Isostenosmylus

Ardila-Camacho, Adrian & Noriega, Jorge Ari, 2014, First record of Osmylidae (Neuroptera) from Colombia and description of two new species of Isostenosmylus Krüger, 1913, Zootaxa 3826 (2), pp. 315-328 : 326

Key to the species of Isostenosmylus

1. Basal third of forewing with a transverse brown band, obliquely extending from R1 to the posterior margin....... I. morenoi

- Forewing with different pigmentation pattern................................................................ 2

2. Hindwing with maculae between the C and R1; posterior wing margin brown infuscated................... .. I. nigrifrons

- Hindwing completely hyaline............................................................................ 3

3. Forewing strongly maculated............................................................................4

- Forewing weakly pigmented, with few maculae.............................................................. 5

4. Area between MP and posterior margin of the wing with an amber spot at level of the second Rs fork; male ectoproct in lateral view, posterodorsally with a prominent acuminate process; female gonocoxite VIII with apical lobes bilobed.... I. contrerasi

- Area between MP and 1A with an amber spot at the level of first Rs fork; male ectoproct in lateral view with posterior margin obliquely truncated; female gonocoxite VIII in ventral view, with apical lobes not bilobed................. I. pulverulentus

5. Forewing with numerous costal crossveins forked near to the costal margin..................... I. septemtrionalandinus

- Forewing with costal crossveins unforked or at least with few forks..............................................6

6. Forewing CuP with a conspicuous spot at level of first Rs fork; pterostigma conspicuously sclerotized; ectoproct in lateral view anterodorsally with a small triangular projection, posteroventrally with a rounded and produced lobe, posterodorsally strongly produced in a broad process.............................................................. I. fasciatus

- Forewing CuP with small spots; pterostigma sligthly sclerotized; ectoproct in lateral view, anterodorsally rounded with small protrusions, posteroventrally slightly produced and rounded, posterodorsally with an acuminate process......... I. fusciceps