Laricobius naganoensis, Leschen, Richard A. B., 2011

Leschen, Richard A. B., 2011, World review of Laricobius (Coleoptera: Derodontidae), Zootaxa 2908, pp. 1-44 : 19-20

14. Laricobius naganoensis n. sp.

(figs 14, 29, 30, 43)

Diagnosis. Body bicolored. Head dark; ocelli absent. Prothorax transverse with well developed lateral carina and sides explanate. Pronotum dark; posterior tooth absent. Scutellum dark. Surface of elytra usually incurvate; elytral punctures not confluent. Epipleura dark. Ventrites dark. Femora dark. Tibiae light. Aedeagus with median carina on phallobase; medium lobe acute; apices of parameres without an internal ridge.

Description. Length 2.40–2.84 mm (x = 2.58, n = 9). Body bicolored with head, prothorax, scutellum, elytra along sides to level of abdominal ventrite 3 (usually covering striae 7–10) and usually along suture and scutellary striole (but may be reduced to the area surrounding the scutellum), epipleuron, venter, and usually the femora chocolate brown; elytra orange-red to dark or reddish tan; antenna reddish brown to dark brown with AI and club usually darker, palpi, and tibiae light to reddish brown, tarsi lighter. Head without ocelli; u-shaped furrow present; interocular distance about 4x the width of the eye; macropunctures rounded and distinct to indistinct and shallowly impressed, scattered and present at the center of dronsf; micropunctures coarse; setae erect, moderately elongate with an average length as long as 2/3 to full width of the eye. Antenna with length of A3 about equal to A4, ratios 1.8:1.5:1.3:1.2:1.2:1.1:1.1:1.0:1.2:1.3:1.9; A11 not strongly asymmetrical. Prothorax transverse and rectangular, dorsoventrally flattened, and widest at middle, sides weakly convex, converging anteriorly from widest point and weakly convex or convergent posteriorly; about 0.74 x as long as wide (pronotal length/greatest pronotal width = 0.67–0.77, x = 0.74); depth = 0.28–0.44 mm (x = 0.37); pronotum laterally broadly explanate, lateral carina with a distinct sharp edge; anterior angle 90º to about 80° and subacute, not forming a tooth; posterior angle indistinct, rounded, and without a short tooth; foveae visible in dorsal view; macropunctures on disc distinct, usually weaklyimpressed and well-separated; micropunctures strong; setae erect, moderately long and 2/3 to full width of eye. Elytra about 3.41 x as long as wide (elytral length/greatest elytral width = 3.13–3.73, x = 3.41) and 3.39 x as long as pronotum (elytral length/pronotal length = 3.13–3.71, x = 3.39); surface weakly incurvate at basal third; macropunctures not coalescing to form grooves, separated by 1/2 puncture diameter; micropunctures fine; microsculpture not visible; setae suberect to subdecumbent, short and on average about 2/3 length of the eye. Aedeagus with phallobase slightly elongate (longer than wide), about 2/3 the length of the median lobe, median carina present; median lobe projecting very slightly beyond apices of parameres, relatively narrow with its greatest width larger than the width of the parameres, apex acute and attenuate, median groove and carina absent, ostium subapical; parameres slender and acute, very short setae present on apices and along inner margin, internal subapical ridge absent. Spiculum gastrale apically narrow.

Comments. Laricobius naganoensis can be distinguished from most species by the lack of ocelli. It can be reliably distinguished from the remaining species that lack ocelli by having pale tibiae and the acute median lobe of the male genitalia. Laricobius naganoensis can also be distinguished from these species, as well as the sympatric species L. osakensis , by the more vivid orange-red coloration of the elytra.

This new species is based on specimens collected from relatively high altitude areas in Nagano Prefecture where it is sympatric with L. osakensis .

Hosts. Plant: Tsuga diversifolia (Maxim.) Mast. Adelgid : Adelges tsugae .

Distribution. Japan: Honshū.

Type material examined. HOLOTYPE ( OMNH): JAPAN Nagano Prefecture Ootaki Mt Ontake 35.86938 N 137.51064 E 2050 m 29 October 2009 A. Lamb S. Shiyake/Beaten from Tsuga diversifolia Havill Sample # 09- 215.7/ HOLOTYPE Laricobius naganoensis design. R. Leschen 2010.

PARATYPES: 1, JAPAN Nagano Prefecture Matsumoto Mt. Norikura 15 October 2008 Coll.: S. Shiyake A. Lamb Beaten from Tsuga diversifolia male Havill sample 08-291.1 (genitalia mounted separately on microslide, YPM); 1, JAPAN Nagano Prefecture Matsumoto Mt. Norikura 36.12 N 137.59 E 2030 m 28 October 2009 Coll.: A. Lamb S. Shiyake Laricobius sp. Female Beaten from Tsuga diversifolia Havill sample 09-214.2 ( OMNH); 1, JAPAN Nagano Prefecture Ootaki Mt Ontake 35.87 N 137.51 E 2050 m 29 October 2009 Coll.: A. Lamb, S. Shiyake; Laricobius sp. Female Beaten from Tsuga diversifolia Havill sample 09-215.2 ( OMNH); 5, JAPAN Nagano Prefecture Ootaki Mt Ontake 35.86938 N 137.51064 E 2050 m 29 October 2009 A. Lamb S. Shiyake Beaten from Tsuga diversifolia Havill Sample # 09-215 (2, OMNH; 1, YPM; 1 BMNH; 1 NMNH); 1, JAPAN; Nagano Prefecture Shiga-kogen 17 October 2008 Coll. S. Shiyake A. Lamb Laricobius osakensis Beaten from Tsuga diversifolia male Havill Sample # 08- ( OMNH); 1, JAPAN Nagano Prefecture Matsumoto Mt. Norikura 15 October 2008 Coll.: S. Shiyake A. Lamb Beaten from Tsuga diversifolia female Havill sample # 08-291.2 ( OMNH); 1, JAPAN Nagano Prefecture Ootaki Mt Ontake 35.87 N 137.51 E 2050 m 29 October 2009 Coll. A. Lamb S. Shiyake Laricobius sp. Male Beaten from Tsuga ( OMNH).