Ilyobius flavicollis (Enderlein)

Liu, Xingyue, Hayashi, Fumio & Yang, Ding, 2015, Taxonomic notes of the Neotropical alderfly genus Ilyobius Enderlein, 1910 (Megaloptera, Sialidae), with description of a new species, Deutsche Entomologische Zeitschrift 62 (1), pp. 55-63 : 55

Taxon classification Animalia Megaloptera Sialidae

Ilyobius flavicollis (Enderlein) Figs 3, 15

Sialis flavicollis Enderlein, 1910: 380. Type locality: Colombia (Natagaima).

Re-description.

Female. Body length 12.0 mm; forewing length 14.5 mm, hindwing length 13.0 mm.

Head (Fig. 3) blackish brown, but dark orange on median portion of vertex, with dense brownish pilosity; vertex with few raised scars. Compound eyes blackish brown. Antennae blackish brown. Mouthparts brown.

Pronotum (Fig. 3) uniformly orange, other parts of thorax damaged. Only one foreleg preserved, blackish brown, bearing dense brownish setae. Wings smoky brown, with brownish veins. Forewing about 2.5 times as long as wide, with several transparent patches on proximal costal cells; costal area proximally distinctly dilated, with 10 distinct crossveins; sc-r present; Rs with two simple branches; MA with two simple branches; MP proximally fused with CuA, having simple anterior branch and bifurcate posterior branch; CuA bifurcated, CuP simple; 1A simple, 2A with two simple branches, 3A simple; three r-rs present. Hindwing about 2.5 times as long as wide; costal area proximally with four distinct crossveins; branching condition of longitudinal veins mostly same as that of forewing, except for MP having two simple branches; MA proximally leaving a short oblique veinlet fused with MP; M separated from R.

Abdomen damaged.

Type material.

Holotype ♀, "Columbien [= Colombia] (Natagaima [a town of Tolima Department, ca. 3°35'N; 75°05'W]), E[rnst]. Pehlke S./Type/ Sialis flavicollis Enderl[ein]. ♀, Type, det. Dr. Enderlein" (MZPW).

Distribution.

Colombia (Tolima).

Remarks.

Ilyobius flavicollis is the type species of the genus Ilyobius . Unfortunately, the primary type of Ilyobius flavicollis is largely damaged with the abdomen lost. Nevertheless, Ilyobius flavicollis is highly possible to be the same genus with the other Neotropical alderflies based on the alternately black-orange body coloration and the wing venations with two simple Rs branches and a bifurcated posterior branch of MP. The cephalic color pattern of Ilyobius flavicollis is different from all the other Ilyobius species, suggesting that this species should be valid.