50 R. W. CROSSKEY 
metallic head, only one stfl seta and no hind tibial fringe; the hairing of the 
suprasquamal ridge is also much longer, more bushy and crinkly, than in Donovanius 
(in which respect Neorutilia agrees with Chrysorutilia). The hairing of the supra- 
squamal ridge at once separates Neorutilia from Amenianuma subgen. n., from which 
it also differs by the pteropleural character, the metallic head, the three postalars, 
the lack of white pollinose spots, the flattened scutellum and the supernumerary 
prescutellar setae. 
In simplex the presence of very strong supernumerary setae on the scutum 
immediately in front of the scutellum is a striking feature; it is difficult to distinguish 
which actual setae are the supernumeraries and which are the true hindmost setae 
of the dorsocentral and acrostichal rows, for together the setae (which are all un- 
usually strong, rather straight and thick) form a transverse row of more or less 
homogeneous setae (very much resembling then the transverse rows of prescutellar 
setae formed in a similar way in many species of Formosia or in occasional species of 
Rutilia (Donovanius) such as sabrata (Walker)). Development of such super- 
numerary prescutellars appears to occur rather haphazardly in unrelated groups of 
Rutilines. 
It does not seem likely that Neorutilia has any close relationship with the other 
subgenera possessing only three postalar setae, Rutilia s.str., Grapholostylum, and 
Microrutilia, for apart from this character and the lack of the hind tibial fringe it 
has little in common with these subgenera, differing from them greatly in general 
appearance, metallic head, one stpl seta, flattened scutellum, supernumerary pre- 
scutellar setae, and the long thick suprasquamal hairing (in contradistinction to the 
rather short sparse ridge hairing found in Rutilia s.str. or Grapholostylum). 
Apart from the characters cited in the diagnosis and discussed comparatively 
above there are some other curious features found in simplex that require comment. 
The facial carina seems, from the small number of specimens so far available, to be 
unusually sexually dimorphic, being much longer and more strongly pinched-in 
towards the lower end in the female than in the male, and the antennae of the female 
to be correspondingly longer than those of the male. There is also something 
‘different’ about the facies of the head when seen in facial view that is hard to 
define in words or to figure satisfactorily but is associated with the fact that the 
lower ends of the facial ridges are more flattened than is usual in Rutilia s.1. end more 
extensively haired; normally in Rutilia there are only one or two irregular series of 
hairs on the facials laterad and ventrad of the main vibrissae, but in simplex there 
are some three or four irregular series of rather small hairs. Another unusual 
feature is the nature of the arista, which is exceptionally long and fine and is virtually 
totally bare; in all other Rutilia the arista is obviously more thickened on much of 
its length and is always conspicuously pubescent or sometimes even short-plumose. 
The claws are shorter than in most other species of the genus, and the fore tarsi are 
shorter than in all other species. Malloch (1936) pointed out in the original definition 
of Neorutilia and description of simplex that the section of the costa between the 
apex of the subcosta and the first vein (second costal sector) is subequal in length 
to the section between the apex of the first vein and apex of the second vein (third 
costal sector), and remarked that he had not seen other species with similar costal 
