Dasyproctus longi Pham, 2022

Pham, Phong Huy, 2022, Taxonomic studies on Dasyproctus Lepeletier & Brullé (Hymenoptera: Crabronidae) from North Vietnam with description of two new species, Zootaxa 5188 (1), pp. 43-54 : 47-49

4. Dasyproctus longi Pham , sp. nov.

( Figs 25–30 )

Material examined. Holotype, ♀, pinned (deposited in IEBR), VIETNAM: Ha Noi, Hoa Lac, Thach That , 5– 15.vi.2002, Malaise trap set up in a tea garden, Coll. Khuat Dang Long [ IEBR].

Diagnosis. The new species is similar to D. buddha (Cameron) in having, clypeus slightly beveled, free margin slightly indented medially, lateral area with an angular tooth on each side, longitudinal carina distinct, reaching free margin; mandible yellow basally, reddish to black apically; scapal basin densely rugose, with thick, adpressed silvery setae; IOC conspicuous; frons with narrow, shallow furrow above IOC; anterior carina of pronotal collar laterally bending towards insertion of fore coxa; pronotum with anterior surface smooth, striate laterally, pronotal collar yellow, distinctly notched medially; mesopleuron with sparse, fine, small punctures; metanotum striate; metapleuron obliquely ridged; propodeum with coarse, oblique rugae dorsally, posteriorly, and laterally; mesosoma with white setae, sparse on scutum and denser on propodeum; scutellum yellow antero-laterally; axilla yellow; tegula testaceous; dorsal surface of all tibiae yellow; metasoma with yellow maculae on T3 and T4. It clearly differs from D. buddha by the following characters: scape with black spot dorsally (in D. buddha , scape without black spot dorsally), vertex with moderately dense punctures (in D. buddha , vertex with sparse, fine, small punctures); OOD 1.2 × POD (in D. buddha, OOD equal to POD); fore tarsomere 1 with three short spines medially (in D. buddha , fore tarsomere 1 with two short spines medially); metasoma and legs reddish brown with yellow markings (in D. buddha , metasoma and legs black with yellow markings), T1 conspicuously extended apically, apical width 3.2 × its basal width dorsally (in D. buddha , T1 moderately extended apically, apical width about 2.2 × its basal width dorsally); T2 with maculae, those on T2 extended, equal to those on T3 and T4 (in D. buddha , T2 immaculate or bimaculate, in the latter case maculae on T2 smaller than those on T3).

Description. Female, holotype ( Figs 25‒30 ): Body length 10.2 mm, forewing length 6.8 mm.

Colour: Body black with following parts variously coloured: scape yellow with black spot dorsally; mandible yellow basally, reddish to black apically; pedicel reddish brown; flagellum brownish black; pronotal collar and pronotal lobe yellow; spot on mesopleuron yellow; scutellum yellow antero-laterally; axilla yellow; tegula testaceous; legs reddish-brown; large band on ventral surface of fore and mid femora, dorsal surface of fore and mid tibiae, all basitarsi yellow; medial band of hind tibia yellow dorsally; metasoma reddish brown; maculae on T2‒T5 yellow.

Head ( Figs 25 & 26 ): In frontal view rectangular, 1.4 × as long as wide, as seen from above transverse; mandible tridentate apically, with middle tooth longest; clypeus with dense silvery setae, slightly beveled, free margin slightly indented medially, lateral area with an angular tooth on each side, longitudinal carina distinct, reaching free margin; antennal sockets contiguous with one another and with inner eye margin; scape with two longitudinal, parallel carinae ventrally; flagellum with short, dense, adpressed setae, flagellomere I longer than following ones, relative lengths of scape: pedicel: flagellomere I = 28:3:6; scapal basin densely rugose, with thick, adpressed silvery setae; IOC conspicuous; frons densely punctate, with narrow, shallow furrow above IOC; OOD 1.2 × POD; vertex moderately densely punctate, with well imprinted supra orbital fovea; frons and vertex covered with sparse brownish setae; gena with several small pits separated over matt interspaces, and moderately dense silvery setae.

Mesosoma ( Figs 28 & 29 ): Anterior carina of pronotal collar laterally bending towards insertion of fore coxa, medially parallel to anterior margin of scutum, pronotum with anterior surface smooth, conspicuously striate laterally, pronotal collar distinctly notched medially; scutum with moderately dense, small punctures, and short, longitudinal rugae posteriorly; scutellum with short, oblique rugae laterally, and sparse, small punctures; mesopleuron with sparse, fine, small punctures; metanotum with longitudinal striae mixed with small punctures; metapleuron obliquely ridged; propodeum with coarse, oblique rugae dorsally, posteriorly, and laterally, median furrow deep; dorsal surface of fore tarsomere 1 with three short spines medially. Mesosoma with white setae, sparse on scutum and denser on propodeum.

Metasoma ( Figs 27, 30 ): Sub-sessile; gastral segment 1 stout, 1.9 × as long as high laterally, length of gastral segment 1 equal to that of hind femur, and about ½ × that of following three gastral segments combined, T1 conspicuously extended apically, apical width 3.2 × its basal width dorsally, basal area smooth, with two carinae; T2 with deep, smooth, shiny transverse furrow at anterior margin; T1‒T5 with sparse, fine, small punctures; T2‒T5 with maculae, those on T2 extended, equal to those on T3 and T4; pygidial plate with coarse, dense punctures, conspicuously narrowed and gutter-like apically. Metasoma with whitish brown setae.

Male. Unknown.

Etymology. The species is named after Sir Khuat Dang Long, who collected the holotype.

Distribution. Vietnam: Ha Noi.

Remarks. For females, in the key to Asian and Oceanic Dasyproctus ( Leclercq 2015) , this new species runs to No. 10 and it can be inserted as follows:

11. Anterior carina of pronotal collar straight, nearly parallel to anterior margin of scutum............................. 12

- Anterior carina of pronotal collar conspicuously oblique laterally, not parallel to anterior margin of scutum............ 14

12. Vertex with moderately dense punctures; fore tarsomere 1 with three short spines medially; metasoma and legs reddish brown; T1 conspicuously extended apically, apical width 3.2 × its basal width dorsally; T2 with extended maculae, equal to those on T3 and T4.............................................................................. D. longi sp. nov.

- Vertex with sparse, fine, small punctures; fore tarsomere 1 with two short spines medially; metasoma and legs black; T1 moderately extended apically, apical width about 2.2 × its basal width dorsally; T2 immaculate or bimaculate, in the latter case maculae on T2 smaller than those on T3 ( D. buddha (Cameron) and D. buddha (Cameron) var.)..................... 13

13. = 11 in the key to Asian and Oceanic Dasyproctus ( Leclercq 2015) .

14. = 12 in the key to Asian and Oceanic Dasyproctus ( Leclercq 2015) .

Figures

FIGURES 25–30. Dasyproctus longi Pham sp. nov. Holotype ♀. 25. Head, frontal view; 26. Head, dorsal view; 27. Metasoma, dorsal view; 28. Mesosoma, lateral view; 29. Mesosoma, dorsal view; 30. Habitus, lateral view.