Genus Heptaphlebomyia. 535 



a spot of white scales at their base. This spot is confined to the 

 median area and may spread out so as to reach the sides of the 

 segment ; from thence it is converted into a long lateral spot as 

 far as the last segment. The basal genital lobes are very short. 

 They show beneath, towards the median region, five hairs and a 

 large transparent plate spatulate in form. The clasper is larger 

 at the base than at the apex and ends in two short teeth, one 

 larger than the other. 



Wings. — Not spotted. The first sub-marginal cell much 

 longer and narrower than the second posterior cell ; its base is 

 nearer the base of the wing than the apex of the sub-costal ; the 

 stem, is equal to half its length as is also the stem of the second 

 posterior. The supernumerary cross-vein is nearer the base of 

 the wing than the mid. Posterior cross- vein is distant from the 

 mid twice its own length. This species has a false nerve covered 

 with a row of scales which forms a seventh vein. 



The legs are yellow with a slender line of white scales. In 

 the anterior legs, the dorsal area of the femur is covered with 

 yellow scales, and the apical part with black scales ; the apex 

 has a spot of white scales ; the tibia is covered with yellow 

 scales and some black ones on the dorsal area ; apex with a 

 spot of white scales ; all the rest of the leg is covered with 

 black scales with yellow reflections. The claws are equal, 

 long and dentate. The mid legs resemble the anterior, and the 

 two ungues unequal, one dentate ; the femur of the posterior 

 pair is covered with yellowish white scales on two-thirds of their 

 length ; the other third is covered with black scales, a small 

 apical spot of white scales ; tibia black, with a beautiful white 

 band at the apex ; remainder of the leg black ; the ungues short, 

 equal, not dentate. 



Formula of ungues. — 1 * 1-1 • 0-0 ' 0. 



Length. — 6 * 5 mm. including proboscis. 



J . Head. — Resembles that of $ . Segments of antennae 

 yellowish. Palpi black. Proboscis black with a yellow band in 

 the middle. 



Thorax. — Laterally the thorax shows 9 to 10 little white 

 spots. Abdomen, legs and wings like the $ . 



Formula of ungues. — * 0-0 ■ 0-0 ' 0. 



Length. — 5*5 mm., including proboscis. 



Habitat. — Tananarive and environs. It can be taken at all 

 times of the year, but especially during the rainy season. It is a 

 very rare species " (Yentrillon). 



