Dilyta suclavata Förster (Hymeenoptera: Charipidae) found in North America and new records for D. rathmanae Menke and Evenhuis, with a key to the two species in North America

2 Pages·1994·0.49 MB·

by  K Schick

PROC. ENTOMOL. SOC. WASH.
96(3). 1994, pp. 580-581
Note
Dilyta siihciavala Forster (Hymenoptera: Charipidae)
Found in North America and New Records for
D. ralhiuanae Menke and Evenhuis, with a
Key to the Two Species in North America
Most wasps in the genus Dilyta Forster Apparently, this species occurs east of the
are hyperparasitoids whose hosts are hy- continental divide in North America.
menopterous primary parasitoids of psil- Dilyta rathnianac Menke and Evenhuis,
lids. Although one species (D. necans Kief- 1991, was described from specimens col-
fer) is listed in the Catalog ofHymenoptera lected in the state of Washington. Shortly
ofNorth America, necans was demonstrat- after the description was published, a series
ed not to be a Dilyta by Menke and Even- ofspecimens of D. rathnianac were found
huis 99 Proceedings, Entomological So- emerging from pinecone galls on Salix col-
(1 1,
cietyofWashington,93: 136-158)when they lected in Mendocino County, California, in
described the species D. rathnianac. then the UCD collection. The adult rathnianac
the single valid species for North America. may have emerged from mummies ofpsyl-
The first Nearctic specimen of the Pale- lidsCacopsyllaalba(Crawford)and C. pyri-
arcticspecies, Dilytasiibciarata Forsterfrom cola(Forster), which hosttheirprimary host,
eastern Colorado was found in the collec- the encyrtid Prionomitus mitratiis (Dal-
tion ofthe UniversityofCalifornia at Davis man), and crawled into these nearby galls
(UCD). A second specimen from the same to diapause.
locality was discovered in the United States Additional Dilyta rathantanac speci-
National Museum ofNatural History. The mens,collected from Portland, Oregon,were
latter collection also contains two speci- then found in the collection ofthe Univer-
mens ofD. subclavata from Prince Edward sity of California at Berkeley. A series of
Island and Labrador, Canada. The speci- specimens collected in Sonoma County,
mens were identified using the descriptions California, was found in the collection of
in Menke and Evenhuis, 1991. These rec- the California Academy of Sciences, San
ords establish that suhclavala is holarctic. Francisco.Therangeofthishyperparasitoid
athmanae
subclavata
Figs. 1,2. 1, Dilyta si<lKlavala female antenna and metasoma. 2, Dilyla rallimanae female antenna and
metasoma.
VOLUME NUMBER
96. 3 581
is thus shown to extend from Washington Acknowledgments
into northern CaHfomia. I thank Arnold Menke (Syst. Ent. Lab.,
ARS, USDA, % Natl. Mus. Nat. Hist.) for
assistance, inspiration and access to the
Key to North American Species of United States National Museum ofNatural
DiLYTA FoRSTER History collection. I also thank the Smith-
sonian Office of Fellowships and Grants,
1. Antennae 13 segmented (females) 2
- Antennae 14 segmented (males) 3 Darryl Ubick (California Academy of Sci-
2. Ragellomere 1 morethantwiceaslongaswide ences. San Francisco), Robert Zuparko and
and more than 'Athe lengthofpedicel(Fig. 1); Kenneth Hagen (University of California,
apparent tergum 1 has a dense field ofdeep Berkeley), and Steve Heydon (Universityof
pitsposteriorly(Fig. 1).easternNorthAmerica California, Davis) for their assistance in
subclavata
- Flagellomere 1 abouttwiceaslongaswideand providing access to collections. I thank
%orlessthelengthofpedicel(Fig. 2);apparent Michal Yuval for her assistance with illus-
tergum 1 at most with a few shallow pits(Fig. trations. I am grateful to Arnold Menke,
2); California to Washington rathmanae Robert Zuparko, Marius Wasbauer. Steve
3. Flagellomere 2 about '/: length offlagellomere Heydon, and Richard Bohart fortheir help-
p1i;taspppoasrteenritortleyr;geuamst1erhnasNoardtehnsAemefireildcaofdeep ful comments on the manuscript.
subclavata
- Flagellomere 2 about 'A length offlagellomere Katherine Schick, DepartDient ofEnto-
1;apparenttergum 1 withatmostafewshallow mology. Universily of California. Davis,
pits; California to Washington rathmanae California 95616.