44 



Canon City, Colo.; Las Cruces, N. Mex.; Washington; Los 

 /Ccy"-— ^ ^^-^ - Angeles and Sau Diego counties, Cal.; and AUende, Mexico, 

 lb 'vv-t'^u-J— tJ^^ S>v - (lusecta Saundersiana, Vol. I, p. 200; 185G: Jlynlomyia. Alo- 

 ^'^^^'^f^*^ j^6»^. pJwra lucfuosa Bigot, Aunales Soc. Kntoniol. France, p. 255; 

 ^aT,«r«-*-o— ^j •^'^'^•1888. Rj/alomyia 2iuncti(/era Townsewd, Proc. Ent. Soc. Wash- 

 ington, Vol. II, p. 135; April 2, 1891. Hyalomyia aldrichii 

 Townsend, 1. c, p. 136; from a cotype specimen. Hyalomyia 

 roherfsonii TownsQud, 1. c. Hyalomyia purpurascenH Townsend, 

 1. c, p. 137; from a cotype specimen. Hyalomyia celer Town- 

 send, Trans. Amer. Ent. Soc, Vol. XXII, p. 65; March, 1895. 

 IlyaJomyia riolascens Townsend, Annals Mag. Xat. Hist., Vol. 

 ■ XX, p. 32 ; July, 1897. Fhorantha sp., Brauer and Bergenstamm 



in litt.) occidenfis Walk. 



Calypteres brown, lirst 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 ui^per part, wings with a strong whitish tinge; 

 length, 3.5 to 1 mm. District of Columbia; Potomac Creek, 

 Virginia; Lexington, Ky. ; and northern Illinois. Nine males, 

 one taken by the writer in July, auotlier captured by Mr. C. W. 

 Johnson, May 23, 1896, a third by Dr. W. A. Nason, August 16, 

 1895, and six captured by Prof. H. Garman. Type No. 3518, 

 U. S. National Museum calyptrata n. sp. 



Genus ALOPHORA Desv. ^ f K ^ i".*. ^ -«Tv. 



Alophora Desvoidy, Essai sur les Myodaires, p. 293; 1830. 

 Hyalomi/ia 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.^ Of the ten species occurring in our fauna, the females 

 of only four are known io me: ' €' 1^' *T^' Sl7 Z^'*' 



1. Wings distinctly marked with brown/J^eyonu base of discal cell out- 

 side of the costal cell (all males) G. 



Wings wholly hyaline beyond base of discal cell except sometimes 

 in the costal cell 2. 



2. Second and third abdominal segments shining or subshiniug 3. 



Second and following segments opaque, densely j^ellow 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 j-ellow, calypteres white, wings 

 whitish hyaline, costa strongly arcuate, last section of third 

 vein slightly less than one-third as long as the preceding section ; 

 lengtli, 5 mm. Eastern Washington. A single male specimen 

 collected by Professor Piper. Type No. 3519, U. S. National 

 Museum opaca n. sp. 



'Fauna Austiiaca, Vol. I, p. 402; 1862. 



^Zwcif. Kais. Mus. Wieu, IV, p. 149; 1889. Also loc. cit., VI, p. 157; 1893. 



