. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. 20. — D. renides- cens: male wing and lamella. broad. Antennae dull black, sericeous, short, with slender, dark, sericeous arista, once and a half the length of the antenna ; third joint a little shorter than the first two together, broadly oval, rounded but obtusely pointed at apex; second joint with circlet of hairs. Front violet. Upper seven of postocular cilia black, rest pale yellow. Thoracic dorsum bluish-green, brilliantly shining except for indications of longitudinal dusted rows ; scu- tellum and ante-scutellar
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. 20. — D. renides- cens: male wing and lamella. broad. Antennae dull black, sericeous, short, with slender, dark, sericeous arista, once and a half the length of the antenna ; third joint a little shorter than the first two together, broadly oval, rounded but obtusely pointed at apex; second joint with circlet of hairs. Front violet. Upper seven of postocular cilia black, rest pale yellow. Thoracic dorsum bluish-green, brilliantly shining except for indications of longitudinal dusted rows ; scu- tellum and ante-scutellar region purer green. Abdomen shining green, with brassy tinge, lightly dusted. Pleurae glaucous on a green foundation. Middle and hind coxae, except tip, and extreme base of fore coxae of same color as pleurae. Front coxae with black pubescence on anterior face. Legs largely yellow, the hind femora with two ante- apical bristles ; fore and middle legs dark from tip of first tarsal joint; hind tarsi black, hind tibiae infuscated at tip. Wings hyaline, normal, a slight sinus at tip of fifth longitudinal. Tegulae yellow with rather long black cilia. Halteres yellow. Male. Face ferruginous. Hypopygium piceous with brassy green tinge; sericeous below, shining inwardly ; internal ap- pendages yellow. Lamellae clavate, broad, white translucent, rather broadly margined with black at extremity, apex jagged and fringed with rather long, slender, nearly straight, black hairs. Hind tibiae with a long, narrow glabrous streak, more evident near tip, on hind face. Anal angle of wing full; costa thickened at junction with humeral vein. Female. Face with gray dust. First antennal joint a little longer than in male. Hind tibiae not glabrous, the apical infuscation not evident. Anal angle of wing rounded ; costa not thickened. Two males and one female from North Park, Colorado, col- lected at an altitude of over 9000 feet during July. The shorter antennae, broader face, violet front, more ex- t
Size: 1232px × 2027px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
