Last updated February 2019
1 Forewing suffused with maculation, especially darkened at venation ………….…. sp. 1
1’ Forewing hyaline, may be some darkening at venation ……….……………………….. 2
2(1) F6 quadrate .………..…………….………………………………………………… 3
2’ F6 distinctly longer than broad …….……………………………………………….…. 8
3(1) MV appearing cuneiform, length from hyaline break to beginning of SV not longer than broad .……………………………..……………… 4
3’ MV, from hyaline break to beginning of SV distinctly longer than broad …………… 7
4(3) Mouth about 0.5x head width …………………………………………………… sp. 9
4’ Mouth distinctly less than 0.5x head width ………………………..………………….. 5
5(4) Scutellum longitudinally reticulate; tibiae all yellow except for basal dark band ……………….. sp. 10
5’ Scutellum not longitudinally reticulate; tibiae more extensively darkened ………..… 6
6(5) Scutellum finely punctate ………………………………………………………. sp. 2
6’ Scutellum sculpturing imbricate …………………………………………………… sp. 4
7(3) FV with row of dimples next to each eye, and additional ones mesally; club obliquely truncate ………………………..…….. sp. 6
7’ FV without such sculpture; club vertically truncate ……………………………… sp. 5
8(2) F6 lighter than other funicle segments …………….…………………………… sp. 8
8’ F6 concolorous with other funicle segments …………..……….…………………….. 9
9(8) Scutellum longitudinally reticulate; tibiae all yellow except hind tibia with basal dark band …………………..………..………………………….……………… sp. 11
9’ Scutellum not longitudinally reticulate; tibiae more extensively darkened ………… 10
10(9) F1-F4 no more than 2x width; scutellum lightly imbricate …………..…..…….. sp. 3
10’ F1-F4 each almost 3x width; scutellum deeply reticulate ………..………………. sp. 7
Sp. 1 Contra Costa, Kern, Riverside, San Bernardino, San Diego, Solano, Stanislaus, Tulare, Yolo (CAS, RLZC, UCRC)
Sp. 2 Alameda, Contra Costa, Humboldt, Marin, Modoc, Nevada, San Luis Obispo, San Mateo, Sonoma, Yuba (CSCA, EMEC, RLZC)
Sp. 3 Alameda, Fresno, Mono, Placer, San Joaquin, Solano, Stanislaus, Yolo, Yuba (CAS, EMEC, RLZC, UCDC)
Sp. 4 Alameda, Contra Costa,Marin, Nevada, Riverside, Sacramento,San Joaquin, Stanislaus, Sutter, Tuolumne (EMEC, LACM, RLZC, UCDC, UCFC)
Sp. 5 Marin (RLZC)
Sp. 6 Alameda, Los Angeles, Marin, Orange (CAS, CSCA, EMEC, RLZC, UCRC)
Sp. 7 Kern (RLZC)
Sp. 8 Stanislaus (EMEC, RLZC)
Sp. 9 Riverside (RLZC)
Sp. 10 San Bernardino (UCRC)
Sp. 11 San Bernardino (UCRC)
Nearctic species and distribution
bolus (Walker, 1844): CAN (ON)
borealis MacGown, 1979: USA (ME)
cecidomyiae (Howard, 1885): CAN (ON, QE); USA (CN, FL, MI, NY, VA)
Remarks
Specimens at the USNM have the following characteristics: P. bolus keys to sp. 4, but in the former the club is wider and the ovipositor extends further; the holotype of P. cecidomyiae is missing the head, but Gordh nominated a lectotype that keys out to sp. 4 as well – these two taxa are quite close to each other except the club of P. cecidomyiae is ovate with a maximum width about 2x that of F6, while the club of sp. 4 has parallel sides and a maximum width only slightly more than that of F6 (4.5 : 3.5).
References
Howard, L.O. 1885. Descriptions of North American Chalcididae from the collections of the U.S. Department of Agriculture and of Dr. C.V. Riley, with biological notes. (First paper). Together with a list of the described North American species of the family. Bulletin of the United States Department of Agriculture, Bureau of Entomology 5: 47 pp.
MacGown, M.W. 1979. Two new species of chalcioid wasps (Hymenoptera) parasitic on the balsam gall midge (Diptera: Cecidomyiidae) in Maine. The Canadian Entomologist 111 (8): 940-943.
Walker, F. 1844. Descriptions of some Chalcitites of North America, collected by George Barnston, Esq. Annals and Magazine of Natural History 14: 14-17.