Rachicerus honestus Osten Sacken 1877

Rachicerus honestus Osten Sacken
1877. Rachicerus honestus Osten Sacken, Bui. U. S. Geol. Surv., in, p. 211.
1905. Rhachicerus honestus Aldrich. Cat. N. Am. Dipt., p. 212.
Antennae twenty-two to twenty-three segmented, black, subpectinate; thorax brownish yellow, with two broad brownish stripes; abdomen dark brown; legs yellowish; wings faintly tinged with brownish.
Male. — Length, 5.5 mm. Head: Vertex, front and face shining black, except the usual silvery patch above the antennae; palpi described as "yellow" — I would say brownish with tip yellow; proboscis brownish yellow; antennae black, first to third segments somewhat tinged with reddish especially inside and with twentyone to twenty-two segments, subpectinate on the lower side (a little longer than above).
Thorax: Mesonotum brownish yellow with two broad sublateral brownish stripes which do not quite reach either the anterior or posterior margins; pleura brown above, brownish yellow below (not "brownish on underside"); halteres yellowish, slightly darker at base of knob. Scutellum brownish; metanotum on sides dark brown, in middle highly polished, inside the sutures dirty yellowish with a small dark brownish spot on median line.
Abdomen: Dark brown, instead of "with a delicate grayish-yellow pubescence," and I would say with short appressed yellowish hairs.
Legs: Wholly yellow, including coxae; tip of tarsi slightly darkened.
Wings: Uniformly lightly tinged with brownish; veins dark brown. Female. — Allotype, California, [U. S. N. M.]. (Here described for the first time.) Length, about 8 mm. Similar to male except the antennal segments are not produced below more than above. Both antennae are broken one having only four segments, the other, eighteen.
Specimens Examined: 8 ; 6 males, 2 females.
California: i d 1 9, [U. S. N. M.; the 9 is the allotype]. 3 d 1 9, Blair's Rock, Redwood Creek, Humboldt County, June 9 and 10, (H. S. Barber), [U. S. N. M., 1 d"; C. U., 1 d 1 9]. id", Lagunitas, Marin County, July 5, 1909, (E. C. Van Dyke), [A. N. S. P.]. 1 d San Raphael, May 29, (Osten Sacken), [M. C. Z.; type].

Rachicerus honestus is a species of fly in the family Xylophagidae.