Oreiallagma gen. nov. with a redefinition of Cyanallagma Kennedy 1920 and Mesamphiagrion Kennedy 1920, and the description of M. dunklei sp. nov. and M. ecuatoriale sp. nov. from Ecuador (Odonata: Coenagrionidae) Author Ellenrieder, Natalia Von Author Garrison, Rosser W. text Zootaxa 2008 1805 1 51 journal article 10.5281/zenodo.182666 d1698b4a-ec6b-4a5f-96cf-956535545e85 1175-5326 182666 Oreiallagma prothoracicum ( Kimmins 1945 ) comb. nov. Figures 8 b; 25; 53; 87; 92; 104 Telagrion prothoracicum Kimmins 1945 : 187 –189, figs. 1A–C (description of male, illustration of S10, and posterior lobe of prothorax). St. Quentin 1960 : 48 (in key for males). Kimmins 1970 : 190 ( type catalog BMNH). Leptagrion prothoracicum Santos 1965 : 9 (transfer to Leptagrion ). Davies & Tobin 1984 : 82 (synonymic list). Garrison 1991 : 13 (synonymic list). Bridges 1994 : VII.191 (synonymic list). Steinmann 1997 : 310 (synonymic list). Tsuda 2000 : 38 (synonymic list). Costa & Garrison 2001 : 384 (mention). Types : ɗ holotype in BMNH (examined) with following data: "Intaj [Imbabura Prov.] / Ecuador [in ink]"; 3 ɗ paratypes in BMNH (examined). Characterization. Medial lobe of posterior lobe of prothorax heart-shaped, markedly constricted at base, with moderate medial concavity on posterior margin, and each lateral lobe bilobate ( Fig. 25 ; as in O. thelkterion ). Distal segment of genital ligula ( Fig. 53 ) approximately as wide at apex as at base, with a pair of lateroapical lobes each of which are not recurved and are directed distally (unique), a pair of small accessory lateromedial lobes (as in O. quadricolor ), and one ental sclerotized transverse fold (unique, Fig. 53 c; one non-sclerotized fold in O. oreas , Fig. 52 c). Dorsal process of male cercus shorter than ventral process, approximately triangular and directed postero-dorsally in lateral view (unique; Figs. 87 ; 92). Dorsum of S1 orange yellow; of S2–5 orange yellow with posterior black margin; of S6 brown; of S7 black; of S8 blue with lateral black longitudinal stripe on anterior 2/3; of S9 blue; of S10 black. Female unknown. Diagnosis. This species, the largest of the genus, is unique by cercus morphology: the dorsal process is small, acute, and apical ( Figs. 87 ; 92); in O. quadricolor the dorsal process is also short and acute, but it is sub-apical ( Figs. 88 a; 93). The short latero-apical lobe of distal segment of genital ligula ( Fig. 53 b) is shared only with O. oreas ( Fig. 52 b), but in the latter species there is a pair of contiguous latero-apical lobes on each side ( Fig. 52 a). Medial lobe of posterior lobe of prothorax is constricted basally and each lateral lobe is bilobate ( Fig. 25 ); O. thelkterion ( Fig. 29 ) is the only other species with bilobate lateral lobes, but its medial lobe is broader than in O. prothoracicum . Biology. Unknown; see remarks under generic account. Distribution. Ecuador (Imbabura province), at 2000 m above sea level ( Fig. 104 ).