
REVISIONARY CLASSIFICATION OF RUTILIINI 57 
long and dense and forms a very conspicuous bushy tuft in which the individual 
hairs are often rather crinkled apically (Text-fig. 24) ; in some of the species the hairi- 
ness extends on to the base of the lower calypter. Hairing of the lower calypter 
occurs, so far as I know, nowhere else in the Rutiliini, but as it is not at all consistent 
throughout Chrysorutilia it has not been cited as a character either in the subgeneric 
key or the diagnosis; nevertheless it can be a useful feature in recognizing, or helping 
to distinguish, some species. In the smaller species of Chrysorutilia the lower 
calypter is usually completely bare or has only a very few hairs at the extreme base 
adjacent to the suprasquamal ridge, but in some of the larger species such as R. (C.) 
splendida (Donovan) the whole basal depression of the calypter has conspicuous erect 
dark hair on the upper surface; in R. (C.) cryptica sp. n. half the surface of the lower 
calypter or more is hairy. 
In Chrysorutilia the genal dilations of the head are much more extensively metallic, 
because they are only very thinly pollinose or because they are bare, than in the 
other subgenera; in other Rutilia s.1. the lower parts of the head are thickly pollinose 
(except in Neorutilia) and only the postbuccal regions at most have any trace of 
metallic colouring. In Chrysorutilia at least the posterior half and sometimes the 
whole of the genal dilation is shining golden green, cupreous, blue-green or blue- 
violet, at least in some lights. In the Jwzona-group even the epistome is largely 
shining golden green to steely blue and only very thinly pollinose, and there are bare 
shining parafrontals. MHairing of the parafacials is more developed than in other 
Rutilia s.1., and the males of many Chrysorutilia species have specially dense hair 
which reaches to the bottom end of the parafacials, to a point about level with the 
bottom-most point of the eye seen in profile; when hairy parafacials occur in other 
subgenera the hairing normally does not reach so far down on the parafacials. The 
facial carina in Rwutilia s.1. reaches its most wide and flattened condition in Chryso- 
vutilia, with the result that the antennae in this subgenus tend to be distinctly more 
widely separated at their insertions than is normally the case in other forms; nor- 
mally the carina is exceptionally parallel-sided, tending not to widen at a level with 
the base of the third antennal segment as in other subgenera, and often it even 
widens noticeably towards the ventral end. 
Three species-groups are recognized in Chrysorutilia and can be distinguished by 
the following key: 
KEY TO THE SPECIES-GROUPS OF CHRYSORUTILIA 
1 Body extensively metallic, gold-green or cupreous to blue-violet . : 2 
— Body uniformly blackish brown, not metallic, at most only slight trace of Paria 
tinge on abdomen. [Philippines] . : atrox-group (p. 58) 
2 Parafrontals and epistome metallic. Two posterior notopleural setae on unusually 
strongly developed (almost knob-like) protuberance. [Philippines] 
luzona-group (p. 58) 
— Parafrontals and epistome not metallic. Notopleuron normal, with one posterior 
seta and hind part of notopleuron sag prety et gayle {Not known from 
Philippines] . : : : 2 formosa-group (p. 59) 
