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Somatochlora whitehousei (Whitehouse's Emerald)

BC conservation rank: S4. Yellow List.
Description: Similar to S. septentrionalis, but much more common. Both have a dark spot at the base of each hindwing (see fig. 15). Both have brassy green thorax sides with a short, indistinct yellow-brown stripe below the base of the forewing (sometimes an indistinct yellowish patch below the base of the hindwing). The main difference is in the shapes of the male appendages (fig. 13g) and vulvar lamina (fig. 14g). Length: male female 47 mm.
Global Range: Yukon and British Columbia east to Labrador and Newfoundland (Needham et al. 2000). Faunal element: Widespread Boreal (see Appendix 2).
BC Distribution: Widespread east of the Coast Mountains from the southern plateaus and Rocky Mountains to the Yukon border. Very rare south of 51ºN. Not yet known from the Northeast.
Biology: Uncommon overall, but often abundant in suitable habitats. Prefers level, shallow, mossy fens and bogs dominated by short sedges and buckbean (Wf07-08). Males patrol across and around pools or small shallow puddles. Named for Francis Whitehouse, a BC banker and student of dragonflies.
BC flight period: early June to early September; recorded from early July to early August.


Somatochlora whitehousei male. Photograph: Robert A. Cannings, RBCM

Somatochlora whitehousei Map 1. Geographical distribution and seasonal abundance of records in British Columbia.

Somatochlora whitehousei Map 2. Geographical distribution of records in British Columbia before and after organized surveys began in 1996.

Somatochlora whitehousei Map 3. Frequency of records in British Columbia by NTS 1/50,000 mapsheet.

Somatochlora whitehousei Map 4. Frequency of collection localities in British Columbia by NTS 1/50,000 mapsheet.

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