Tylostega Meyrick

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

Key to the species of Tylostega Meyrick of Mainland China based on male genitalia

1 Juxta concave on posterior margin, protruding posterolaterally ................................................................ 2

­ Juxta not obviously concave on posterior margin, with strong hornlike process mediolaterally or with fin­ gerlike process posterolaterally ................................................................................................................. 3

2 Sacculus with dorsal margin strongly arched, with small teeth and toothlike processes; phallus with two shorter and one longer spinelike cornuti ............................................................. T. tylostegalis (Hampson)

­ Sacculus with dorsal margin concave at basal 1/3, smooth; phallus with one stout spinelike and one den­ tate cornuti ...................................................................................................................... T. serrata sp. nov.

3 Juxta with strong hornlike process mediolaterally; phallus with two spinelike and one luniform cornuti .. ...................................................................................................................................... T. luniformis sp. nov.

­ Juxta with strong fingerlike process posterolaterally; phallus with two spinelike and one pectinate or one broadly boardlike cornuti ........................................................................................................................... 4

4 Phallus with two spinelike and one pectinate cornuti .................................................. T. pectinata sp. nov.

­ Phallus with two spinelike and one broadly boardlike cornuti ............................................ T. lata sp. nov.