Nipponorhynchus brevis Smith & Naito, 2015

Smith, David R. & Naito, Tikahiko, 2015, Studies on Adelestini (Hymenoptera, Tenthredinidae), particularly the long-tongued Nipponorhynchus Takeuchi of Japan, Journal of Hymenoptera Research 45, pp. 1-14 : 3-5

Nipponorhynchus brevis Smith & Naito sp. n.

Figs 3 , 7 , 11 , 15 , 17 , 20 , 25 , 26

Description.

Female: Length 4.3 mm. Antenna and head black; anterior half of clypeus light brown, labrum and upper surface of maxillolabial complex white; palpi and undersurface of maxillolabial complex black. Thorax black with tegula and posterior corners of pronotum white. Legs black with apices of coxae, trochanters, apical quarter of femora, most of tibiae except about apical quarter with black stripe on inner surface; tarsi mostly black with inner surface of first two tarsomeres paler to white. Abdomen black; apical tergum and cercus white. Wings hyaline; veins and stigma black. Head shiny but roughened with scattered fine punctures, denser on genae, postocellar area, clypeus, and above toruli. Thorax and abdomen shiny; posterior margin of mesoscutellum with several large punctures.

Antennal length 1.3 × head width, with scape and pedicel each longer than broad; 3rd antennomere slightly longer than 4th, 4th to 9th antennomeres gradually decreasing in length. Clypeus slightly broadly, circularly emarginated, about 3 × broader than long. Malar space about equal to diameter of median ocellus. Lower interocular distance 1.3 × eye height; eyes only slightly converging below. Maxillolabial complex about 0.6 × head width and about 1.3 × eye height; maxillary palpus subequal to length of proboscis, longer than distance between maxillary palpus and labial palpus. Distances between eye and lateral ocellus, between lateral ocelli, and between lateral ocellus and hind margin of head as 1.0:0.8:0.5. Postocellar area 1.5 × broader than long. Posttergite distinct, long, rounded behind. Tarsal claws simple. Hind basitarsomere subequal to length of following 3 tarsomeres combined. Pulvilli minute on tarsomeres 1-4. Sheath in lateral view straight above, rounded at apex and below (Fig. 17 ); from above, equally wide throughout. Lancet (Fig. 20 ) with about 10 spines on basal two annuli and single row of about 6 spines on remaining annuli.

Male: Length 4.1 mm. Color and structure similar to female. Genitalia (Figs 25 , 26 ) penis valve with valviceps elongate and rounded at apex, dorsal spine broad.

Type material.

Holotype female "Japan: Hokkaido, Usubetsu, Sapporo, Ishikari, 42.9348°N, 141.1206°E, 29.IV-24.V.2012, small stream, Mal. trap, N. Kuhara" (NSMT). Paratypes: 4 ♀, 5 ♂, same data as holotype (NSMT, TN, USNM).

Distribution.

Japan (Hokkaido).

Etymology.

From the Latin brevis, meaning short, referring to the shorter mouthparts compared to the other species.

Comments.

The new species is separated from both N. mirabilis and N. bimaculatus by its shorter mouthparts. In N. mirabilis , the mouthparts are about 1.3 × head width and 3.0 × eye height (Fig. 1 ) and in N. bimaculatus , the mouthparts are about 1.0-1.1 × head width and 2.2 × eye height (Fig. 2 ). In Adelesta nova , the mouthparts are about 0.3 × head width and 0.4 × eye height (Fig. 4 ). It is also separated from N. mirabilis by the long maxillary palpus, which is longer than the distance between the maxillary palpus and labial palpus, and the longer more triangular posttergite, and from N. bimaculatus by the finely punctate head, which is very shiny in N. bimaculatus . The female lancet and male genitalia appear close to N. bimaculatus (Figs 19 , 20 , 23-26 ). In N. brevis , the lancet has the basal annuli more slanted and the annuli have fewer spines, and the male penis valve is more slender and has a broader dorsal spine. All females and males of N. brevis studied are of the same length.

This is the first record of Nipponorhynchus from Hokkaido. The host plant is unknown.

Figures

Figures 1 - 4. Head, front view. 1 Nipponorhynchus mirabilis 2 N. bimaculatus 3 N. brevis 4 Adelesta nova.

Figures 5 - 8. Head, lateral view. 5 Nipponorhynchus mirabilis 6 N. bimaculatus 7 N. brevis 8 Adelesta nova.

Figures 9 - 16. 9 - 12 Head, dorsal view. 13 - 16 Apex of mesonotum showing posttergite 9, 13 Nipponorhynchus mirabilis 10, 14 N. bimaculatus 11, 15 N. brevis 12, 16 Adelesta nova.

Figures 17 - 20. 17 Nipponorhynchus brevis, lateral view 18 - 20 Female lancets 18 N. mirabilis 19 N. bimaculatus 20 N. brevis.

Figures 21 - 26. Male genitalia. 21, 23, 25 Genital capsule, ventral view 22, 24, 26 Penis valve, lateral view 21, 22 N. mirabilis 23, 24 N. bimaculatus 25, 26 N. brevis.