103 



second; sides of fiice bcHiire tlio Io\voot fi'oiital bri.stlc.s 4HMi<', ^ 

 middle tibi;TB eacli beaiiH^QTsTiigle mucro cba^ ou the tVoutside 

 near the middle; length, (5 mm. Cainden, Ark., and Los Angeles 

 County, Cal. (Annales Soc. l*]iit. France, Vol. Vllf, p. 2G0; 

 1 88S.) S^AjL^t^ti^ . . . ^-r^,: } i(u-m I.iA'ot ! . 



Od^, 



"7 



i-. 



jWith three sternopleural macrocha^ta? 2. 



("With only two sternopleural and four postsutural macrocha^ta> ; 



i middle tibiie each bearing two or more maerocha'ta'on the front /r*"** ^^^^•*^*-*i 

 side near the middle, hind tibiae outwardly ciliate; blayk, the -Uif^ (l„^.JQi: \ 

 palpi brown, the scntelluni yellow except at the base, sides of by^^^^^^^ji^ 



fm. 



first three segments of aljdomen sometimes partly yellow; front 

 in the male three- fiftlisX^!^ broad as either eye, frontal bristles 

 descending to tip of second antennal Joint, cheeks scarcely one- 

 eighth as broad as tlie eye-height, antenn;v almost as long as the 

 face, the third j'oint/jbur and onehaTtVtimes as long as the sec- 

 ond, arista, thickened on the basal third, facial ridges bristly ou 

 the lower three-fifths to three-fourths; thorax lightly gray polli- 

 nose, marked with three broad black vitta', scntellnm bearing 

 four pairs of long marginal macrocha'ta', the last pair cruciate 

 and inclined downward ; abdomen subshining, the last three seg- 

 ments liglitl}^ whitish poljinose, the extreme apices of the seg- 

 ments bare, the bristly hairs rather long and almost erect, first 

 two segments each bearing a nuirgiual pair of macrocha^ta', the 

 third with a marginal row, the fourth wholly covered except the 

 extreme base; front pulvilli slightly longer than the last tarsal 

 joint; wings hyaline, the base to apex of second basal cell gray, 

 ^ ^ "^^ third vein bearing two bristle^ at its base; calypteres whitish; , . 



length, C to 9 mm. JMichigaivvind Missouri. Three nuile speci- '^''^^^'^^^^''''''^ 

 mens. Type No. ."JOOo, U. S. National ^rnseum.'^fo/'/>i('/.s' n. sp. 

 K 2. Thorax bearing three postsutural macrocha'ta^ 3. 



Thorax bearing lour postsuturals, hind tibia' ontwardly ciliate, 



second and third segments of abdomen bearing discal macro- 



cluTjta', several macrocha'ta* outside of the frontal bristles. . . G. 



3. Hind tibiiB outwardly ciliate, scntellnm bearing fonr marginal pairs 



of macrocha'ta' 5. 



\ Hind til)ia' not ciliate, scntellnm bearing only three pairs of mar- 



ginal macrochsette, body slender, last three segments of abdomen 

 destitntc of x>ollen on the broad apices, pollen of face white. . 4. 



Second and third segments of abdomen destitute of discal macro- 

 cha^ta', middle tibijc each bearing only one macrocha^ta on th.e 

 front side near the middle; length, 7 mm. Utica, Miss. (F>iol. 

 Cent.-Amer., Diptera, Vol. II, p. 84; Feb., \i>*M).) .macra v. d. W, 



Second and third segments of^ibdomen bearing discal macroclneta', u -^y, /• 

 middle tibia' each bearingAtwo on the front side near the 'tv^v^' 

 middle; length, mm. Newark, N". J. (Biol. Cent.-Amer., ^^ ^ c^ 

 Diptera, Vol. U, p. 7*J ; February, 18'JO.) rujilabris v. d. W. ^ ' 



r^O^- 



^-^^-U-^. 



yj^^. ^t^ w ^ 



3 -wv . A-^W. 



^ IX. ^.^^^rr^ 



