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Bulletin De La Société Entomologique De France, 103 (3), 1998 : 273-286

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Bulletin De La Société Entomologique De France, 103 (3), 1998 : 273-286 Bulletin de la Société entomologique de France, 103 (3), 1998 : 273-286. Contribution à l'étude des Cératopogonidés de Suisse. Révision et redescription des espèces paléarctiques du genre Ceratoculicoides Wirth & Ratanaworabhan, 1971 (Diptera, Nematocera) par Jean-Claude DelÉcolle * et Karin Schiegg ** F -*Musée67000 Strasbourg.Zoologiqueforêt, la de **Chaireneige l'Université et lede paysage,la Louisprotection Pasteur1 1 1 Ziircherstrasse,de laet naturede la Ville et duCh de paysage, - Strasbourg8903 Birmensdorf,Institut (MZS), fédéral 29 Suisse bdde derecherches la Victoire, sur la Résumé. - Redescription du mâle et de la femelle de Ceratoculicoides havelkai Wirth & Grogan, 1988, redescription du mâle et première description de la femelle de C. tontoeguri (Havelka, 1980), espèces nouvelles pour la faune de Suisse. Mise en synonymie de C. moravicus Knoz, 1 987. Summary. - Contribution to the study of the Ceratopogonids of Switzerland. Revision and redescription of the palearctic species of the genus Ceratoculicoides Wirth & Ratanaworabhan, 1971 (Diptera, Nematocera). Redescription of the male and female of Ceratoculicoides havelkai Wirth & Grogan, 1988, redescription of the male and first description of the female of Ceratoculicoides tontoeguri (Havelka, 1980), new species for the Swiss fauna. Setting in synonymy of Ceratoculicoides moravicus Knoz, 1987. Mots clés. - Diptera, Ceratopogonidae, Ceratoculicoides, C. havelkai, C. tontoeguri, région paléarctique, faune de Suisse, Sihlwald. Les Cératopogonidés faisant l'objet de cette étude ont été capturés en 1996 et 1997 par l'un de nous (K.S.) dans la forêt du Sihlwald, près de Zurich (47°15'N, 8°33'E). Cette forêt de type humide, à exposition nord-ouest, située entre 400 et 700 m d'altitude, a été classée réserve naturelle en 1994. Les espèces arborescentes dominantes de cette forêt sont l'épicéa (Picea excelsa ) et le hêtre {Fagus sylvatica). Les captures réalisées dans le cadre d'une étude de la faune saproxylique, ont été effec¬ tuées à l'aide de deux types de pièges. D'une part, un modèle attractif "Trunk Window Trap" ou TWT (Kaila, 1993) et, d'autre part, un modèle à émergences "Baumstammeklektor" ou EK (Funke, 1971). Ces pièges, placés sur divers troncs de hêtres morts, ont permis de recueillir, pour cette seule famille, près de 6700 spécimens. L'étude de ces spécimens nous a permis d'identifier 58 espèces de Cératopogonidés appartenant respectivement aux genres Atrichopogon (9 spp.), Bezzia (1), Brachypogon (4), Ceratoculicoides (2), Ceratopogon (1), Culicoides (9), Dasyhelea (7), Forcipomyia (18), Kolenohelea (1), Palpomyia (4), Schizohelea (1) et Serromyia (1). La liste détaillée de ces espèces fera l'objet d'une note faunistique et écologique distincte (Schiegg & Delécolle). Parmi ces spécimens se trouvaient des représentants d'espèces peu ou mal connues. Nous n'étudierons dans ce premier travail que les espèces se rapportant au genre Ceratocu¬ licoides, réservant pour une publication ultérieure celles revenant aux autres genres. Les deux espèces que nous redécrivons ci-dessous, nouvelles pour la faune suisse, présentent les caractères généraux du genre Ceratoculicoides tel qu'il a été défini par WlRTH & Ratanaworabhan (1971). Toutes les dimensions, autres que la longueur totale de l'insecte, sont exprimées en micromètres sans que cette unité de mesure soit nécessairement rappelée. Elles concernent, dans l'ordre : la longueur des articles antennaires III-XV ; la longueur des articles du palpe 274 DELÉCOLLE & SCHIEGG - Les Cératopogonides de Suisse I+II et III à V ; la longueur de l'aile, de la costa et celle de la cubitale prises depuis l'arculus, la plus grande largeur de l'aile ; les longueurs respectives des fémurs, tibias, tarsomères et griffes des trois paires de pattes; la longueur et la largeur des spermathèques. L'indice antennaire (I.A.) indiqué pour la femelle est calculé en divisant la somme des longueurs des articles longs (XI-XV) par la somme des longueurs des articles courts (III-X) de l'antenne. Le rapport alaire (CR) est calculé en divisant la longueur de la costa par la longueur de l'aile. Ceratoculicoides havelkai Wirth & Grogan, 1988 (fig. 1 à 23) Ceratopogon gracilipes Remm, 1967 : 27 (<?, 9) ; Remm, 1974 : 57 (â, 9) ; Havelka, 1976 : 218 (â , 9) Ceratoculicoides gracilipes (Remm, 1967); WlRTH & Ratanaworabhan, 1971: 171-176 (n. comb., clé); Knoz, 1987:391 (clé) Ceratoculicoides havelkai Wirth & Grogan, 1988: 40 (n. nom pour gracilipes Remm, liste); Borkent & Wirth, 1997 : 95 (liste, synonymes). Ceratoculicoides remmi Gosseries, 1 989 : 2 (n. nom pour gracilipes Remm) ; Borkent & Wirth, 1 997 : 95 (n. syn.). Ceratoculicoides tontoeguri (Havelka, 1980): 86 (9 allotype). Mauvaise détermination. Ceratoculicoides moravicus Knoz, 1987 : 388 (cî, 9). N. syn. Mâle. - Longueur totale approximative : 1,6 mm. Tête. - Yeux pubescents, bien séparés, le vertex formant un large V dorsalement (fig. 1). Antenne (fig. 2): scape et pédicelle brun sombre; articles III-XIII d'un beige clair uniforme; articles XIV-XV un peu plus sombres et légèrement mouchetés. Article III à pédicule long ; articles IV-VIII de longueur et de largeur sensiblement décroissantes, bien séparés ; articles IX-XIII étroits, plus ou moins soudés ; article XIII long et cylindrique sur ses trois quarts distaux ; article XIV un peu plus gros, présentant un rétrécissement subbasal ; article XV gros, acuminé distalement. Soies du panache nombreuses, longues, implantées jusqu'à l'article XII ; articles XIII-XIV avec un verticille basai de 6-7 sensilla chaetica vigoureux; article XV avec 1 sensillum chaeticum subapical faible; articles III-VI avec 2 sensilla trichodea majeurs; articles IV-VII et X avec 1 sensillum trichodeum mineur; article XIII sans sensilla trichodea et sans sensilla basiconica ; articles XIV-XV avec des. trichodea et basiconica épars. Présence de 2-3 sensilla coeloconica sur l'article III. Mensurations: 101, 31. 29, 29, 26, 26, 26, 26, 29, 33 - 95, 79, 75. Longueur totale: 605. Clypéus en forme d'écusson plus large que haut, entièrement pubescent, portant de chaque côté 2-3 soies fortes, submédianes. Pièces buccales sans particularités. Palpe maxillaire (fig. 3) uniformément beige clair. L'article III, modérément grossi, présente dans la partie distale de son bord interne, une petite fossette sensorielle cylindrique, peu profonde, ornée d'organes claviformes dépassant très légèrement de l'ouverture. Mensurations : 46, 44, 24, 37. Longueur totale : 1 5 1 . Thorax (fig. 5). - Non observé à l'état frais. Mésonotum brun, très légèrement éclairci dans sa partie médiane ; scutellum et métanotum d'un brun sombre uniforme. Le mésonotum, à faible pilosité, présente en outre des petites dépressions circulaires centrées d'une spinule, disposées selon deux petites plages fusiformes submédianes. Le scutellum porte 4 soies faibles et 4 soies fortes, régulièrement alternées sur une ligne courbe transversale. Paratergite inerme. L'anépisternum (mésopleure) et le catépisternum (mésosternum) portent respectivement 2 et 3-4 soies longues. Aile (fig. 4) hyaline, complexe radial à peine différencié. Première cellule radiale fermée, la seconde petite et bien ouverte. Nervure M2 absente ou à peine visible. Quelques rares macrotriches dans la cellule r5, disposées le long du bord antérieur. Soies du complexe radial très rares, en générale 1 à proximité de l'arculus et 2 sur R2+3. Mensurations: Longueur: 1119, largeur: 381, costa: 524, cubitale: 547; CR: 0,46. Balanciers uniformément clairs. Pattes : pour les trois paires, fémurs, tibias et tarsomères d'un beige très clair, le dernier tarsomère étant légèrement bruni; genoux légèrement jaunâtres. Pilosité de l'ensemble des pattes peu dense et de faible longueur. L'apex du tibia antérieur porte un éperon bien développé et un petit peigne à peine visible ; l'apex du tibia médian ne porte ni peigne ni éperon. Le tibia postérieur, légèrement élargi à son apex, porte un petit éperon et deux peignes, le plus grand formé de 7 dents d'une longueur sensiblement égale. Epines tarsales des pattes antérieures: 1-2 faibles à l'extrémité des tarsomères I-IV ; - des pattes médianes : 2 à l'extrémité des tarsomères I-III, 1 à l'apex de IV; - des pattes postérieures: 3 sur le basitarse (1 à la base et 2 distales), 2 à l'extrémité des tarsomères II-III et 1 à l'apex de IV. Le basitarse postérieur porte en outre, comme celui de la femelle Bulletin de la Société entomologique de France, 103 (3), 1998 : 273-286 275 N 7 200 um f Fig.antennedroitgauche, 1 enà : vue5.?forme -à ventrale;droite.Ceratoculicoides générale - 4, (àaile; droite), havelkai - 5, représentationarticles Wirth XII-XIII & Grogan, schématique vus 1988:à un plusdeâ la(1-5), fortmoitié grossissement? (5).du thorax - 1, espace avec (à gauche) sesinteroculaire; ornements, ; - 3, palpe -S 2,à 276 DELÉCOLLE & SCHIEGG - Les Cératopogonides de Suisse (fig. 21), une série de soies courtes formant un peigne sur près des trois quarts de sa longueur. Griffes (fig. 10) petites, égales et brièvement bifides à leur extrémité, présentant à leur base, au niveau du talon, une soie, courbe et fine. Empodia petits et simples. Mensurations : 372 381 169 99 62 48 64. Griffes = 24 et 24 418 418 222 101 62 48 59 Griffes = 24 et 24 446 428 191 117 75 51 64 Griffes = 24 et 24 Abdomen. - Pince génitale (fig. 6). Sternite IX large, nettement échancré dans la partie médiane de son bord postérieur; entièrement recouvert d'une fine pubescence, débordant franchement sur l'échancrure. Tergite IX aussi long que les basistyles, transversal
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