170 J'^iy- 



Denotata. In establishing this species on the characters of the 

 female, some doubt was expressed whether the right male had been 

 assigned it. That note of caution has now been fully justified. In 

 overhauling lately some unsorted material I came upon three males 

 which are unquestionably the true denotata and quite distinct from the 

 form described in the text. They were taken as far back as the 7th of 

 May, 1906, at Devereux Pool. As might have been expected, they bear 

 the same close relationship to male tumida. as does the female denotata 

 to female tumida ; that is, the peculiar blunt-ended abdomen with its 

 characteristic hypopygium, which distinguishes male tumida, equally 

 distinguishes male denotata, just as the swollen costa, characteristic of 

 the female, is common to both species. The points of distinction from 

 tumida are the brown instead of black halteres, ths relatively shorter 

 costa and costal fringe, the 1st costal division equal only to the 2nd 

 instead of to the 2nd and 3rd, and in the smaller size, all which 

 amply differentiate from tumida and at the same time show its close 

 agreement with denotata. Denotata is apparently an early summer 

 species and tumida essentially an autumnal one. 



The discovery among some old material of one or two little males, 

 extremely like the insect erroneously given as the male of the above 

 species, has quite removed any doubt of that insect having been 

 discreta, as was indeed half suspected at the time. 



Rubescens, sp. n. This belongs to the large group with bare pleurae 

 and bare hindtibise in Section C, and to that portion of it characterised 

 by having dark (in this case yellowish brown) halteres 



(J . Thorax dull dusky i-ed, abdomen black, halteres yellowish broAvn ; f rons 

 black, about half as broad again as long, supra-antennal bristles rather small, 

 the upper approximate and twice the size of the under ones, antennae red, 

 scarcely full-sized, palpi rather large and clear yellow, the bristles large ; wings 

 tinged with yellowish brown, costa more than half the wing length, fringe only 

 moderately long, 1 rather longer than 2 + 3, angle at 

 fork largish, 1st thin vein scarcely curved at its origin; 

 legs yellow, hind femora with moderately long hairs on 

 basal portion of underside, hind tibiae bare ; hypopy- 

 gium (fig. 4) fairly large, underneath it a large and 

 Fig 4. Kuhoirens. conspicuous group of bristles or strong coarse hairs, 



anal organ large and yellow. If mm. 



Of this well marked species I took a specimen on a window of this 

 house as far back as June, 1905, but refrained from describing it as it 

 was a single specimen. The capture of another, exactly similar and 

 under precisely similar circumstances, on the 8th of August, 1910, has 

 removed all scruples, and I propose the name of ruhescens for it on 



