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^Ten new species of Docalidia are described and illustrated. These are pennyi, gracilitas, zanoli, triquetra, paracrista, convexa, setacea, and caterva from Brazil and vesica and vella from Peru. A key to males of 37 species described since the last revision of the genus is included. The number of known species is now 116, making Docalidia the largest teruliine genus. Since the treatment of the genus Docalidia in a revision of the tribe Teruhini (Nielson 1979), several new species in the genus have been described (Nielson 1982a, 1982b, 1982c). In this paper 10 additional new species are described and illustrated, bringing the total to 116 known species in this the largest of the teruhine genera. The richness of the fauna of this group in South America (only one species known in Central America and one in the West Indies) is staggering. The number of known species prior to 1979 was 21 and since then the number has increased nearly 600%. Most of the new species described herein and in earlier papers were the result of collections made during the last 20 years. As new areas of tropical America become more accessible and collections more extensive, many new species of Docalidia will be found. Docalidiine leafhoppers are small to medium-sized, robust species with short, broad heads. The crown is short, broad, depressed, but usually not carinate, and the pronotum is noticeably inflated in many species. A very well-developed median clypeal carina distinguishes this group from other similar appearing genera that usually have a weakly developed clypeal carina. The long, usually slender, aedeagus with or without a single subapical ventral spine, simple to ornate style and 10th segment processes, and the broad plate will readily distinguish the group from all other teruliine genera. A key to males of 37 species not previously keyed is given to accommodate species described here and in my three earlier papers cited above. The remainder are keyed in my 1979 paper. Hosts and biology of these leaflioppers are poorly known. Paucity of populations accounts for the lack of knowlege of their bionomics and importance to agriculture and silviculture in the tropics of the new world. Key to Males oi Docalidia 1. Style simple, without spines or setae 2 — Style ornate, with spines and/or setae present 6 2(1). Style filamentous in distal half 3 — Style broad in distal half 4 3(2). Pygofer with small caudoventral lobe (Fig. 1); aedeagus with subapical spine (Fig. 3) caterva, n. sp. — Pygofer with very long broad caudoventral process (Fig. 19, Nielson 1982b); aedeagus without subapical spine (Fig. 23, Nielson 1982b) exilis Nielson 4(2). Aedeagus with subapical spine; pygofer with caudodorsal process bifurcate or rounded distally 5 — Aedeagus without subapical spine (Fig. 83, Nielson 1982a); pygofer with caudodorsal process single and pointed (Fig. 79, Nielson 1982a) glabra Nielson 5(4). Pygofer with caudoventral process very long and lobelike, apex rounded (Fig. 1, Nielson 1982a) lobata Nielson — Pygofer with caudoventral process short, narrow, curved mesally and pointed apically (Fig. 31, Nielson 1982a) hansoni Nielson 6(1). Style with 1-3 spines in distal half to third . . 7 — Style with numerous spines and/or setae in distal half to third 9 7(6). Aedeagus with subapical spine (Fig. 17, Nielson 1982a); style with single, terminal spine (Fig. 14, Nielson 1982a) nuda Nielson Monte L. Bean Life Science Museum, Brigham Young University, Provo, Utah 84602.

New South American leafhoppers in the genus Docalidia, with a key to 37 species (Cicadellidae: Coelidiinae, Teruliini)