Alysson cyanotaeniatus Zou and Chen, 2025

Alysson cyanotaeniatus Zou and Chen , sp. nov.

( Figure 1 View FIGURE 1 )

Type materials. Holotype, ♂, China: Guizhou Province, Fanjingshan Mountain, Jinding , 1993.VII.12, collected by Xuexin Chen. Paratype: 3♂, same data as holotype .

Diagnosis. This new species resembles A. caeruleus Wu and Zhou, 1987 in having the thorax and propodeum with a blue metallic luster, the free margin of the clypeus straight and the apical margin of the pygidial plate straight. It can be distinguished from the latter by the following characters: only pronotum and propodeum with blue metallic luster (thorax entirely with blue metallic luster in A. caeruleus ); in male, gastral tergum II with pair of round yellowish spots (no yellowish spot in A. caeruleus ); pronotal collar, scutum and scutellum with evidently larger punctures (with evidently smaller punctures in A. caeruleus ); propodeal enclosure as long as propodeal dorsum, with about 16 oblique longitudinal rugae (propodeal enclosure about as long as 5/6 of propodeal dorsum, with about six oblique longitudinal rugae in A. caeruleus ).

Description. Male: Body length 6.1–7.5 mm. Head and thorax black, with the following yellow parts: clypeus except median brown spot at base, base of mandible, labrum, maxillary palpus, labial palpus, subantennal sclerite, spots on lower frons laterally, long spot between antennal sockets, scape beneath, and terminal portion of pronotal lobe; flagellum yellowish brown beneath, dark brown dorsally. Legs pale brown to dark brown except fore coxa largely, fore trochanter, fore femur, fore tibia beneath, mid coxa largely, mid trochanter, hind coxa apically, and hind trochanter pale yellowish brown. Wings pale yellowish brown, forewing with pale brown band on portion of submarginal cell II. Gaster brown or dark brown, with pair of round yellow spots on tergum II anterolaterally, pygidial plate yellowish brown. Pronotum with inconspicuous and propodeum with well-defined blue metallic luster. Clypeus and lower frons with sparse, short white setae, upper frons and vertex with dense, short pale yellowish brown or yellowish brown setae; thorax (except propodeal enclosure glabrous) with sparse or dense, white to pale brown, short setae; gastral terga I and II with few pale yellowish or pale brown long setae, remaining terga with sparse or dense pale yellowish brown or pale brown long setae ( Fig. 1A View FIGURE 1 ).

Head. Vertex with dense, large punctures medially, with sparse, large punctures laterally. Upper frons with dense, large punctures, lower frons with sparse, median sized punctures; frons median furrow inconspicuous ( Fig. 1B View FIGURE 1 ). Clypeus length: width = 14: 42, with sparse, median sized punctures, slightly bulging anteromedially, free margin of clypeus straight ( Figs 1B, 1C View FIGURE 1 ). Mandible with one subapical inner tooth ( Fig. 1C View FIGURE 1 ). Flagellomere I: II = 9: 11, apical segment of flagellum depressed on inner side ( Fig. 1D View FIGURE 1 ). POL: OOL: OD = 10: 14: 6.

Mesosoma. Pronotal collar with dense, large punctures ( Fig. 1E View FIGURE 1 ). Mesoscutum with dense, large punctures, admedian and parapsidal lines evident ( Fig. 1E View FIGURE 1 ); scutellum with sparse, large punctures, median furrow shallow ( Fig. 1F View FIGURE 1 ); mesopleuron with sparse, large punctures, upper portion with broad, transverse furrow. Metanotum with sparse, large punctures; metapleuron with sparse, small punctures, upper area with several transverse rugae. Propodeum with triangular enclosure, pointed at end, as long as propodeum dorsally; enclosure with about 16 oblique longitudinal rugae and about 6 short transverse rugae posteriorly, propodeum outside of enclosure with about 15 oblique transverse rugae; posterior surface of propodeum with longitudinal median ridge and several short, oblique rugae ( Fig. 1F View FIGURE 1 ); lateral surface of propodeum with sparse, large punctures and several short, oblique rugae. First recurrent vein received by junction of submarginal cells I and II, second recurrent vein received by submarginal cell III ( Fig. 1G View FIGURE 1 ); hindwing vein M diverging at point of cu-a ( Fig. 1H View FIGURE 1 ).

Metasoma. Terga I and II polished, with few small punctures; terga III–VI with dense, small punctures ( Fig. 1I View FIGURE 1 ); pygidial plate with dense, large punctures, terminal edge straight ( Fig. 1J View FIGURE 1 ).

Female: unknown.

Distribution. China ( Guizhou Province).

Etymology. The new specific name, cyanotaeniatus , is derived from the cyan- (blue, Greek origin) and - taeniatus (banded, Greek origin), referring to the fact that only pronotum and propodeum have the blue metallic luster, which is one of the important identifying characters of this species.