TILLYARD. 165 



sub-equal sectors; fourth segment slender cylindrical, two-thirds as long as second; 

 fifth segment narrower and slightly longer than fourth, rounded at apes. Labium 

 (Test-tig. 3«) not quite as lung ;\s labium, of very primitive form, resembling 

 that of certain Mecoptera; arising from a moderately broad basal piece (probably 

 the mentum) there is a very narrow median lobe carrying two very small sharply 

 pointed processes, representing the inner lobes; on either side of these lie the 

 broad palpigers, from each of which arises a large two-segmented palpus of 

 typical Mecopterous form, the basal segment being the larger and paler, some- 

 what less heavily chitinised than the apical, and carrying only small slender 

 setae, while the apical segment has a broadly rounded tip and carries numerous 

 short stiff sensory setae arising from wide circular bases; the two palpi, though 

 separated for their entire lengths, clearly constitute a true labellum of primitive 

 type. 



Thorax of the usual shape for the family, the prothorax very small, the 

 mesothorax greatly swollen, the metathorax small, with the scutellum in the form 

 of a slightly projecting convex ridge. Colour velvety black with gTeyish 

 pubescence; scutellum shining black. Sides of thorax dull blackish, with a pale 

 testaceous area situated beneath the attachment of the wing on each side. 



Legs all very long; coxae and trochanters very short, testaceous, each with a 

 conspicuous tuft of stiff black hairs beneath it ; femora, tibiae and tarsi very 

 long, the hind femur stoutly built; colour black, except the bases of the femora, 

 which are testaceous. Measurements as follows : — 



Foreleg: — Femur 6, tibia 6, tarsus 5.8 mm. 



Middle leg: — Femur 6, tibia 5.4, tarsus 5.2 mm. 



Hindleg: — Femur 8.5, tibia 8.5. tarsus 3.8 mm. 



Middle and hind tibiae with a single long black spur (Plate xlv., fig. 5, a). 

 Hind tarsus (Plate xlv., fig. 0. a.) with the basal segment as long as the other 

 four plus the claws; length of segments in order, 1, 2, 5, 3, 4, (5 almost equal 

 to 3) ; segs. 1-4 very narrow, cylindrical, 5 enlarged basally and slightly curved, 

 its base beset with numerous stiff bristles, its outer margin hairy. Tarsal claws 

 (Plate xlv., fig. 7. o.) curved, sharply pointed, carrying on the inner side four 

 prominent teeth, of which the first is smaller than the others and placed close up 

 to the second; empodium apparently very rudimentary. 



Wings: — Forevrings subhyaline, slightly infuscated all over, with black 

 venation and a beautiful violet iridescence; pterostigina darkened. Venation and 

 secondary net-veining as shown in Text-fig. 1, a. The wings differ from those 

 of the genotype (E. chilensis Alex.) in being somewhat narrower in proportion 

 to their length, with the anal angle more prominent, the fork of R2 + 3 placed 

 further distad (half-way from base in E. australiensis, one-third from base in 

 E. chilensis), the basal stump of Rs shorter, R4+5 originating immediately below 

 ir, m-cu very short (almost obsolete in some specimens), the basal stump of M2 

 absent, though the kink (k) in the vein Mi + 2, at the point where M2 originally 

 came off, remains; Cu2 is closer to Cm than in E. chilensis, 1A diverges from 

 Cm distally, and 2A is complete from base to axillary lobe, and runs a little 

 beyond it. At the point h in Text-fig. 1, a, there is, in a few specimens, a de- 

 finite stump-vein projecting upwards and distad; this is evidently the stump of 

 an original R4, and indicates that the single vein hitherto taken to be R4+ 5 is, as 

 far as its distal portion is concerned, really only Rr>, R4 having been eliminated. 

 The posterior margin of the wing carries a fringe of fine hairs from base to 

 apex, those on the pedicel being the longest. 



Halteres 1.2 mm. long; pedicel slender, testaceous at base but darkening 

 distally; club broadly spatulate, black, with a small area of pale testaceous 

 basally. 



