Laricobius osakensis Montgomery and Shiyake, 2011

Leschen, Richard A. B., 2011, World review of Laricobius (Coleoptera: Derodontidae), Zootaxa 2908, pp. 1-44 : 23-24

16. Laricobius osakensis Montgomery and Shiyake, 2011 , in Montgomery et al. 2011

(figs 16, 43, 51)

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 incurvate; elytral punctures not confluent. Epipleura at base dark. Ventrites dark. Tibiae and femora dark. Aedeagus with median carina on phallobase; medium lobe subacute; apices of parameres without an internal ridge.

Description. Length 2.18–2.82 mm (x = 2.50, n = 15). Body bicolored with head, prothorax, scutellum, elytra along sides to level of abdominal ventrite 3 (usually covering striae 7–10) and suture along scutellary striole, epipleuron, venter, and usually the femora brown to black; elytra dark to light tan; antenna tan with AI dark tan and club usually darker than funicle but lighter than A1, palpi, and tarsi tan, femora and tibiae dark tan or brown. Head without ocelli; u-shaped furrow present, but very weak or absent; interocular distance about 4x the width of the eye; macropunctures rounded and distinct to indistinct and shallowly impressed; micropunctures coarse; setae erect, moderately elongate with an average length as long as 2/3 the width of the eye. Antenna with length of A3 about equal to A4, ratios 2.0:1.7:1.4:1.5:1.5:1.1:1.2:1.0:1.4:1.5:2.1; 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 0.77 x as long as wide (pronotal length/ greatest pronotal width = 0.68–0.87, x = 0.77); depth = 0.25–0.38 mm (x = 0.32); 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 distinct, rounded, and without a short tooth; foveae visible dorsally; macropunctures on disc distinct, usually weakly-impressed and well-separated; micropunctures coarse; setae erect, moderately long and 2/ 3 to full width of eye. Elytra about 3.24 x as long as wide (elytral length/greatest elytral width = 2.81–3.53, x = 3.24) and 3.20 x as long as pronotum (elytral length/pronotal length = 2.81–3.61, x = 3.20); surface weakly incurvate at basal third; macropunctures not coalescing to form grooves, separated by 1/2 puncture diameter; micropunctures sparse; microsculpture visible in some specimens (but usually absent); setae suberect to subdecumbent, short and on average about 1/3 to 2/3 length of the eye. Aedeagus with phallobase transverse (wider than long), just over 2/3 the length of the median lobe, median carina present; median lobe projecting slightly beyond apices of parameres, relatively broad with its greatest width larger than the width of the parameres, apex subacute, median carina or groove absent, ostium subapical; parameres narrow, slender and acute, very short setae present on apices and not along inner margin, internal subapical ridge absent. Spiculum gastrale apically narrow.

Comments. Laricobius osakensis lacks ocelli and can be distinguished from other species with this character by the absence of a well-developed posterior tooth on the pronotal margin. The dark tibiae and red-brown rather than vivid orangish elytral coloration distinguish it from L. naganoensis : but to confirm the species collected in higher altitudes of Nagano Japan, dissection of males is recommended.

Hosts. Plants: Tsuga diversifolia , Tsuga sieboldii Carr. Adelgids : Adelges tsugae .

Biology. Natural history notes ( Montgomery et al. 2011).

Distribution. Japan: Honshū, Shikoku.

Type material examined. PARATYPES. 14, JAPAN, Gunma Prefecture, Katashina, Mt. Nikko-Shirane, 36.81287 N, 139.34099 E, 1550 m, 31 October 2009, Coll.: A. Lamb & S. Shiyake, Havill Sample #09-219 (2, NZAC; 2, OMNH; 10, YPM); 1 JAPAN, Nagano Prefecture, Shiga-kogen, 17 October 2008, Coll.: S. Shiyake & A. Lamb, Havill Sample #08-289.2 ( YPM); 1, JAPAN, Nagano Prefecture, Matsumoto, Mt. Norikura, 36.11419 N, 137.61401 E, 1590 m, 28 October 2009, Coll.: A. Lamb & S. Shiyake, Havill Sample #09-213 ( YPM); 3, JAPAN, Nagano Prefecture, Matsumoto, Mt. Norikura, 36.12203 N, 137.58749 E, 2030 m, 28 October 2009, Coll.: A. Lamb & S. Shiyake, Havill Sample #09-214 ( YPM); 3, JAPAN, Nagano Prefecture, Ootaki, Mt. Ontake, 35.86938 N, 137.51064 E, 2050 m, 29 October 2009, Coll.: A. Lamb, & S. Shiyake, Havill Sample #09-215 ( YPM); 4, JAPAN, Nagano Prefecture, Yamanouchi, Shiga-kogan, 36.68213 N, 138.50032 E, 1720 m, 30 October 2009, Coll.: A. Lamb & S. Shiyake, Havill Sample #09-218 ( YPM); 4, JAPAN, Osaka Prefecture, Kawachi Nagano, Site # 1 Kita-san, 34º 24.150'N, 135º 33.761'E, 231 m, 27 Feb 2006, Coll.: T. McAvoy & A. Lamb, Virginia Tech nos. 147–150 ( YPM); 3, JAPAN, Tochigi Prefecture, Nikko, Konsei Pass, 36.81883 N, 139.39461 E, 2020 m, 1 November 2009, Coll.: A. Lamb & S. Shiyake, Havill Sample #09-216 ( YPM); 4, JAPAN, Tochigi Prefecture, Nikko, Nikko-Yumoto Spa, 36.80325 N, 139.4203 E, 1485 m, 31 October 2009, Coll.: A. Lamb & S. Shiyake, Havill Sample #09-22 ( YPM).

Additional material examined. JAPAN. 2, various localities in Osaka Prefecture and Shikoku (Kansai area?), January 2008, A. Lamb, Havill Sample #08-263.1 ( PNHM); 2, JAPAN, Osaka Prefecture, Kobe Municipal Arboretum, 34° 44.445' N, 135° 10.566' E, 2- III-2006–7 -III-2006, Coll.: T. McAvoy, A. Lamb & S. Shigehiko, Virginia Tech nos. 177–178 ( YPM). UNITED STATES. Virginia (lab reared): 6, Nov. 2007, M. Beck, F2 originally from Osaka Pre., Virginia Tech nos. 171–176; 1, Virginia Tech rearing facility, 2007–2008, A. Lamb, Havill Sample #08-264 ( YPM); 2, same but October to November 2006, A. Lamb, F1 generation; emerged as adults in Oct. to Nov. 2006, parents from various sites in Japan; Honshu, Havill Sample #06-117 ( YPM).