Genus Phenacoperga Cockerell, 1908

Fig. 26.

Perga: Cockerell, 1907, p. 446, original description of P. coloradensis /misidentifiation of genus.

Phenacoperga Cockerell, 1908, p. 113 –114.

Type species. Perga coloradensis Cockerell, 1907 .

Emended diagnosis. Apparently distinct from other genera of Cimbicinae by antennae short (length ca. 1.2 × head width), subclavate, flagellomere 2 only twice as long as wide; 1-M, 1m-cu strongly divergent toward anterior margin; crossvein 2r-m slightly bent.

Remarks. The forewing venation of Phenacoperga agrees with Cimbicinae as its M+Sc-R junction is well separated from that of Rs+M, and the posterior anal vein 2+3A is complete, anal cells joined by crossvein 1a. In the key to Asiatic Cimbicidae of Wei et al. (2012), which includes all genera of Cimbicinae but Labriocimbex Yan & Wei, 2019, Phenacoperga keys to couplet 12 with Pseudoclavellaria Schulz, 1906 and Leptocimbex Semenov, 1896 but differs from both in its huge size, short and stout antennae and 1-M and 1m-cu strongly divergent toward anterior margin. Phenacoperga additionally differs from Labriocimbex and Pseudoclavellaria by its apparent absence of a rich vestiture, from Pseudoclavellaria by its ill-defined antennal club, and from Leptocimbex by its robust stature.