Tylostega Meyrick, 1894

Du, Xicui & Li, Houhun, 2008, A review of Tylostega Meyrick from Mainland China (Lepidoptera, Crambidae, Spilomelinae), with descriptions of four new species, Zootaxa 1681, pp. 51-61 : 52

Tylostega Meyrick, 1894

Tylostega Meyrick, 1894: 457 .

Type species: Tylostega chrysanthes Meyrick, 1894

Diagnosis. Adult: Antenna ciliate ventrally in male. Labial palpus upturned and curved; 3rd segment exposed. Maxillary palpus filiform. Forewing in male with depression in cell containing a small flat scale­tuft above, and covered with dense pecten of scales beneath ( Fig. 6 ); CuA1, M3 and M2 approximated towards base, R5 curved to R3+4 at base, R2 anastomosed with or closely approximated to R3+4. Hindwing with CuA1, M3 and M2 closely approximated towards base, Rs anastomosed with Sc+R1 to middle ( Fig. 7 ). Male genitalia: Uncus triangular, with bluntly rounded posterior margin; valva with projection medially; phallus cylindrical, short. Female genitalia: Apophysis anterioris longer than apophysis posterioris; ostium developed; ductus bursae more sclerotized at base than the remaining part.

Distribution. China, Korea, Japan, India, Borneo and Russia (Far East).

Remarks. This genus is similar to Lamprosema , but can be differentiated by the male forewing with a depression in the cell containing a small, flat scale­tuft above, and bearing a dense pecten of scales beneath, the forewing with R5 curved to R3+4 at base, and R2 anastomosed with or closely approximated to R3+4.

Figures

FIGURES 6 – 7. Depression with special scales in cell of forewing and wing venation of Tylostega tylostegalis (Hampson). 6 a. depression containing a small flat scale­tuft above; 6 b. dense pecten of scales beneath; 7. wing venation.