236 KOTES. 



Thorax black, opaque; the dorsum clothed with white hairs, forming 

 four longitudinal bands, especially visible from a side view. First seg- 

 ment of the abdomen black, opaque, clothed with long, soft, erect white 

 hair, which reaches down to the hind coxae; second segment shining, 

 yellowish red, the remainder of the abdomen black, moderately shining. 

 Venter black, except the second segment, which is yellowish red. 

 Halteres and feet black, pulvilli brownish (of a darker color than in 

 31. clctvatus). Wings strongly tinged with brown, and with a slight 

 purijlish reflection. Venation like that of M. daratus. 



Belongs to Gerstaecker's first tribe, that is, it has spurs at the tip 

 of the tibiae and a small cross-vein on the posterior border of the wing. 



A single male discovered in the environs of Mammoth Cave in 

 Kentucky, by Mr F. G. Sanborn, in June, 1874. 



Ilidasi carhonifer 0. Sacken, 1. c. $. — Altogether black, thorax 

 opaque, abdomen shining, wings brown. Levgtli : 22 mm. M'tiirf: 18 mm 



Black, front and ejiistoma shining, beset with black hair; antennae 

 black, the expanded portion of the third joint brownish, and beset with 

 a fine grayish pollen. Thorax opaque above, showing two velvety black 

 longitudinal lines. Abdomen black, shining, except the first joint, which 

 is opaque. Feet black; ungues reddish, with black tips; hind tibiae 

 beset with strong spines, except toward their base; terminal spur strong. 

 Halteres black; wings dark brown, with a violet reflection; the brown 

 somewhat fainter in the centre of several cells, and along the posterior 

 margin. Small cross-voin on posterior margin present. 



Habitat, Norton's Landing, Cayuga Lake, N Y. A single female 

 taken in July by Mr J. II. Comstock. This species seems not unlike 

 M. crassipes Westw. in coloring, but is much smaller, has much darker 

 wings, an opaque (and not shining) thorax, etc. (I never saw West- 

 wood's species.) 



3Ii(las ehnjftofitomus 0. Sacken, 1. c. c?. — Black, face with a tuft 

 of gulden hair, abdominal segments '2, 3, 4 with red margins posteriorly, 

 legs black, wings tinged with brown. Leiifith: 23—80 mm. Wiitfi: 21 mm. 



Black; the incrassated portion of third antennal joint dull reddish, 

 except the tip, which is blackish. Face with a tuft of golden yellow 

 hair. Thorax of a smoky black, opaque above. Abdomen black, shining, 

 except the first segment, Avhich is opaque; a narrow band on the 

 posterior margins of the 2d, 3d and 4th segments rufous, edged with 

 yellow along the margin : on the 4 th segment this band is much 

 narrower and somewhat indistinct in the middle. Feet black; hind 

 tibiae with a strong spur; hind femora with two rows of short, but 

 strong spines on the underside; ungues dull reddish, tipped with black. 

 Halteres black. Wings strongly tinged with brown, although less so 

 than in 31. clavot^ts. Small cross-vein on posterior margin present. 



Habitat, Dallas, Northern Texas. A single male collected by Mr. 

 Boll. This species seems to have many characters in common with 31. 

 fukifrons lUig. but it differs in the coloring of the abdomen. 



140. Bibio illucens. Fabricius, in the System. Ent., perhaps in 

 consequence of a lapstts calami, writes illucens for fduta and vice 



