598 SCENOPINID.E 



dies away about half-way up ; upon close examination a narrow bare polished 

 eyemargin can be traced all down the sides of the face and round under the 

 eyes to nearly half-way up the back of the head ; f rons forming a long 

 narrow triangle above the antennae and extending at its point more than 

 half-way to the occiput, dull roughened black with sometimes a slight middle 

 channel which may even shine in some lights, and bearing sparse short 

 glistening white depressed pubescence ; vertex practically bare and forming 

 a rather shining black short triangle. Proboscis short, brownish ; palpi 

 fairly long, brown, and bearing slight broAvnish yellow hairs. Eyes bare, 

 practically touching for about six or eight facets above the 

 middle of the space between the antennae and the occiput ; 

 facets on the larger upper part conspicuously and sharply 

 larger than those on the rather smaller lower part, and the 

 dividing line rather curved. Antennae (fig. 330) dull brov/nish 

 black, placed in a pit-like depression as mentioned above ; 

 basal joint very short ; second joint also short and trans- 

 ^2t'oI^!!ii7^r^^''^^An^ verse, almost bare : third joint subulate, about four times 

 as long as broad at base and slightly diminishmg towards 

 its tip but stiU ending very bluntly and with any trace of a terminal style or 

 arista concealed in a sort of pit. 



Thorax dull black, almost shagreened, and bearing exceedingly fine but 

 fairly abundant scale-like greyish pubescence ; humeri at the extreme hind 

 angle, and the postalar calli more extensively, usually chestnut ; pleurae rather 

 shining because their punctuation is less coarse but with their pubescence 

 longer and more distinct, until the sternopleurae become still more shining 

 and their pale grey pubescence fairly obvious ; pteropleurae polished black 

 and quite bare. Scutellum similar to the disc of the thorax and usually 

 chestnut on the underside, but all these chestnut markings often very obscure. 

 Abdomen longer than the thorax, flattened on the disc, shining black 

 especially about the sides ; second to fourth segments about equal in width, 

 the first being rather narrower, and the fifth and sixth diminishing in width 

 towards the genitalia though more shelving over at the sides, the seventh 

 short and drawn back dorsally about the middle to allow room for the swollen 

 genitalia ; second segment conspicuously long, being longer than any other 

 two together, but the others except the shorter seventh segment nearly 

 equal in length ; extreme basal margins of the fourth and fifth segments 

 (or the membrane between them) conspicuously pure white, but the white 

 bands not quite extending to the sidemargins. and a similar band is just 

 traceable on the sixth segment ; pubescence composed of such minute black 

 bristles as to be almost impercejitible, except for a slight pale pubescence 

 about the basal corners and some pale hairs on the genitalia. Belly shining 

 black with chestnut reflections, bearing minute black bristles which become 

 increasingly crowded after the second segment • dorsal plate of the abdomen 

 considerably overlai^ping the ventral plate, (jlenitalia large, with two large 

 brownish black upper plates which push the sixth and seventh abdominal 

 segments backwards and upwards, and these plates bear on their hind- 

 margins a fringe of rather long pale yellow or brownish yellow hairs, Avhile 

 beneath them are two other large inflated plates which bear a few short pale 

 hairs and which leave a small apical space between them from the lowest 

 point of which a small yellowish pale haired process may protrude. 



Legs shining chestnut, but the coxae and trochanters with blackish reflec- 

 tions, and the femora occasionally, and the tibiae (especially the hind pair) 

 frequently, with extensive darkened or even blackish markings; tarsi also 

 considerably obscured, but chestnut at the base for at least the basal half of 

 the first joint of the front pair, the basal three-quarters of the first joint of 

 the middle pair, and the three basal joints of the hind pair except at their 

 tips ; femora short and thick, front pair most so and hind pair least so ; hind 

 tibiae slightly curved but not at all dilated anywhere. Pulvilli small, brownish 

 orange ; claws small, black. Pubescence slight and all pale, forming distinct 

 fringes behind the anterior femora, and a delicate thin fringe of longish pale 

 hairs behind the basal half or more of the hind tibiae ; no spurs present, 

 but bristly almost spur-like hairs exist at the tip of all tibiae. 



Wings with a faint brownish tinge; veins brown and strongly marked, 



