Dilyta rathmanae Menke & Evenhuis

Paretas-Martínez, Jordi, Ferrer-Suay, Mar, Kovalev, Oleg, Melika, George, Selfa, Jesús & Pujade-Villar, Juli, 2011, Revision of the Holarctic species of Dilyta Förster (Hymenoptera: Figitidae: Charipinae) with descriptions of four new species from the eastern Palaearctic, Zootaxa 2780, pp. 29-38 : 34-35

Dilyta rathmanae Menke & Evenhuis

Dilyta rathmanae Menke & Evenhuis, 1991: 153 .

Type material studied. USNM: 12 paratypes with the following labels: 2Ƥ: “Washington: Chelan Co. 13Km N. Wenatchee. Nahahum Canyon nr. Wenatchee River (elev. 180m).Ex: Cacopsylla alba on Salix exigua Coll.R.J. Rathman ” “Washington: Chelan Co., Wenatchee River 8-VIII-1986 R. Rathman on Salix ” “James Entomol. coll. Voucher specimen 86-2-5 ” “ Paratype Dilyta rathmani Menke & Evenhuis” (Yellow label). 1Ƥ: “Washington: Chelan Co. 13Km N. Wenatchee. Nahahum Canyon nr. Wenatchee River (elev. 180m). Ex: Cacopsylla alba on Salix exigua Coll.R.J. Rathman ” “Washington: Chelan Co., Wenatchee River 8-VIII-1986 R. Rathman on Salix ” “James Entomol. coll. Voucher specimen 86-2-9 ” “ Paratype Dilyta rathmani Menke & Evenhuis” (Yellow label). 1Ƥ: “Washington: Chelan Co. 13Km N. Wenatchee. Nahahum Canyon nr. Wenatchee River (elev. 180m). Ex: Cacopsylla alba on Salix exigua Coll.R.J. Rathman ” “Washington: Chelan Co., Wenatchee River 8-VIII-1986 R. Rathman on Salix ” “James Entomol. coll. Voucher specimen 86-2-10 ” “#1 on slide” “ Paratype Dilyta rathmani Menke & Evenhuis” (Yellow label). 1Ƥ: “Washington: Chelan Co. 13 km N. Wenatchee. Nahahum Canyon nr. Wenatchee River (elev. 180m). Ex: Cacopsylla alba on Salix exigua Coll.R.J. Rathman. ” “Washington: Chelan Co., Wenatchee River 31-V-1986 R. Rathman on Salix exigua em. 18-VI-1986 ” “ James Entomol. coll. Voucher specimen 86-2-11 ” “#4 on slide” “ Paratype Dilyta rathmani Manke & Evenhuis” (Yellow label). 1Ƥ: “Washington: Chelan Co. 13Km N. Wenatchee Nahahum Canyon nr. Wenatchee River (elev. 180m). Ex: Cacopsylla alba on Salix exigua Coll.R.J. Rathman ” “Wenatcheevalley Washington VIII-19-1985 R.J. RATHMAN” “ Paratype Dilyta rathmani Menke & Evenhuis” (Yellow label). 1Ƥ: “Washington: Chelan Co. 6.6 km S. Cashmere Yaxon Canyon McManus Orchard (elev. 242m) Beating tray sample from pear. Coll. G.S. Paulson” “Cashmere, WA Yaxon Canyon McManus Orchard Spec. ID: 7080 18 June 1987 ” “Beating Tray” “Coll. G.S. Paulson Ex: PEAR ” “7080” “ Paratype Dilyta rathmani Menke & Evenhuis” (Yellow label). 1Ƥ: “ 8-VII-87 Dryden, WA. Spec. ID: 7109” “Coll. G.S. Paulson Ex: PEAR ” “7109” “ Paratype Dilyta rathmani Menke & Evenhuis” (Yellow label). 2Ƥ, 13: “WASHING- TON: Chelan. Co.: Dryden 8-VII-1987 G.S. Paulson” “ Paratype Dilyta rathmani Menke & Evenhuis” (Yellow label). 1Ƥ: “WASHINGTON: Chelan. Co.: Dryden 8-VII-1987 G.S. Paulson” “ Paratype Dilyta rathmani Menke & Evenhuis” (Yellow label) “Ƥ Det. Menke 198”.

Diagnosis. Similar to D. aleevae n. sp. in having distal area of metasoma smooth without punctures. Differs from D. aleevae n. sp. in proportions of antennal segments (see key). All other Holarctic species of Dilyta have distal area of metasoma punctate.

Redescription. Length: 0.9–1.2 mm.

Colour: Black except antenna and legs yellow, apical half of flagellum and mid and hindlegs sometimes suffused with brown.

Antennae (figs. 3A, 4A): Female. F1 shorter than pedicel, F1 almost double length of F2, F3 and F4, F2 and F3 subequal to F4 but sometimes F2 seems slightly shorter than F3 and F4, F5 longer than F4, F5 shorter than F1, F6 longer than F5 (Proportions F1–F6: 5.5:3:3.5:3.7:4.7:6.5), F7 longer than F6; F7–F11 wider than previous segments, antenna slightly clavate from F6; sensilla beginning on F6. Male. F1 as long as pedicel and slightly arched, F1 longer than F2 and F3, F2 slightly shorter than F3, F4 longer than F3, F1 subequal to F4, F4 thiner than F1; F4– F12 wider than previous segments, antenna slightly clavate from F4; sensilla beginning on F4.

Metasoma: Distal half smooth, without punctures (a few scattered pits are present in most specimens of D. rathmanae but they are very shallow and barely visible even in photomicrographs (Menke & Evenhuis 1991)). Biology. Hyperparasitoid of psyllids through an encyrtid, Trechnites sp ( Hymenoptera : Chalcidoidea: Encyrtidae ). Reared from Cacopsylla alba (Crawford) ( Hemiptera : Psyllidae ) on Salix exigua L. ( Salicaceae ) and C. pyricola (Förster) ( Hemiptera : Psyllidae ) on pear orchards ( Menke & Evenhuis 1991).

Distribution. USA (Washington State).