. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Hygroceleuthus ciliatus Aldrich. Afa/e. Length mm. Face yellowish-white. Front green. Antennae black, except lower half of first and second joints. Arista bare. Post- ocular cilia black on upper third, below nearly white. Sides of first abdominal segment with a few white hairs. Tips of hind tibiae blackish. Tarsi simple, black from tip of first joint. Wings narrow, hyaline, costa not thickened at tip of first longitudinal. Indention at tip of fifth vein slight. Tegulae with long black cilia. Female. Length mm. Fa
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Hygroceleuthus ciliatus Aldrich. Afa/e. Length mm. Face yellowish-white. Front green. Antennae black, except lower half of first and second joints. Arista bare. Post- ocular cilia black on upper third, below nearly white. Sides of first abdominal segment with a few white hairs. Tips of hind tibiae blackish. Tarsi simple, black from tip of first joint. Wings narrow, hyaline, costa not thickened at tip of first longitudinal. Indention at tip of fifth vein slight. Tegulae with long black cilia. Female. Length mm. Face yellowish-gray. Arista of antennae bare. Hind tibiae wholly yellow. First joint of hind tarsi lighter at base. Tegular cilia black. Wings with a distinct in- cision at tip of fifth vein. Numerous specimens examined from South Dakota and Wyoming. FlG' m'~H' "liahts: a'male; b> female< Hygroceleuthus idahoensis Aldrich. Male. Length mm., of wing mm. Face silvery. Antennae black, not large but with swollen yellow pro- tuberance on inner side ; second joint slightly yellow on inner side; arista rather stout. Vertex blue-green. La- mellae of hypopygium small, white, with rather wide black margin. Anterior coxae yellow with a dark green stripe on outer face, and with a few hairs on lower part. Hind tibiae incrassate with a longitudinal depression. Tarsi black from tip of first joint. Costa thickened for a long distance, the incision in hind margin slight. Tegular cilia pale, not large. Female. Face broader, darker than in the male. Anterior coxae more hairy. Wings less yellow anteriorly, costa not thickened. Tegular cilia larger, black with a slight admixture of pale FIG. ii. — //. idahoensis : a, male ; l>, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biologica
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
