SCENOPINUS 599 



tliouo-h the lower one from the discal ceU ( = the upper branch of the postical 

 fork) and the anal vein do not quite reach the wmgmargm ; costal vein 

 finishing before the wing-tip and not continued as an ambient vein ; upper 

 branch Sf the cubital fork about two-thirds the length of the lower branch, 

 and ending in the costa about half-way between the radial vein and the lower 

 branch of the fork ; subcostal vein stouter than the others and more 

 surrounded with brown. Squamae (alar) small, blackish grey, with a very 

 short CTev fringe ; thoracal pair absent. Halteres with the large knob occa- 

 sionally all white, but more commonly white with the upper part brown, or 

 chestnut brown with the upper part blackish, or all dull orange or brown 

 more or less darkened, but with the rather short stem always darkened. 



9 Very similar to the male, but the frons about one-fifth tlie width of the 

 ' head • the frons has the narrow sidemargins shmmg and slightly curved 

 so that it is slightly wider near the antennae than about the middle, and 

 it is dull black ^but roughened by coarse punctuation and striae radiating 

 from the lower ocellus, but sometimes when the punctuation is less dense 

 it is rather shining, and usually bears a depressed middle line which is 

 sometimes sli^-htlv shining on its middle part or even for its whole length, 

 and tMs line maj be widened about its middle .part though not. enough 

 to form a large rounded depression, and the minute pubescence is pale ; 

 the eye-collar on the upper third of the back of the head is puffed out and 

 shining black unless occasionally rendered dull by dense grey dust, and 

 no tiny bristles occur down the postocular band; the raised collar is quite 

 distinct from the hollowed-out back of the head, and diminishes downwards 

 until about the middle where it amalgamates with the back of the head, but 

 all the eyemargin round to the jowls still remains puffed put. l.yes with 

 the facets all equal- in life clear brown with aeneous reflections and a dart 

 purple band about four facets wide across from almost the front margin just 

 above the level of the base of the antennae to almost the hmdmargm. Antennae 



as in the male. . , , , . 



Thorax as in the male, but with even shorter pubescence. 



Abdomen flatter and without any white transverse bands; the six 

 segments after the long second one almost equal in length and the third to 

 the sixth with a transverse depression across the midd e of each, which is also 

 slightly visible on the sixth segment and on the second, near the hindmargin 

 pubescence very short, but slightly longer and greyish towards the basal 

 corners ; the segments are almost parallel-sided until .the base of the seventh. 

 Ovipositor small but broad and projecting from the tip of the abdomen 



Legs similar to those of the male, but the fringe, behind the anteiioi 

 femora almost absent though the delicate ciliation behind the hmd tibiiB is 

 quite as strong. Pulvilli greyish yello\v m life. ^^.^„,i,-„o- tn thp 



Wings with the radial vein sometimes distinctly not extending, to the 

 wino-margin, though in individual specimens it may do so m one wing but 

 notm the other. Halteres very variable in colour, being sometimes all clear 

 white, but often white on the underside of. the knob, or «o/?etimes obscurely 

 whitish for a moderate space on the underside and shmmg black on the upper 



side. , 



Length about 5 mm. $ , 6 mm. ? . 



This species varies beyond what is mentioned in the above description 

 in the amount of darkening on the legs, the hind tibise being often entirely 

 blackish while the other tibiae may be considerably obscured ; large blackish 

 loDcritudinal spaces also often occur on the femora, or the hmd egs may De 

 alnrost entirely blackish with only the knees rather broadly and the 

 base of the tarsi dark orange; the wings and especially the vems vary 

 towards being more blackish; in two large females m perfect condition 

 taken at Crowborough on June 27, 1903, the rosette of stride radiating 

 outwards from the front ocellus is conspicuous. A peculiarity ot tlie 

 female lies in the frequency with which the tip of the wmg is broken oil, 



