Chelonus cylindrus
author(Klug, 1816)
synonymsChelonus speculator Marshall, 1885, Chelonus macrocerus Thomson, 1874, Chelonus variabilis Herrich-Schäffer, 1838
body
shape2 1/3 lin. [N]. ♀ 4.9- 5.8 mm, ♂ 5.1-5.5 mm [P2]. 4.8-5.5mm [Zh1].
colorblack [N]
head
shapeTemples somewhat dilated [M]. Head in dorsal view transverse, 1.9-2.0 x as broad as long, eye nearly 1/3 longer than temple, latter receded rounded. Ocelli small and round, POL : OD : OOL as 10: 4: 14. Eye in lateral view 1.75x as high as wide, eye and temple of equal width. Malar space about as long as basal width of mandible. Inner margin of eyes indistinctly convergent ventrally [P2]. Face evenly convex, clypeus truncated in the middle of the front edge [Zh1].
sculptureHead reticulate-rugulose, orbits and temples striolated; frontal fovea deep, rugulose, shining [M]. Head rugose, occiput and temple rugo-striate [P2]. Face with fine reticular rugae; Clypeus densely covered with white hairs, punctated [Zh1].
colorpalpi dusky; mandibles at the tip yellow-brown [M]. Palpi brownish [P2].
antenna
shape ♀Antennae ♀ with 27 segments, widened beyond the middle and only slightly attenuated towards the apex, hardly shorter than the body and much longer than those of C. inanitus ♀ [M]. 28 segments [Th]. 28-29 segments [H]. Antenna with 27-31 segments, about as long as head + mesosoma + 0.5 carapace. 3rd segment 2.5x as long as broad apically and penultimate segment cubic [P2]. 28-30 segments, thickened from the middle; the middle segment is obviously wider than the last two segments, the length of each antennae segment is less than the width. The last segment length is slightly larger than wide [Zh1].
shape ♂29 segments [N]. 29-32 segments [P2]. Slender, not thickened from the middle, 33 segments [Zh1].
color
mesosoma
shapePropodeum with 4 teeth [N]. Propodeum longer [than inanitus], subquadridentate. Anterior edge of the mesosternum not reflexed [M]. Mesosoma in lateral view 1.5x as long as high [P2]. Propodeum with a thin transverse carina and inconspicuous denticles on both sides [Zh1].
sculptureScutellum finely, densely punctated, subrugulose. Propodeum reticulate-rugose, large irregular areas [N]. Scutellum shining in the middle. Propodeum more coarsely reticulated [M]. Mesonotum with fine reticular rugae, slightly shiny. Coarse reticular rugae before scutellum. Mesopleurae finely reticular-rugose, propodeum reticular-rugose [Zh1]. Notauli weakly distinct by crowded sculpture. Mesosoma rugose. Scutellum medially punctate, laterally with a few rugae, interspaces shiny [P2].
color
legs
shapeHind femur 3.1-3.9x, usually 3.75-3.9x, as long as broad medially. Pair of spurs of hind tibiae inequal in length, inner (or longer) spur 0.5 as long as basitarsus, hind basitarsus as long as tarsomeres 2-4 [P2].
sculpture
colorLegs red, coxae, trochanters and base of femora black. Tarsi and tip of hind tibiae dark [N]. Legs brownish-yellow; coxae, fore femora at the base, 4 posterior wholly except the tips, and tips of the hind tibiae, black ; these last slightly brownish at the base, their tarsi blackish with the 1st segment brownish-yellow; spurs pale [M]. Legs reddish yellow, coxae and trochanters black to brownish black, tarsomeres 2-5 darkening brownish fumous [P2]. Base of legs black; femura and tibiae are reddish-yellow; the hind tibia is yellowish brown; tarsi dark. A few specimens have dark brown hind legs [Zh1].
wings
shapeSR1 curved; radius of the hind wings sinuated. wings 4 lin. [M]. Fore wing 1/6 shorter than body. Pterostigma 3.5x as long as wide, issuing radial vein distally from its middle, R1 as long as pterostigma;1-R1 somewhat shorter than pterostigma, r 0.2x shorter than 3-SR, SR1 faintly S- formed [P2].
colorWings infumated, with a reddish-brown tinge, and a darker stain underneath the dark stigma; parastigma and basal veins brownish-yellow, the rest dark; tegulae black [M]. Tegula brown. Wings weakly fumous (or subhyaline), pterostigma brown, veins proximo-distally opaque yellow to brownish. [P2]. Veins on basal half yellow, distal veins dark brown [Zh1].
metasoma
shapeMetasoma cylindrical, with two distinct basal carinae, standing out from network of rugae [N]. Metasoma without basal carinae [M]. ♂ Carapace in dorsal view 2-2.3x as long as broad posteriorly, ♀ (1.9)2-2.1 x as long as broad posteriorly. Carapace in dorsal view cylindriform, apically rounded; in lateral view (Fig. 4) 2.66x as long as posterior height, posteriorly rounded (indicated by the upper arrow) and just incurved (indicated by the lower arrow); cavity in ventral view almost as long as carapace itself [P2]. The metasoma is long oval, parallel on both sides; in dorsal view length 2.0-2.2 times the width; the metasoma is slightly curved inward [Zh1].
sculptureReticulate-rugulose [N]. Carapace anteriorly with longitudinal strio-rugosity, posteriorly rugo-rugulose, subshiny (Fig. 3) [P2]. metasoma with rough net-like rugae, sculpture more finely at the apex [Zh1].
colorTwo basal yellowish-transparent spots [N]. With 2 large triangular yellowish spots at the base of the metasoma [M]. Carapace always with a pair of lemon yellow maculae basally [P1]. The base of the metasoma has yellow oval spots on both sides [Zh1].
♀ ovipositorovipositor hidden [M]. Ovipositor sheath short and concealed [P2].
♂ aperture
other info
distributionCH, DE, GB, NL, SE [FE].
remarksThe main difference between Ch. carbonator I Ch. humilis and Ch. cylindrus is restricted to their colour. Perhaps the three forms compose a single species having light and dark coloured varieties [P1].
hostsSpodoptera mauritia; Laspeyresia cacoecia; Crambus luteelus; Laspeyresia janthinana; Puchynemutus scutellatus; Tortrix diversana; Pristiphora abietina [Zh1].
