Cryptocephalus ( Cryptocephalus ) tsutsumiuchii, Shigetoh, 2025

Cryptocephalus ( Cryptocephalus) tsutsumiuchii sp. nov.

[Japanese name: Nise-kiboshi-tsutsu-hamushi]

(Figures 1, 3A, D)

Materials examined. Holotype. ♂, “ 宮¼県$諸県郡 [Miyazaki-ken, Higashimorokata-gun] / 綾町綾Njnj [Aya-chô, Ayaminamigawa] / 12.VIII.2023 / AEÉḆĽ Ḧ集 [ Yuji Tsutsumiuchi leg.] (typed on white card) // [ HOLOTYPE] Cryptocephalus ( Cryptocephalus) tsutsumiuchii / Shigetoh, 2025 (typed on red card)” ( SEHU) . Paratypes. Japan. Kyushu: [ Miyazaki Pref.] 2 ♀, Aya-chô, Ayaminamikawa (same as the holotype) , 21. VIII .2023 , Y. Tsutsumiuchi leg. ( YTPC); 5 ♂, 6 ♀, ditto, 12. VIII .2023 , Y. Tsutsumiuchi leg. ( YTPC & HIPC); 1 ♂, 4 ♀, ditto, 20. VIII .2023 , Y. Tsutsumiuchi leg. ( HIPC); 2 ♂, 1 ♀, ditto, 21. VIII .2023 , Y. Tsutsumiuchi leg. ( YTPC); 1 ♀, ditto, 2. IX .2023 , Y. Tsutsumiuchi leg. ( YTPC); 1 ♀, Aya-chô, Minamimata , 29. IX.2023, T. Saeki leg. ( HIPC); 1 ♀, Kunitomi-chô, Fukadoshi , 2. IX .2023 , Y. Tsutsumiuchi leg. ( YTPC); 3 ♂, 1 ♀, ditto, 27. VI.2025, Y. Tsutsumiuchi & H. Shigetoh leg. ( YTPC & HIPC).

Diagnosis. This new species is very similar in general appearance to Cryptocephalus ( C.) perelegans ( Figure 2A, B View FIGURE 2 ), C. ( C.) loochooensis Chûjô, 1935, and C. ( C.) ohnoi Kimoto, 1983 but it is clearly separated from these sibling species by the combination of the following characters: scutellum heart-shaped; elytron with five yellowish spots; elytral striae VI to IX complete; pygidium without ridge at middle; median lobe of aedeagus parallel-sided to basal 3/5, semicircular apex in dorsal view, upper side becomes membranous after half which expand dorsally and cover the orifice; uniformly convergent to acute apex in lateral view.

Description. Male. Body cylindrical, upper side shiny, 3.05–3.30 mm in length. Coloration.Antennal segments black or brown except for segments I to III yellowish brown; head, legs, pygidium, and ventral surface yellowish brown; pronotum black with yellowish brown spots at base, along the basal margin and along the anterior margin yellowish brown; scutellum black; elytron black, each with five yellowish brown spots: 1) basi-scutellar spot elongate, reaching along elytral suture from base to basal 5/7, 2) interio-humeral spot slender, shorter or same length to the length of basi-scutellar one, 3) median spot elongate, spread from elytral suture to stria IV, 4) latero-median spot large, spread from stria VI to lateral side of elytron, and 5) apical spot, round, largest of all elytral spots, reaching from basal 2/7 to elytral apex.

Head. Vertex wrinkled with longitudinal sulcus at middle, irregularly and sparsely punctate bearing with silver setae; the width between the central part of eyes 3.1 times as wide as the ones of the upper part; eye reniform, oblong, reaching from vertex to the side of clypeus; frons uneven, irregularly punctate bearing with silver setae, interspace of punctures with minute punctures; clypeus trapezoid, irregularly and weakly punctate, bearing short silver setae; labrum transverse, parallel-sided, anterior margin sinuate, surface smooth.

Antennae filiform, reaching to humeri; segment I robust, 2.3 times as long as wide, widest at middle; segment II shortest, barrel-shaped, 1.3 times as long as wide; segment III to V slender, about 4.0 to 5.0 times as long as wide, weakly widened apically, widest near apex; segment VI to X about 3.0 times as long as wide, widest before apex, segment XI widened apically, widest at basal 3/5, then suddenly becoming narrowed, gradually convergent to apex.

Pronotum moderately convex, transverse, minutely and irregularly punctate, 1.6 times as wide as long, widest at base; anterior margin strongly rounded; lateral margins curved, widened to base; posterior margin sinuated, sharply and posteriorly protrude at middle.

FIGURE 1. Cryptocephalus ( C.) tsutsumiuchii sp. nov. —A, B, C, G, H, I. male; D, E, F, J. female.—A, D. dorsal habitus; B, E. lateral habitus; C, F. ventral habitus; G. pygidium; H. aedeagus (dorsal view); I. ditto (lateral view); J. spermathca. Scale var = 0.5 mm (H, I), 0.1 mm (J).

Scutellum heart-shaped, 1.3 times as long as wide, widest near base, convergent to apex, surface smooth; lateral margins moderately and weakly curved.

Elytra 1.2 times as long as wide, widest behind base, moderately punctate in regular striae, striae IV and V, VIII and IX connected near elytral apex, respectively, striae VI and VII connected at basal 3/4, the interspaces of striae smooth, wider than punctual diameter, lateral margins weakly narrowed from base to basal 5/6, then strongly convergent apically.

Pygidium with broadly rounded apex, flat, irregularly punctate, covered with short setae.

Ventral surfaces of body with dense punctures and short silver pubescence. Prosternum weakly depressed, lateral sides of posterior margin protruding backward. Abdomen clothed with short pubescens, irregularly and weakly punctate; apex of last ventrite without foveae.

Median lobe of aedeagus elongate, in dorsal view parallel-sided to basal 3/5, then roundly convergent to semicircular apex, upper side becomes membranous after the basal half, expanding dorsally and covering the orifice, notched medially; in lateral view weakly bent ventrally near base, weakly swollen in half, uniformly convergent to acute apex; ventral margin straight; length of median lobe as same as basal hood. Tegmen Y-shaped, uniformly curved.

Female. Body larger than male, 3.89–4.10 mm in length. Coloration. Upper side of pronotum and elytra paler than in male; margins of elytral spots unclear, basi-scutellar, median, and apical spots weakly connected each other; antennae shorter than male ones; pronotum 1.8 times as wide as long; elytra parallel-sided to basal 1/3, then convergent to apex; apex of last ventrite with foveae; Spermatheca hook-shaped with acute apex.

Food plant. Taxillus yadoriki ( Loranthaceae ).

Distribution. Japan (Kyushu).

Remarks. This new species was collected from T. yadoriki , which parasitized on woody plants growing in sunny locations ( Figure 3C, F View FIGURE 3 ). The adult feed on the leaves scraping the edges ( Figures 3A, D View FIGURE 3 ). The eggs are covered with fecal as same as the other species of Cryptocephalinae . This species does not feed the leaves of Castanopsis sp. , which was parasitized by T. yadoriki .

Etymology. The scientific name of C. ( C.) tsutsumiuchii sp. nov. is dedicated to Mr. Yuji Tsutsumiuchi, a Japanese coleopterist, who discovered this new species.