Pristiphora frigida (Boheman, 1865)

Prous, Marko, Kramp, Katja & Liston 1, Veli VikbergAndrew, 2017, North-Western Palaearctic species of Pristiphora (Hymenoptera, Tenthredinidae), Journal of Hymenoptera Research 59, pp. 1-190 : 68-69

Pristiphora frigida (Boheman, 1865) Figs 17, 200, 274

Nematus frigidus Boheman, 1865: 568-569. Lectotype ♂ (NHRS-HEVA000005005; designated by Prous et al. 2016) in NHRS, examined. Type locality: "Middel Hook in Belsund" (Spitsbergen Island), Svalbard, Norway.

Pristiphora Adelungi [sic!] Konow, 1902: 162, 167-168. Lectotype ♀ (DEI-GISHym30151; designated by Prous et al. 2016) in ZIN, examined. Type locality: Hornsund (Spitsbergen Island), Svalbard, Norway.

Pristiphora gelida Wong, 1968: 185, syn. n. Holotype ♂ (USNMENT00778416) in USNM, not examined. Type locality: Point Barrow, Alaska, USA.

Similar species.

Externally, perhaps the most similar species is P. bifida , from which it can be distinguished by having black or brown hind trochanters and trochantelli, and usually black tibiae (pale in P. bifida ). In addition, antennae of males have only some barely visible stout black setae among finer paler ones (Fig. 17), while these are numerous and clearly visible in P. bifida (Fig. 18). On the other hand, the penis valve (Fig. 274) might indicate a closer relationship to P. melanocarpa and P. ruficornis (Figs 264, 266), because of a membranous fold near the tip of the valvispina that is missing in other species of the ruficornis group. The tangium of the lancet (Fig. 200) also resembles more closely the Betula feeding P. melanocarpa and P. ruficornis (Fig. 191) rather than P. bifida (Fig. 199): the dark sclerotized area is rather broader than long instead of longer than broad. Although we did not study the holotype of gelida Wong, six specimens from Canada identified by Wong as P. gelida could not be distinguished from P. frigida . The minute differences figured by Wong (1968: 186) between gelida and frigida penis valves and lancets are not reliable. Penis valves of one of the specimens that we studied from Canada are more similar to the figure given by Wong (1968) for frigida .

Genetic data.

No data.

Host plants.

Unknown.

Distribution and material examined.

West Palaearctic, Nearctic. Specimens studied are from Canada and Norway (Svalbard).