricate ocellar setae; two pairs of well developed proclinate 
orbital setae. Vertex 0-24 of head width. Facial carina longer than epistome, narrow and 
nearly subfusiform but slightly widened at level with junction of second and third antennal 
segments and very slender on ventral third; facial profile moderately excavate between epistome 
and carina. Gena exceptionally broad, about 0-55 of eye-height. Parafacials very broad, 
about three and a half times wider than third antennal segment, entirely bare. Antennae 
slightly elongate, falling short of mouth-margin by about two-thirds of length of third segment; 
basal segments reddish with some black infuscation on inner edge of second segment, third 
segment blackish brown except for some bright orange colour at base; arista with short pubes- 
cence. Palpi tawny yellow. Thorax. Brownish black to black with bold white spots con- 
spicuous to naked eye. Spots arranged as pair of large humeral-notopleural marks, pair of 
sublateral prescutal vittae (in which each vitta strongly contracted medially so that to naked 
eye the white vitta appears as separated spots), pair of slender median white vittae on prescutum 
between the sublateral vittae, pair of supra-alar spots on scutum and pair of submedian spots 
on scutum (these less boldly white than other spots); in addition prescutum with pair of very 
small spots standing against transverse suture just mesad of humeral-notopleural spots; meso- 
pleuron and sternopleuiron with large white spot; seen from in front prescutum shows trace of 
blue-green colouring under the anterior parts of the sublateral white vittae, and seen laterally 
scutum shows trace of coppery violaceous glints around supra-alar spots. All thoracic hair 
black. Chaetotaxy rather weak, three pairs of presutural acrostichal setae differentiated 
(standing on median white lines), two post ia setae, I + 1 sternopleural setae, no setae developed 
on inner half of humeral callus (only two setae on outer half). Scutellum with very strong 
crossed apical setae, three or four pairs of other marginals, and with well developed preapicals. 
Wings. Basicosta dark. Wing membrane hyaline except for boldly marked basal dark spot 
in which cells completely blackened. Calyptrae blackish brown with dark brown marginal 
hair. Legs. Blackish brown with all black hair. Chaetotaxy weak, most setae short and 
fine; mid tibia with only one distinct ad seta; hind tibia with very short weak ad fringe and with 
two main ad setae and two pd setae. Abdomen. With black-and-white pattern. Tr + 2 
and T5 entirely black. T3 with thick covering of whitish pollinosity over most of surface, 
except for very small median anterior V-shaped black mark and three black spots against hind 
margin; black spots arranged as lateral pair on extreme sides of abdomen and a broad median 
spot. T4 black with a transverse fascia of thick whitish pollinose covering on anterior quarter 
or third, the pale pollinose area extending back to occupy nearly half the tergite length mid 
dorsally and extending black medioventrally to reach the hind margin. Greenish tinge visible 
on pale pollinose areas of T4 dorsum, and venter distinctly green under the pale pollinosity; 
black areas of venter with violaceous tinge in some lights. Pale pollinose parts of T3 and T4 
together giving abdomen appearance of having a broad transverse pale band contrasting with 
the black base and apex. Abdominal hairing black, mainly short, fine and semi-recumbent, 
but longer and erect on T5 and medially on T4. T3 with one pair of erect median marginal 
setae. T3 and T4 without discal setae, but holotype (only available specimen) has one large 
pore (seta itself missing) on the anteromedian V-shaped black mark of T3 near the fore margin 
