N<». (U) diptj:ra of conxecticit: taxonomy 477 



Male hypopygium with ventral lobe of basistyle unarmed; both dististyles 

 simple, placed close together near apex of basistyle; mesal lobe of basi- 

 style conspicuously developed and provided (except in auricoinus) with a 

 dozen or more black spines or spinous setae (gracilis group) (Fig. 55. 

 B, D, E, G, H, J, K, L) " 5 



2. Antennae ( 5 ) of moderate length, if bent backward extending about to root 



of halteres. the flagellar segments clothed with a long white pubescence.. 3 

 Antennae short in both sexes, ending opposite or before wing-root ; male 

 hypopygium (Fig. 55, F) with the basal dististyle bearing a simple acute 

 spine on outer face at near one-third the length hirtipennis 



3. Male hypopygium with the basal dististyle a long straight unbranclu-d md 



(Fig. 55, I); size very small (wing. 3.5 mm. or less) nova-caesariensis 



Male hypopygium with the basal dististyle variously branched : ( 1' ig. 55, C 

 M) ; size larger (wing, 4.5 mm. or more) 4 



4. Male hypopygium with the basal dististyle terminating in lour acute spines 



(Fig. 55, M) quadrispinosus 



Male hypopygium with the axial stem of basal dististyle bearing a single long 

 slender spine on inner face at near midlength (Fig. 55, C) crainptoni 



5. Wings with distinct brown seams along vein Cu and over ni-cii soror 



Wings immaculate ^ 



6. Male hypopygium with mesal lobe of basistyle without blackened points, all 



setae being long and pale in color ; dorsal lobe of basistyle very slender 

 (Fig. 55, B); both dististyles appearing as long slender rods, acute at 



(^jpg auricomus 



Male hypopygium with mesal lobe of basistyle set with blackened spinous 

 points or elongate spiniform setae; dorsal lobe of basistyle stout ; both 

 dististvles short and more or less curved (Fig. 55, D, F. (>. H, J. K, 

 L) .'. ' 



7. Antennae (S) short, if bent backward not attainmg the wnig-root : male 



hypopygium (Fig. 55, D) forc.pulus 



Antennae ($) elongate, if bent backward extending to base of abdomen or 

 beyond ■' i' '{ 



8. .\ntennae ( S ) relatively short, approximately one-half tlie lengtli ot body. 



or extending about to base of abdomen • • -'. 



Antennae (S) longer, if bent backward extending approximately to mid- 

 length of abdomen • • • i \" ',' "■ 



9 Dorsal lobe of basistyle unusually long, extending caudad beyond levc ot 



apex of outer dististyle; vestiture of mesal lobe consisting ot smal black 

 spines • outer dististvle conspicuously roughened, both on inner and t)Uter 

 margins ; inner stvie with a few microscopic spinulae on concave margin 

 before the long black apical point (Fig. 55. K) ; size small (w. S. <i''o»J^„^^ 



3.5 mm.) .■.■■■,■■,■ / t ' ' ' ,- Mt, li • 



Dorsal lobe of basistvle small, extending caudad only beyond ba>e. ot st> . 

 festiture of mesal iobe consisting of elongate spines or long spinous setae 

 outer dististyle almost smooth, with relatively few microscopic P"''" ; 

 ImZ stvle stTtooth (Fig. 55, H) ; size larger (w. 6 . aboiU 5 mm.) . '^^^'"'^ 



10 rostal fringe (?) light golden-yellow, of S somewhat darker, light broxxn. 



''■ ^rath;;%yglm/witl^he outer dististyle glabrous, except 'or .. ^tew^^^^ 



C^^i^ Cl^r ;?;\i^'^2-; maf;\ypopVgium\dth-the-outer .listi- 

 stl pro?l^ded with abundant microscopic setulae on distal half ..r more ^^ 



11. Ml^t5^pSiSn{:ith-theoute^cl^tistyle;rel^ 



elongate ; spines or spinous setae ot mesal tone fuHonensis 



conspicuous (Fig. 55. K) j-' I-' / i ' \'..';,'ipr ■ ^niiies of mesal lobe of 



Male hypopygium with the outer dist. style w.der^^ somes ot m ^_ 



12. Si 



