Odontopsen shii, Ma, Li and Chen

Ma, Li, Li, Qiang & Chen, Xue-Xin, 2010, A rare genus Odontopsen Tsuneki in China (Hymenoptera: Apoidea: Crabronidae), with description of a new species, Zootaxa 2359, pp. 58-60 : 58-59

Odontopsen shii, Ma, Li and Chen , sp. nov.

( Figs. 1–7 )

Female. Body length 8.7 mm. Black; flagellomeres IV–XI yellowish ventrally. Setae on labrum yellowish, dense and long; on mandible yellowish, sparse and short; on lower frons silvery, dense and short; on vertex brown, sparse and long, on mesopleuron and propodeum slightly yellowish, dense and long.

Clypeus broad and polish, gradually impressed toward its middle, which is much lower than the laterals; free margin of clypeus with two broad, round prominences medially; each prominence with oval tubercle near apex, tubercle shiny and markedly elevated ( Fig. 1 ). Mandible inconspicuously bidentate apically ( Fig. 1 ). Interantennal tubercle small, round, conspicuous ( Fig. 1 ). Upper frons with dense minute punctures that are 1× diameter apart. Frontal carina incomplete. Vertex smooth, posterior area deeply emarginated ( Fig. 2 ), with dense and very slender transverse striations. Inner orbits in frontal view markedly divergent below ( Fig. 1 ). Head in profile with occipital carina produced into conspicuous dentate process, outer margin of process with sparse, sturdy and longitudinal rugae ( Figs. 3, 4 ). HW: HLD: HLF = 104: 37: 55; TW: EW: EL = 33: 19: 47; POD: OOD: OCD: DEL: DEU = 11: 19: 21: 75: 61; AOD: WAS: IAD = 19: 7: 16. Relative length of flagellomeres I–IV: 20, 14, 13, 12. Length of flagellomere I: width at apex = 20: 4 ( Fig. 5 ).

Pronotum with several short transverse rugae, and apicolateral process ( Fig. 6 ). Scutum with sparse, minute punctures that are 1–4× diameters apart. Scutellum and metanotum smooth, shiny, and nearly impunctate. Mesopleuron shiny, smooth and impunctate, with very slender, sparse, short oblique transverse striations posteriorly; hypoepimeral area with very slender, dense longitudinal rugae. Propodeal enclosure with shallow depression, and slender, longitudinal rugae; propodeal pad broad, polished; posterior surface of propodeum with very slender, dense, regular, longitudinal rugae. Outer surface of hind tibia with row of yellowish sturdy spines. First recurrent vein of forewing ending in second submarginal cell; second recurrent vein ending in second submarginal cell or interstitial between second and third submarginal cell.

Gastral segments polished. Petiole slender, long, smooth, shiny; dorsal surface with a very broad longitudinal carina medially and ventral surface without keel. PL: PW: LTI: WTI: HFL: HTL = 50: 9: 42: 36: 58: 67. Pygidial area broadly triangular, with dense, coarse punctures and with setae ( Fig. 7 ).

Male: Unknown.

Specimen examined. Holotype: female, China: Tibet, Nyingchi Prefecture, Lulang, 29°30ʹN 94°18ʹE, 19.ix.2007, coll. Fu-ming Shi, deposited in the Insect Collections of Yunnan Agricultural University, Kunming, Yunnan Province, China (YAUK).

Distribution. China (Tibet).

Etymology. The species is named in honour of Prof. Fu-ming Shi, the collector of the holotype specimen.

Note. This new species shares with the type species of Odontopsen with the following distinguishing characters: Frontal carina incomplete below; occipital carina reaching hypostomal carina far from mid-ventral line of head, lower part of carina produced obviously in male but developed into large process in female; pronotum with several oblique lateral carinules but without complete ridge like carina; omaulus curving toward prothorax, without acetabular carina; scrobal sulcus distinct but not deeply impressed, hypoepimeral area weakly reticulate but not markedly bulging; forewing recurrent veins ending at submarginal cells I and II or both at II; hindwing medial vein diverging before cu-a; propodeum largely smooth, only some areas striate; petiole dorsally with median longitudinal carina; female pygidial plate subtriangular.

This new species can be distinguished from the type species, O. hanedai ( Tsuneki, 1964) , by the characters given in the key below.

Figures

FIGURES 1 – 7. Odontopsen shii, Ma, Li and Chen, sp. nov., female. (1) Frontal view of head; (2) dorsal view of head; (3) lateral view of head; (4) ventral view of occipital process; (5) lateral view of antennal flagellomere; (6) dorsal view of pronotum; (7) dorsal view of pygidial plate. Scale bars: Figs. 1 – 5: 1 mm; Fig. 6: 1.48 mm; Fig. 7: 1.89 mm.