104 R. W. CROSSKEY 
haired prosternal regions, the head facies, and abdominal form, but Chrysopasta 
differs from Amp/ibolia s.1. by having the back of the head metallic, stronger and 
more extensive vestiture on the facial ridges, by the rather more slender mentum 
and smaller palpi, and by the weaker abdominal chaetotaxy (in which discal setae 
are absent on T3 and T4 except for the occasional occurrence of a small isolated 
adventitious setula). 
The head in Chrysopasta shows some unusual features not found in quite the same 
form in other Rutiliini. The epistome reaches its most strongly nasute development 
among the whole tribe, being extremely prominent in profile and set off from the 
facial carina by a very deep concavity (Text-fig. 6), and the facial ridges are more 
strongly and extensively haired above the vibrissae than in other genera; the setae 
of the frontal rows also descend further down on to the extreme upper ends of the 
parafacials than in other genera, so that in profile there is a smaller gap than usual 
between the uppermost setulae on the facial ridges and the lowermost frontals. 
The parafacial hairing is more strongly developed than is normal and extends to a 
level below the bottom of the eye (the hairing virtually merging with the hairing 
of the genae) ; in other Rutiliini the parafacials, when haired, have the hairing only 
extending about to the bottom of the eye at most and there is a definite bare gap 
between genal and parafacial hairing. The postorbits in Chrysopasta are most 
characteristic, having silvery-white pollinose spots alternating with black (almost 
non-pollinose) spots, this being very obvious to the naked eye and having no counter- 
part elsewhere in the Rutiliines; somewhat similar pollinose areas having a shifting 
chequered appearance are present on the lower ends of the parafrontals. 
In many specimens the mesonotal chaetotaxy is very strong. The humeral 
callus rather characteristically has only three setae set in a shallow triangle with the 
innermost seta unusually strong, but there is sometimes a weakly developed fourth 
seta laterad of the innermost strong one, so that the humeral chaetotaxy is basically 
the same as in other Rutiliini. When several specimens are examined the chaetotaxy 
is found to be much more variable than Paramonov’s (1968 : 373) description 
indicates: one very strong ph (Paramonov’s ‘sublateral’) is normal, but a second may 
be present ; 2 + 2 acy is common, but there may be more presutural acrostichals than 
two; the post dc are usually four (length and strength very variable) ; often three or 
even four supra-alars; though usually only one strong post ia seta is present the 
female often has two very strong post ia. The sternopleurals are variably 1 (2) + 1 
as Paramonov states. The legs of Chrysopasta are more strongly bristled than usual 
in Rutiliini and the claws and pulvilli are exceedingly large, especially in the male in 
which they are strikingly obvious to the naked eye; the hind tibia has a long antero- 
dorsal fringe but this does not form a regular close-set comb as in many Rutiliines, 
being composed instead of some fine rather hairlike setulae interposed between longer 
and stronger ones so that the fringe is irregular and loose (not comb-like); the pv 
apical seta of the hind tibia is much longer and stronger than usual. 
The mesonotum has a bold pattern that is a little different from any other Rutiliine. 
The prescutum and scutum are pale silvery bluish and have four broad bold sooty 
black vittae that are discontinuous at the suture so that the scutum appears to 
have a transverse row of four elongate spots of black (of which the inner pair are 
