Description of female
Chromolepida bella Cole
(Diptera: Therevidae)

Redescription of holotype male
(MEI 009177). Body length 4.0 mm.

Head. Length 0.8 mm. Ocellar tubercle dark reddish brown, silver pruinose; setae dark reddish brown. Eyes dull reddish brown; medial margin rounded. Frons dark reddish brown, glossy, with lateral silver pile and black dorsal pile, dorsal pile becoming silver dorsally. Antenna dark reddish brown, pruinose; setae dark reddish brown; macrosetae dark brown; length of antenna 1.4 times head length; length of scape 0.75 mm, 9.3 times width, 4.4 times length of pedicel; length of pedicel 0.11 mm, 1.1 times width; length of flagellum 0.34 mm, 3.4 times width, 0.4 times length of scape; length of basal stylomere 0.05 mm. Parafacial dark reddish brown, glossy with silver pile along lateral margins. Maxillary palpus pale brown; length 0.28 mm, 2.8 times width; setae pale yellow.

Thorax. Macrosetae: np 3. Dark reddish brown, pruinose. Postpronotal setae white, filiform and scale-like. Prosternal setae white. Pleura dark reddish brown, pruinose, anepisternum and ventral half of katepisternum glossy; setae white, filiform, scattered on propleuron and dorsal half of katepisternun, pale yellow, filiform, over entire anepisternum, scale-like over propleuron, anepisternum, and dorsal half of katepisternum. Scutellum dark reddish brown; setae white, filiform, and scale-like. Laterotergite dark reddish brown, pruinose; setae dark white to pale yellow, filiform.

Wing. Length 3.2 mm, 2.7 times width; pale yellow, opaque; pterostigma indistinct. Halter dark yellow, stalk darker.

Legs. Coxae dark reddish brown, pruinose. Femora dark yellowish brown. Fore tibiae dark reddish brown, middle and hind tibia dark yellowish brown. Tarsi dark brown. Coxal and femoral setae white, filiform and scale-like; tibial setae dark reddish brown.

Abdomen. Dark reddish brown; setae white, filiform, more abundant laterally than dorsally, and white, appressed, lanceolate, more abundant along posterior margins.

Terminalia. Dark yellow. Sternite 8 moderately reduced, posterior margin slightly concave. Gonostylus lacks lateral projection. Dorsal apodeme of aedeagus broad anteriorly, wider than ventral apodeme, anterior slightly emarginate; distiphallus elongate, sinuate.

Variation in Males. Body measurements for males are provided. Considerable variation in coloration was noted between the holotype and most males of this species. Specimens in the San Francisco area and from Inglenook Fen appeared to be smaller and more slender in size than specimens inland from the coastal dune habitats where the holotype was collected. Head. Antenna reddish brown, pruinose, paler on basal half of scape; setae reddish brown. Maxillary palpus dark reddish brown. In one specimen (MEI 009045), a few frontal setae were noted at base of antenna. Wing. Membrane pale yellow. Halter dark yellow. Legs. Femora dark reddish brown, apical half dark yellow. In one specimen (MEI 009037), the legs were entirely dark reddish brown, subshiny. Abdomen. Tergite 1 dark reddish brown, tergites 2-8 dark yellow; setae white, lanceolate, dense dorsally on tergites 1-3. Terminalia. The contour of the lateral margin of the epandrium varies from specimen to specimen.

Description of Female
Similar to male with following exceptions. Body measurements for females given.

Head. Frons dark reddish brown, glossy dorsad of antennal bases, with dark gray pile lateral to antennal bases with silver, medial, pruinose band and a circular area of black pile dorsolateral to antennal bases; setae absent.

Thorax. Macrosetae: np 3. Setae white, elongate, with scattered reddish brown setae.

Legs. Femora dark yellowish brown, becoming dark reddish brown basally on middle and hind femora.

Abdomen. Dark yellowish brown, subshiny; setae dark reddish brown, filiform and scale-like.

Terminalia. Sternite 8 with posterior margin bilobed medially. Furca subrectangular; length 0.5 mm; anterior margins broadly rounded; posterior margin biconcave; lateral margins sinuate.

Variation in Females. In specimen (MEI 009047) scutellum with 5 macrosetae. In specimen (MEI 009036) femora dark reddish brown, apical half of fore and middle femora dark yellow. Specimens in the San Francisco area and from Inglenook Fen appeared to be smaller and more slender in size than specimens collected inland and away from coastal dunes.

Text from Webb & Irwin 1995

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