44 
Canon City, Colo.; Las Oruces, N. Mex. ; Washington; Los 
Angeles and San Diego counties. Gal.; and Allende, Mexico. 
(Insecta Saundersiana, Vol. I, p. 260; 1850: Hyalomyia. Alo- 
phora tuctuosa Bigot, Anuales Soc. Entomol. France, p. 255; 
1888. Hyalomyia punetigera Townsend, Proc. Ent. Soc. Wash- 
ington, Vol. II, p. 135; April 2, 1891. Hyalomyia aldrichii 
Townsend, 1. c, p. 136; from a cotype specimen. Hyalomyia 
robertsonii Townsend, 1. c. Hyalomyia purpurascens Townsend, 
1. c. p. 137; from a cotype specimen. Hyalomyia celer Town- 
send, Trans. Araer. Ent. Soc, Vol. XXII, p. 65; March, 1895. 
Hyalomyia violascens Townsend, Annals Mag. Nat. Hist., Vol. 
XX.]). 32; July, 1897. Phorantha sp., Brauer and Bergen stain m 
in lift.) occidentis Walk. 
Calypteres brown, first three segments of abdomen not distinctly 
pollinose except along the sides, the fourth segment lightly 
whitish pollinose and dotted with black, frontal vitta of male 
obliterated on its upper part, wings with a strong whitish tinge; 
length, 3.5 to 4 mm. District of Columbia; Potomac Creek, 
Virginia; Lexington. Ivy.; and northern Illinois. Nine males, 
one taken by the writer in .July, another captured by Mr. 0. W. 
Johnson, May 23, L896, a third by Dr. W. A. Xason, August 10, 
L895, and six captured by Prof'. H. Gar man. Type Xo. 3518, 
U. S. National Museum calyptrata n. sp. 
Genus AL0PH0RA Desv. 
Alophora Desvoidy, Essai snrles Myodaires, p. 293; 1S30. 
Hyalomyia Desvoidy. loc. cit., p. 298. 
Schiner'has already referred these two divisions as subgenera of 
the first-mentioned genus, and in this he is followed by Brauer and 
Bergenstamm. 2 Of* ihe ten species occurring in our fauna, the females 
of only four are known to me: 
1. Wings distinctly marked with brown beyond base of discal cell out- 
side of the costal cell (all males) 6. 
Wings wholly hyaline beyond base of discal cell except sometimes 
in the costal cell 2. 
2. Second and third abdominal segments shining or snbshining 3. 
Second and following segments opaque, densely yellow gray polli- 
nose ; thorax, when viewed from behind, thinly white pollinose 
along the suture, in front of the scutellum, and along the sides; 
eyes contiguous: black, the palpi yellow, calypteres white, wings 
whitish hyaline, costa strongly arcuate, last section of third 
vein slightly less than one-third as long as thepreceding section; 
length, 5 mm. Eastern Washington. A single male specimen 
collected by Professor Piper. Type 2so. 3519, U. S. National 
Museum - opaca n. sp. 
1 Fauna Austriaca. Vol. I, p. 402; 1862. 
Also loc. cit,, VI, p. 157; 1893. 
