Heleomyzid

occurs in California, where it has been introduced from Australia ; its larva is parasitic on scale insects in the family Marga-rodidae. This insect is about 1.5 mm., stout-bodied, with head and thorax dark metallic blue and abdomen metallic green.

FRIT FLIES Family Chloropidae Identification: Small to very small flies. Color variable, some species blackish or grayish, some brightly colored with black and yellow. Sc incomplete. Costa broken near end of R\. Anal cell lacking. Ocellar triangle usually large, shining. Postvertical bristles converging, parallel, or absent.

This is a large group, and many of its members are common flies. They occur in a variety of habitats but are most common in grassy areas. Larvae of many species live in grass stems; a few live in decaying materials. Adults of a few species (called eye gnats) are attracted to the eyes or to sores.

BEACH FLIES Family Canaceidae Not illus.

Identification: Sc incomplete. Costa broken near end of Ri. Anal cell present. Ocellar triangle large and shining, reaching to near base of antennae. Oral vibrissae present.

Canaceids are small flies, 3.5 mm. or less, occurring along the seashore, chiefly in the intertidal zone, and they are not common. Larvae feed on algae.

TETHINID FLIES Family Tethinidae Identification: Sc incomplete. Costa broken near end of Ri. Anal cell present. Sternopleural bristles present. Postvertical bristles converge. Oral vibrissae present. All fronto-orbital bristles directed outward. At least some dorsocentral bristles in anterior part of mesonotum.

This family is represented in the U.S. by 22 relatively uncommon species, most of which occur along the seashore; the inland species usually inhabit alkaline areas. The majority of the seashore species are found along the Pacific Coast. Larvae are unknown.

ANTHOMYZID FLIES Family Anthomyzidae

Identification: Similar to Tethinidae, but with at least 1 pair of fronto-orbital bristles bent upward and with no dorsocentral bristles in anterior part of mesonotum.

Anthomyzids are smallj somewhat elongate flies that occur in grass and low vegetation, especially in marshy areas. They are widely distributed and fairly common.

OPOMYZID FLIES Family Opomyzidae Identification: Similar to Anthomyzidae and Tethinidae, but postvertical bristles absent or diverging. Oral vibrissae present or absent. More stout-bodied than Anthomyzidae.

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