Revision of Ephydrini Zetterstedt (Diptera: Ephydridae) from the Americas south of the United States Author Mathis, Wayne N. Author Marinoni, Luciane text Zootaxa 2016 4116 1 1 110 journal article 274475 10.11646/zootaxa.4116.1.1 99249a81-fbb8-40be-8684-679b248a904c 1175-5326 257322 22D15539-E49E-4D6C-BFCF-D4DBC72BA640 2. Notiocoenia acutella Mathis Figs. 9–11 , Map 2 Notiocoenia acutella Mathis 1980 : 14 .— Mathis and Zatwarnicki 1995 : 249 –250 [world catalog]. Diagnosis. Although very similar to specimens of P. paniculata , specimens of this species may be distinguished by the following character states of the male preabdomen and terminalia: 4th abdominal sternite subrectangular, posterior margin truncate, setae at posterior margin slightly larger but not clumped; ventral margin of epandrium with conspicuous U-shaped medial emargination in posterior view; aedeagus more slender and with more distinct taper toward apex; gonite with acutely pointed process posteriorly. As in description of N. paniculata except as follows: Moderately small to medium-sized shore flies, body length 2.78–3.93 mm . Head: Gena-to-eye ratio 0.16–0.18; eye height-to-width ratio 0.86–0.89. Thorax: Legs tending to consistently be more yellowish orange, with little or no blackish coloration. Abdomen: Male sternite 4 subrectangular, posterior margin truncate, setae at posterior margin slightly larger but not clumped or clustered. Male terminalia ( Figs. 9–11 ): Epandrium in posterior view ( Fig. 9 ) as an inverted U, more thinly developed dorsally, in lateral view ( Fig. 10 ) conspicuously thinner dorsally, thereafter ventrally gradually becoming wider, widest at ventral 1/3, ventral 1/3 tapered to a rather bluntly rounded point; ventral margin, which is probably the fused surstylus, truncate with a conspicuous U-shaped medial emargination (best seen in posterior view); cerci free in cercal cavity, not fused with epandrium, semihemispherical; aedeagus in lateral view ( Fig. 11 ) elongate, slender, narrowly tubular, very gradually tapered to apical point; gonite well developed, with acutely pointed process posteriorly. FIGURES 9–11. Structures of male terminalia of Notiocoenia acutella Mathis. (9) epandrium and cerci, posterior view; (10) same, lateral view; (11) internal structures of male terminalia, lateral view (from Mathis 1980). Type material. The holotype male is labeled “ CHILE : Osorno Prov. [Termas de] Aguas Calientes ( 1 km SE) 530 m . elev. 7–8 Feb. 1978 WNMathis/ HOLOTYPE Notiocoenia acutella Mathis [handwritten, red].” The holotype is double mounted (minute nadel), is in good condition, and is deposited in the USNM (76067). The allotype female and 10 paratypes ( 6♂ , 4♀; DEI ) are labeled “Sud. Chile [Aisen] 14. 4. 40 . ( 14 Apr 1940 ) Puerto Puyuguapi [ 44°18'S , 72°32'W ] leg. G. H. Schwabe 201.” Other paratypes are as follows: CHILE : Coquimbo: El Pangue ( 30°26'S , 71°01'W ), 1 Nov 1954 , P. G. Kuschel ( 1♂ ; USNM ). Malleco: Perquenco ( 16.1 km N; 38°25'S , 72°23'W ), 1 Jun 1951 , A. E. Michelbacher, E. S. Ross ( 1♂ ; CAS ). Osorno: Anticura ( 1 km W; 40°39'S , 72°10'W ; 430 m ), 1–3 Feb 1978 , W. N. Mathis ( 1♂ ; USNM ). Type locality. Chile . Osorno: Termas de Aguas Calientes ( 1 km SE; 40°41'S , 72°21'W ; 530 m ). Distribution (Map 2). Neotropical: Chile (Coquimbo, Malleco, Osorno ), between 38°–44°S. MAP 2. Distribution map for Notiocoenia acutella Mathis.