Tetracnemoidea

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1 Body with yellow band medially (scutellum, mesopleura, ventrally)………………. sp. 1
1’ Body completely dark ………………………….……………………………………… 2

2(1) Scape completely light ………………………………………………………….. sp. 2
2’ Scape at least partially darkened ……………………………………………………… 3

3(2) Wings maculated centrally, scape yellow medially and dark laterally … sydneyensis
3’ Wings completely hyaline, scape light basally and dark apically………………..…… 4

4(3) Scape short, no longer than pedicel plus first 2 funicle segments ………………. sp. 3
4’ Scape as least as long as pedicel plus first 3 funicle segments ………………..……… 5

5(4) F1 shorter than F2 ……………………………………….……..………… peregrina
5’ F1 longer than F2 ………………………………………………………….. brevicornis

Sp. 1: Alameda, Marin, Stanislaus (RLZC), Santa Barbara (SBNH)
Sp. 2: San Diego (EMEC, UCR)
Sp. 3 Marin (RLZC)

Nearctic species and distribution
brevicornis (Girault, 1915): Introduced into USA (CA)
peregrina (Compere, 1939): Introduced into USA (CA)
sydneyensis (Timberlake, 1929): Introduced into USA (CA)
westwoodi (Cockerell, 1898): CAN (QC); USA (CO, ME)

Remarks
In a short series of T. sydneyensis from San Diego County (EMEC), the inner margins of the scape are red instead of white. In the USNM type collection are two cotypes of T. westwoodi – one is a male and the other has only part of the abdomen present – and in the main collection is a headless paratype. The intact specimens have completely dark bodies (unlike sp. 1) and dark forecoxa (unlike sp. 2 and sp. 3, which have light forecoxae).

References
Cockerell, T.D.A. 1898. Note on a chalcidid of the subfam. Encyrtinae, parasitic on Phenacoccus minimus. The Canadian Entomologist 30: 224.
Compere, H. 1939. Mealybugs and their natural enemies in South America. University of California Publications in Entomology 7: 57-73.
Girault, A.A. 1915. New genera of chalcidoid Hymenoptera. Journal of the New York Entomological Society 23: 165-173.
Timberlake, P.H. 1929. Three new species of the hymenopterous family Encyrtidae from New South Wales. University of California Publications in Entomology 5: 5-18.