Analysson vietnamensis Pham sp. nov. (Figs 3–14) Material examined. Holotype, ♀, pinned (deposited in IEBR), VIETNAM: Ha Noi, Bac Tu Liem, Co Nhue 2, Dong 1, 21°03′23.6″N, 105°46′29.9″E, 25.ix.2022, sweep net, in a vegetable field, Phong Huy Pham collector [IEBR]. Paratype (IEBR): VIETNAM: Ha Noi: 1 ♀, Bac Tu Liem, Co Nhue 2, Dong 1, 21°03′23.8″N, 105°46′30.6″E, 19.viii.2019, sweep net, Phong Huy Pham collector [IEBR]. Diagnosis. The new species clearly differs from A. rufescens by the characters mentioned in the key. Description.The new species is similar to A.rufescens Krombein in having mandible with small tooth subapically (Fig. 3); frons, vertex, pronotum, and scutum densely punctate, with dense silvery setae (Figs 3–5); distance between eyes on vertex about 1.2 × that between eyes at base of clypeus (Fig. 3); slightly oblique rugulae on lateral surface of pronotum and mesopleuron (Figs 6 & 14); propodeum with enclosure dorsally, carinae dorsolaterally (Fig. 5), slightly oblique carinae laterally (Figs 6 & 9), middle carina and transverse rugulae posteriorly; metasomal terga I and II polished, very sparse, small punctate, with scattered, long white setae (Figs 12 & 14); metasomal terga III–V small punctate, with moderately dense, long, suberect cinereous setae (Figs 12–14); pygidial plate round apically, with dense punctures (Fig. 13); body black (Fig. 14); scutellum, metanotum, narrow posterior band on mesopleuron, metapleuron, propodeum (Figs 5, 6, 9, 14), hind coxa and trochanter (Figs 6, 7, 9, 11, 14), and about basal two thirds of first metasomal tergum red (Figs 9, 12, 14); basal half of mandible, labrum, apical two thirds of clypeus, elongate triangular mark along inner eye margin from clypeus halfway to anterior ocellus (Fig. 3), scape except black band laterally, pedicel and basal three fourths of flagellomere I dorsally (Figs 3 & 4), anterior surface of fore coxa, ventral surface of fore trochanter and femur basally (Fig. 10), band on dorsal surface of all tibiae (Fig. 14), and lateral oval spot near base of metasomal tergum II yellowish white (Figs 12 & 14); wings hyaline, forewing with large infuscate band from marginal cell across second and third submarginal cells to posterior margin (Figs 8 & 14). Female, holotype (Figs 3–14): Body length 5.6–5.8 mm, forewing 4.4–4.6 mm. Colour. Body black with following parts red: most of mid coxa and trochanter, extreme base of hind femur, and first metasomal sternum (Fig. 11). Following parts yellowish white: band along anterior surface of fore and mid tibiae, basal third of hind tibia, and fore tarsi except basal tarsomere (Fig. 14). Forewing with stigma black and veins blackish to yellowish; hindwing anteriorly with small infuscate spot subapically (Figs 8 & 14). Vestiture. Head with moderately dense, short, subappressed, silvery setae on side of clypeus, outer surface near base of mandible (Figs 3 & 4), and gena (Fig. 14); basal half of mandible, middle area of clypeus, vertex with some long, suberect silvery setae (Figs 3 & 4). Mesosoma with moderately dense, short, subappressed silvery setae on mesopleuron anteriorly (Figs 5 & 6), and legs (Fig. 7); red areas with moderately dense, short, cinereous setae (Figs 5 & 6). pygidial plate with dense, erect cinereous setae (Figs 12–14). Head (Figs 3 & 4). Median lobe of labrum conspicuously trilobate; clypeus broad, thin apically, with anterior margin nearly straight, median lobe truncate; obtuse angle on inner edge near middle area; eyes moderately converging below; distance between inner margins of hind ocelli 0.58 × that between outer margin of hind ocellus and nearest inner orbit, 1.86 × that between inner margin of anterior ocellus and inner margin of hind ocellus, and 0.81 × that between hind ocellus and occipital margin; frons and vertex with close punctures, distance among punctures equivalent to puncture diameter. Mesosoma (Figs 5–10, 14). Pronotum and scutum densely punctate, punctures less than one diameter apart; mesopleuron with omaulus conspicuously presented, and short, longitudinal carinae behind it; upper mesopleuron with small punctures; scutellum with sparse, small punctures; metanotum with inconspicuous longitudinal striae mixed with small punctures; metapleuron impunctate except upper area with scattered, small punctures; propodeum with conspicuous enclosure dorsally, its length about ⅟₂ × that of dorsal surface of propodeum, dorsal surface with slightly divergent, short carinae around enclosure, lateral carinae with very small teeth posteriorly, posterior surface with horizontal carinae beside longitudinal middle carina; tarsi with hard, long spines laterally; tarsal claw simply. Forewing with three submarginal cells, second submarginal cell with conspicuous petioles; stigma about as long as 3.0 × prestigma. Metasoma (Figs 11–14). Tergum I with small tooth basolaterally; sternum I with several longitudinal carinae; tergum II polished, about apical half impunctate, basal half very sparsely punctate; terga III–V with very small punctures, these punctures very sparse medially and moderately dense laterally; pygidial plate round apically, with dense punctures, distance among punctures equivalent to puncture diameter. Male. Unknown. Etymology. The specific name of this new species refers to its country of origin, Vietnam. Distribution. Vietnam: Ha Noi (Fig. 1).

Published as part of Pham, Phong Huy, 2023, New record of the rare genus Analysson Krombein, 1985 (Hymenoptera: Crabronidae) from Vietnam, with description of a new species, pp. 180-184 in Zootaxa 5271 (1) on pages 181-184, DOI: 10.11646/zootaxa.5271.1.10, http://zenodo.org/record/7859868