58 R. W. CROSSKE Y¥ 
THE ATROX-GRouP 
Diacnosis. Body blackish brown with at most only very faintest metallic purplish tinge 
on abdominal tergites. Parafrontals non-pollinose, but not metallic. ¢g claws rather short and 
thick. [Character of notopleural setae uncertain, one posterior seta on one side and two on 
other in atyvox holotype, only specimen known.] Last abdominal tergite with preapical trans- 
verse row of fine long erect setae differentiated from the hair. 
This group contains only one species which Enderlein (1936) made the type- 
species of his genus Idania. Though this species, atvox, is strikingly different from 
all other Chrysorutilia because of the unicolorous dark mahogany-brown to blackish 
brown colouring it agrees in all its essential features with the more typical species of 
Chrysorutilia and I unhesitatingly place it in this subgenus ([danza thus sinking as a 
synonym). At present, only the holotype of atrox is known; in some lights the 
specimen shows very faint traces of purple on the abdomen, and the genae and 
parafrontals—although brown and non-metallic—are seen to be devoid of definite 
pollinosity (atvox in this respect resembling /uzona-group). The holotype shows 
extremely well developed long black hair on the prosternal membrane and some 
shorter fine hairs on the front of the prosternum, much as in Juzona-group, and the 
hind tibial fringe is extremely well developed; it is a large specimen measuring some 
20 mm in length with slightly infuscate wings in which the veins of the middle region, 
especially anteriorly, are conspicuously yellow. It is possible that intermediate 
forms will ultimately be discovered which interconnect atrox with the /uzona-group, 
in which case the two groups could be merged under the latter name; at present both 
groups are found only in the Philippines, an area from which typical Chrysorutilha 
species (formosa-group) are not yet known. 
INCLUDED SPECIES 
Rutilia (Chrysorutilia) atrox (Enderlein) comb. n. Puitippines. [Holotype 
examined]. 
THE LUZON A-GROUP 
Diacnosis. Body largely golden green to dark blue; parafrontals, epistome and genal 
dilations metallic. ¢ claws rather short and thick. Notopleuron with posterior part extra- 
ordinarily protuberant and with two setae (notopleuron therefore with total of three setae). 
Last abdominal tergite with transverse preapical row of long setae differentiated from the hair. 
It is to this group that Townsend (1927) applied the name Philippoformosia, a 
genus based on sflendida Townsend from the Philippines. As with atvox (above), 
it seems to be that splendida Townsend has all the main characters shown by 
Chrysorutilia and I therefore place the generic name based upon it as a synonym; 
however, splendida together with /uzona Enderlein differs from typical Chrysorutila 
by the features mentioned in the diagnosis above and separate species-group status 
within Chrysorutilia is considered to be the most appropriate taxonomic treatment. 
Unfortunately splendida Townsend is known only from the female holotype and 
luzona only from the male holotype, and it is therefore difficult to be certain whether 
two distinct species actually occur; Juzona should perhaps be placed as a synonym 
of splendida Townsend, but for the present it appears best to maintain the names for 
