Metrodorinae, Bolivar, 1887

Cadena-Castañeda, Oscar J., Quintana-Arias, Ronald Fernando, Infante, Ivette Coque, Silva, Daniela Santos Martins & Tavares, Gustavo Costa, 2025, Studies on pygmy grasshoppers: On the current Metrodorinae sensu lato classification (Orthoptera: Tetrigidae) with emphasis on American and Malagasy taxa, Zootaxa 5597 (1), pp. 1-265 : 10-11

Key to tribes of Neotropical Metrodorinae

1. Body depressed dorso-ventrally ( Figs. 121A, 122A, 125A). Vertex not projected between the eyes, slightly tapering and truncated anteriorly ( Figs. 121B, 123B, 124B). Mid-femur strongly expanded, dorsal and ventral margins of mid-femur lobed or foliaceous ( Figs. 121F, 123F). Species camouflage frequently resembling lichens or bryophytes........... Amorphopini

- Body not depressed dorso-ventrally ( Figs. 1A, 15A, 59). Vertex variable in shape, projected or not between the eyes ( Figs. 1D, 51B). Mid-femur thin, not strongly expanded, dorsal and ventral margins of mid-femur without lobes or foliaceous ( Figs. 10E, 43E). Species rarely camouflage between lichens or bryophytes................................................ 2

2. Vertex whole expanded “horn-like” ( Figs. 77B, 78B). Head in lateral view strongly oblique ( Figs. 77D, 78A, 80B), and in frontal view, scutellum very narrow ( Figs. 77C, 80A). Fore and mid femora with almost straight upper and lower margins ( Figs.80D, E). Lower margin of the lateral lobes of the pronotum poorly projected to the sides and without any type of armature ( Figs. 80C, 81B, 83B)............................................................. Metopomystrini trib. nov.

- Vertex not prolonged as a whole; if any head extension is observed, it is only the extension of the medial carina of the vertex, which is mostly wide in frontal view; scutellum variable ( Figs. 1D, 10A, 29A). Fore and mid femora with undulated upper and lower margins ( Figs. 10D, 22D, 29D). Lower margin of the lateral lobes of the pronotum moderately or well-projected towards the sides, with variable shapes, generally triangular, with or without spines ( Figs. 29C, 45C, 57C, 67C, 74C)............. 3

3. Carinae of the vertex not produced at all, and medial carina low ( Figs. 108B, 120A). Frontal costa straight and scutellum narrow ( Figs. 102C, 104C, 105C, 112C)......................................................... Otumbini trib. nov.

- Carinae of the vertex produced in different levels, mostly conspicuous, with lateral carinae forming more or less pronounced horns and medial carina visibly compresso-elevated ( Figs. 1A, 16B, 29B). Frontal costa rounded or divergent, rarely straight ( Figs. 1D, 16A, 29A).................................................................................. 4

4. Vertex almost 1.5 times wider than the eye, medial carina not strongly expressed, and vertex usually concave ( Figs. 85E, 86C, 89C). Scutellum narrow ( Figs. 87C, 91C, 97A). Median carinae of pronotum slightly elevated in some sections, pronotal disc mostly flat but with mid-sized undulations ( Figs. 86A, 89A, 91A, 96A). Most species slender and winged.............................................................................................. Garciaitettigini trib. nov.

- Vertex approximately two times (or more) wider than the eye, medial carina strongly expressed, and vertex convex ( Figs. 1D, 16A, 29A). Scutellum mostly wider (rarely narrow) ( Figs. 7A, 22A, 34A). Median carinae of pronotum arcuate, mostly forming a crest in different shapes ( Figs. 10B, 16B, 22B). Most species robust and apterous....................... Metrodorini