— 644 — 



half of Costa; those on hind wing still longer, especially on termen 

 and dorsum. They are uniform gray. Antennae reaching nearly the 

 apex of the fore wing, grayish, annulate. Vertex and occiput (pi. V, 

 f. 2) covered with large scales, frons with smaller ones, appressed. 

 Patagia and tegulae indistinct. Body covered with scales mixed with 

 some hairs. Tibiae and tarsi densely haired, the latter annulate. 



Head (pi. V, ff. 3—5) large, oblong, with vertex and frons 

 strongly convex, clypeus and its subdivisions invisible, labrum indistinct, 

 genae narrow, impressed, eyes large, convex, reaching antennal grooves 

 and slightly excised on the frontal margin. Ocelli absent. Antennae 

 filiform, simple, scaled; scapus five times longer and two times broa- 

 der than the ordinary joint of the base of funicle, slightly concave and 

 margined by a pecten of setae; funiculus of about forty joints. Trophi 

 (pi. V, ff. 3—5) well developed; labrum indistinct; pilifers large and 

 bearing dense bunches of bristles; maxillae rather long, broad in their 

 basal portion, transversely ribbed in the medial and denticulated in the 

 apical, the very apex being bare; maxillar palpi five-jointed, their first 

 and second basal joints amalgamated (pi. V, f. 5), third and fourth 

 nearly cylindrical, fifth obtuse, compressed and concave medially; la- 

 bium indistinct; labial palpi long, crescent-shaped, their first joint short, 

 second about seven times longer, nearly cylindrical, compressed, third 

 on a half shorter, widened at base and sharply pointed at apex. 



Thorax in its dorsal parts oblong,compressed(pl. V, ff.6 — 7); prono- 

 tum indistinct; cervical sclerites developed, horse-shoe-shaped; proscuta 

 (i. e. patagia; see p. 631, note 4) small, slightly separated from the body; 

 mesoscutum very large, elongated, convex, with indistinct medial line of 

 division; mesoscutellum well developed, laige, subquadrate, or rhombic ; 

 metascutum very large, irregularly cordiform, bearing two lateral rugose 

 elevations and a medial subquadrate rough area. Metascutellum dis- 

 tinct. Tegulae medium-sized and ordinary in form. Prosternum (pi. 

 V, f. 7) well developed and chitinized, excised on its distal margin 

 and with wing-shaped appendices laterally. Proepisternum well sepa- 

 rated. Mesosternum largely developed in all details: parasterna as its 

 lateral parts, peristerna contiguous on the medial line, and mesoster- 

 num triangular, lying between the mesocoxae. Mesepimerum and me- 

 sepisternum distinct and well separated. Metasternum largely develo- 

 ped, triangular, medially divided. Pro- and mesosternum joined freely 

 and movable, meso- and metasternum rather consolidated. Trochanti- 

 nus.of middle leg developed, those of fore and hind pairs indis- 

 tinct. Metepisternum distinct, Procoxae long, not very broad and not 

 covering mesosternal parts; meso- and metacoxae extremely large and 

 wide, covering the sternal parts of metathorax and basal sternites of 

 abdomen. Their subdivision into coxae and mera distinct. 



Revue Russe d'Entom. XV. 1915. № 4. 



