Length: typically 7-8 mm
Sabrosky (1969) lists the characteristics of the genus Juriniopsis, and they include bare eyes, a lack of ocellar bristles, and palpi that are elongate “and somewhat spatulate.”
D.M. Wood, writing the Tachinid manual in McAlpine (1987), described some key characteristics of the genus: “Abdominal tergites 3 and 4 without median discal bristles; tergite 3 with 3 to 5 pairs of short stout median marginal bristles; the longest of these no more than twice as long as the shortest.”
Juriniopsis adusta has been reported as a parasite of two moth species, one a Tiger Moth (Hypercompe deflorata), the other a skipper (Epargyreus clarus).
The map below shows the states reporting Juriniopsis adusta. The species has also been reported from Mexico and Central America, but not from Canada.
Length: 8-11 mm to apex of abdomen
Morrison (1940) gave several key characters of genus Gonia, including: “head very much inflated (except in G. distincta Smith), yellowish except on the occiput and the eyes, … ocellar bristles strong and curved backward, orbitals present in both sexes, eyes bare.”
Gonia frontosa is parasitic on caterpillars in the family Noctuidae. The microtype eggs are laid on foliage, where the caterpillar consumes them and the fly larvae develop internally. There is also at least one record of Gonia frontosa parasitizing a Blister Beetle, Tetraonyx quadrimaculata (the name is also given as Tetraonyx quadrimaculatus).
Gonia frontosa was the first American species described in the genus. Its author was the great naturalist Thomas Say, who penned his description of this interesting group in 1829.
Morrison (1940) mused, “Considering the widespread distribution of this species, it is probably the oldest form, phylogenetically speaking.”
Length: typically 16-19 mm
Flies in the genus Belvosia all have gold pruinescence on the fifth abdominal tergite, and often on the fourth too.
Species in the genus Belvosia parasitize the larvae and pupae of moths in a variety of families. Sphingidae and Satuniidae are among the most important host families; other parasitized Lepidopteran families include Noctuidae, Hesperiidae, and Citheroniidae (Arnaud, 1978).
Belvosia flies are at their peak adult numbers in West Virginia from early July through mid-August.