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Genus Dalmannia

Fly - Dalmannia vitiosa Fly - Dalmannia pacifica Dalmannia or Thecophora? - Dalmannia blaisdelli - female fly - Dalmannia nigriceps fly - Dalmannia nigriceps Conopidae - Dalmannia nigriceps Either blaisdelli or picta - Dalmannia blaisdelli - female thick-headed fly with bright yellow legs - Dalmannia nigriceps
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon ("Acalyptratae")
Superfamily Sciomyzoidea
Family Conopidae (Thick-headed Flies)
Subfamily Dalmanniinae
Genus Dalmannia
6 spp. in our area (From (1), and ITIS Dalmannia page)
Some generic characters are: shiny black body with bright yellow markings; dorsal arista; anal cell short and only slightly longer than 2nd basal cell; long proboscis bent in middle, with distal half folding back; ovipositor long-tapered, incurved and folded up under the abdomen.
The (clickable) wing diagram below illustrates the generic wing pattern for Dalmannia. The anal and 2nd basal cells are labelled cup and bm, respectively:

Note that the cross-vein separating cells bm and dm is sometimes broken anteriorly.
Bohart commended as excellent the diagostic description for the genus given by Williston here.
Print References
Bohart, G. E. (1938). Synopsis of the genus Dalmannia in North America (Diptera, Conopidae). Pan-Pac. Ent. 14(3): 132-136. (PDF of typed transcription...with equivalent text, but not the original typeset journal article!)
Camras, S. & P. Hurd (1957). The Conopidae flies of California, Bull. Cal. Insect Surv. 6(2) 19:49, (2)
Internet References
Small images of pinned Dalmannia species from the Canadian National Colletion of Insects
Works Cited
1.A Catalog of the Diptera of America North of Mexico
Alan Stone, et al. 1965. United States Department of Agriculture.
2.The Conopid Flies of California
Sidney Camras and Paul D. Hurd, Jr. 1957. University of California Press.