Discodes

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1 Head and body black …………..……………………………………………………………………………… sp. 1
1’ Head and body orange ………………………….…………………………….…………………………………… 2

2(1) Funicle without white segments ………………………………………..………..………………….. sp. 3
2’ Funicle with 1-3 apical segments white …….…………………………………..…………..……………… 3

3(2) F4-F6 white …………………….………….…………………………………………………..…………………. 4
3’ F4 dark……..……………………………………………………….…………………………………………………… 5

4(3) F1 longer than wide …………………………………………………………………………………..…… sp. 4
4’ F1 quadrate ……………………………………………………………………………………………..……….. sp. 6

5(3) Scape length about 3x width ………………………………………………………………….. arizonensis
5’ Scape length at least 5x width ……………………………………………………….……………….…………. 6

6(5) F5-F6 quadrate; head width at least 4x head length at frontovertex ……………..……… sp. 2
6’ F5-F6 length greater than width; head width about 2x head length at frontovertex ….. sp. 5

 

Sp. 1: Butte, Contra Costa, Lake. Marin, San Benito, Santa Clara, Solano, Stanislaus (EMEC, RLZC, UCD, USNM).
Sp. 2: San Benito, Santa Clara, Stanislaus (RLZC)
Sp. 3: Alpine (UCD)
Sp. 4: Marin, Sonoma, Tehama (CSCA, RLZC)
Sp. 5: Riverside (UCR)
Sp. 6: Los Angeles, AZ (RLZC, UCR)

 

Described Nearctic species and distribution

arizonensis (Howard, 1898): USA (AZ, CA, CO, NM, TX)
cowboy Sugonjaev, 1989: USA (TX)
unicolor (Ashmead, 1888): USA (FL, GA, VA)
yasnoshae Trjapitin & Ruiz Cancino, 2001: MEX (Baja California South)

 

Remarks

Discodes aeneus (Dalman, 1820) was one of a suite of species imported into California from Europe for control of Parthenolecanium corni.  Noyes (2016) recorded it from California, citing Noyes & Hayat (1994), but the latter reference, citing Bartlett, 1978, noted that this species had not established here.

 

References

Ashmead, W.H. 1888. Descriptions of new Florida chalcids belonging to the sub-family Encyrtinae. Entomologica Americana 4: 15-17.
Bartlett, B.R. 1978. Coccidae. Pp. 57-74 in Clausen, C.P. (ed.). Introduced parasites and predators of arthropod pests and weeds: a world review. United States Department of Agriculture, Agricultural Handbook 480: 545 pp.
Dalman, J.W. 1820. Försök till Uppställning af Insect-familjen Pteromalini, I synnerhet med afseen de på de I Sverige funne Arter (Fortsättning). Kungliga Svenska Vetenskapsakademiens Handlingar 41: 123-174, 177-182, 340-385.
Howard. L. O. 1898. On some new parasitic insects of the subfamily Encyrtinae. Proceedings of the United States National Museum 21: 231-248.
Noyes, J.S. 2016. Universal Chalcidoidea Database. World Wide Web electronic publication. http://www.nhm.ac.uk/chalcidoids.
Noyes, J.S. & Hayat, M. 1994. Oriental mealybug parasitoids of the Anagyrini (Hymenoptera: Encyrtidae). CAB International, Wallingford, Oxon, UK: 554 pp.
Sugonjaev, E.S. 1989. Notes on taxonomy of encyrtid-wasps (Hymenoptera, Chalcidoidea, Encyrtidae), mainly parasits of soft scale (Homoptera, Coccoidea, Coccidae) in North America and West Indies. Trudy Zoologicheskogo Instituta. Akademiya Nauk SSSR. Leningrad. 191: 90-102.
Trjapitzin, V.A. & Ruiz Cancino, E. 2001. Descripción de una nueva especie del género Discodes Foerster (Hymenoptera: Chalcidoidea: Encyrtidae) de Baja California Sur, Mexico. Biotam 12: 65-70.