— 646 — 



wide tube, with its dorsal part consisting of tenth tergite and ven- 

 tral of tenth sternite; this latter abnormally developed, strongly chili- 

 nized and fused laterally, by means of indistinct pleurites, with 

 tenth tergite, forming thus a complete tube. Subanal structures 

 highly peculiar. Two lateral processus (pleurites?) descending from 

 the anal portion of the tenth sternite, fused together ventrally and 

 forming thus a complete subanal ring, bear two peculiar spoon-like 

 appendages, covered laterally, each, with nine rows of pectinated chi- 

 tinous combs. These appendages should be considered only as a highly 

 specialized subscaphium. Uncus not developed, in the form of a dis- 

 tal thickening of tenth tergite, rather bilobed, with many strong curved 

 setae on its margin. Valvae circular, flat, membranous, covered with 

 fine long hairs. Fultura superior in form of two bilobed and haired 

 papillae. Fultura inferior in form of a large and wide horse-shoe-shaped 

 plate, strongly chitinized, produced into two lateral processus, on the 

 sides of penis, and furnished with four strong teeth on each of them. 

 Penis regular, cylindrical, equal in length to the tenth tergite, incrassa- 

 ted on its distal and funnel-like widened on oral portions. Coecum pe- 

 nis absent. Vallum penis broadly conical, rounded distally. 



Female abdominal segments (pi. VI, ff. 15 — 16) not specialized. 

 Ostium bursae lying between the seventh and eighth sternites, or more 

 exactly, at the praesegmental margin of the eighth. Lamella antevagina- 

 lis bilobed, rugose, punctured, divided medially into two triangles. 

 Papillae anales and apophyses posteriores large and developed. Bursa 

 copulatrix bag-like, elongated, slightly narrowed in the middle, enti- 

 rely membranous, with many folds. Lamina dentata situated dorsally, 

 a little asymmetrically, in the form of a slender, pointed, somewhat 

 curved cone, densely denticulated on its outer surface. Ductus bursae 

 rather chitinized and forming two left spires. 



Egg not discovered. Larval instars found four in number, two 

 of them mining in leaves, two others boring in stalks and shoots. 



Adult larva (pi. VII, f. 18), probably, fourth instar, measuring 

 about 9—10 mm in length, cylindrical, with thoracic segments but slightly 

 enlarged. Color of alcoolic specimens dirty white, epicranium yellow- 

 brown. All body segments, markedly separated, naked and furnished 

 only with primitive setigerous tubercles. Thoracic legs fully develo- 

 ped, prolegs normal, on segments third, fourth, fifth, sixth and tenth. 

 Pronotum rather membranous, as well as tenth tergite. 



Epicranium of the adult larva (pi. VII, f. 20) oval, prognathic, 

 slightly excised on occiput and between this latter and the postgenae 

 (pi. VII, f. 18); hemisphaerig, semicircular, with sutura metopica well 

 marked; epistomum in form of a high triangle, limited by the lamb- 

 doid line; fronto-lateral sclerites margined by the deltoid suture rather 



Revue Russe d'Entom. XV. 1915. № 4. 



