76 DIPTERA 
15. Base of third antenmal joint elliptical; halteres of female pale; 
middle tibi; with paired bristles at basal fifth and two-fifths ; 
four scutelleg i. s . . B.iNTERMEDIA, Lundbeck. 
Base of third antennal joint fures bristles of middle tibiee 
smaller; six or eight scutellars. . . - . B. LUGUBRIS, nov. sp. (1) 
16. Tines of the U-shaped pygidial fork long, thin e Bed with 
microscopic hair . . . - . « « B. NiGRA, Meigen. 
Tines stronger and tipped with one dong id ier short hairs ' B. PECTINATA, nov. sp. (2) 
Geographical distribution. 
1. B. alfina, Bezzi, Ditterofaun. nivale, p. 75 (1918). AE Alps. 
2. B. angustifurca, nov. sp. W. United States. 
3. B. ? aterrima, Roser, Correspondenzbl. Landw. Ver. Würtemb. Stuttgart, C. Europe. 
Vol. 1, p. 55 [1840] (Cyrtoma). 
4. B. brevifurca, nov. sp. — PI. 8, Fig. 72g. Washington. 
5. B. ? collina, Philippi, Verh. Ges. Wien, Vol. 15, p. 768 [1865] (? Cyrtoma). Chile. 
6. B. disar, Oldenberg, Zool. Jahrb. Vol. 43, Syst. p. 221 (1920). Alps. 
7. B. furaáfer, nov. sp. — PI. 8, Fig. 72a. W. North America. 
8. B. halteralis, Loew, Berl. Ent. Zeitschr. Vol. 6, p. 206 : Cent. 2, E. United States. 
No. 46 [1862] (Cyrtoma); Melander, Trans. Amer. Ent. Soc. Vol. 28, 
p. 335 [1902] (Cyrtoma). 
9. B. intermedia, Lundbeck, Dipt. Dan. Vol. 3, p. 25 (1910); Collin, Ent. N. Europe. 
Mag. London (2), Vol. 24, p. 104 (1913). 
nigra, Zetterstedt, part. Dipt. Scand. Vol. 1, p. 33o, part. [1842] (Cyrtoma). 
1o. B. longibes, Loew, Berl. Ent. Zeitschr. Vol. 6, p. 206 : Cent. 2, No. 47 North America. 
[1862] (Cyrtoma) ; Melander, Trans. Amer. Ent. Soc. Vol. 28, p. 336, 
f. 71 [1902] (Cyrtoma). — PI. 8, Fig. 72b. 
11. B. lugubris, nov. sp. — PI. 8, Fig. 72d. W. United States. 
12. B. melena, Haliday, Ent. Mag. Vol. 1, p. 158 [1833] (Cyrtoma); Walker, N.and C. Europe. 
List Dipt. Brit. Mus. Vol. 3. p 489 (1849); Ins. Brit. Dipt. Vol. 1, 
p. 116 [1851] (Cyrtoma) ; Lundbeck, Dipt. Dan. Vol. 3, p. 22 (1910). 
simplicipes, Zetterstedt, Dipt. Scand. Vol. 1, p. 331 [1842] (Cvrtoma) ; Bonsdorff, 
Finl. tváv. Ins. Vol. r, p. 157 [1861] (Cyrtoma); Schiner, Fauna Dipt. 
Aust. Vol. 1, p. 76 [1862] (Cyrtoma): Wahlgren, Ent. Tidskr. Vol. 31, 
P. 48 (1910); Collin, Ent. Mag. London (2), Vol.24, p. 105[1913](Cyrtoma). 
(1) Bicellaria lugubris, nov sp. — Male. Length 2,75 mm. Very black, all bairs and bristles black. Upper 
facets large, about fourteen along the line of contiguity of the eyes. Base of third antennal joint rather quadrate, about 
equal in length to the splender apical part, arista more than two-thirds the length of the third joint. Anterior hairs of notum 
short, posterior four dorsocentrals longer than the others, six to eight scutellars. Pygidium narrowly U-shaped, tines 
moderately thick, about three times as long as width at middle, tips rounded and bearing a small hair. Hind femora 
appearing ciliate, with about eighteen setze in anterior flexor row and fifteen in extensor row, hind tibim subclavate, 
their extensor hairs irregular with two or three longer than the others, hind metatarsi slightly thicker than the following 
joint. Halteres black. Wings infumated, stigma brown, fork of fourth vein open, the pedicel shorter than the 
fourth vein. 
Nine males taken along Indian Creek in the northern part of Yellowstone Park, Wyoming, July 8, 1923. A 
female from the Gallatin Station in the northwestern part of Yellowstone FOE, July 28, 1923, is probably the same 
species. 
(2) Bicellaria peotinata, nov. sp. — Length 3.5 mm. Large black species with all hairs and bristles black. 
Upper facets large, about twelve along the line of contiguity of the eyes. "Third antennal joint slender, the base ovate 
and rounding into the apical part, arista two-thirds the length of the third joint. Notum subshining, anterior hairs 
short, two dorsocentrals, four or six scutellars. Pygidium with rounded V-shaped incision on ventral fork, the tines 
moderately short and strong and tipped with one long and several short hairs, Sete of hind femora very long, about 
eighteen in the anterior extensor row and twenty-two in the flexor row ; hind tibiz distinctly clavate, the extensor 
hairs irregular ; hind metatarsi twice as thick as the second joint. Halteres black. Wings infumated, stigma brown, 
fork of fourth vein open, the pedicel subequal in length to the fourth vein beyond. 
Thirty-four specimens, Ilwaco, Washington, May-September. 
