No. 64] DiPTERA OF CONNECTICUT : taxoxo:mt 223 



9. Posterior vertex obscure yellow, with a broad median darkening that at- 

 tains the margin of the eye or nearly so ; wings tinged with brownish, 

 especially along cord and in apical portion: flagellar segments ($) strong- 

 ly incised penumbra 



A narrow black median stripe on the otherwise bright-colored posterior 

 vertex ; wings clear light yellow ; flagellar segments ( $ ) less strongly 



incised vittula 



jO. Mesonotum opaque or nearly so 11 



Mesonotum polished 19 



11. Wings with macrotrichia in cells hirsutula 



Wings without macrotrichia 12 



12. Lateral and caudal margins of abdominal tergites black., .macrocera dietziella 

 Abdominal tergites not so patterned, with linear black lateral dashes 13 



l.v Antennae ( S ) elongate, if bent backward extending to beyond midlengtli of 



abdomen 14 



Antennae short in both sexes 16 



"J4. ^lale hypopygium with the Sth sternite terminating- in a median cone 



macrocera gnata 

 Male hypopygium witli the 8th sternite terminating in two finger-like lobes. 15 



J 5. Flagellar segments bicolorous macrocera macrocera 



Flagellar segments uniformly dark brown or black macrocera atrocera 



J6. Male hypopygium enlarged; inner dististyle appearing as a conspicuous ser- 

 pentine rod cornifera 



\Iale hypopygium small ; inner dististyle inconspicuous 17 



J7. Antennal flagellum entirely dark brown tenuis nigroantennata 



Antennal flagellum weakly bicolorous ; bases of segments restrictedly yellow- 

 ish " 18 



J8. Appendage of aedeagus small, inconspicuous tenuis tenuis 



Appendage of aedeagus large and protuberant, strongly elbowed, .tenuis hamata 



J9. Lateral praescutal stripes curved laterad into an opaque velvety-black spot.. 20 



Lateral praescutal stripes not as above 23 



20. Occiput opaque, immaculate punctum 



Occiput with polished brand 21 



21. Flagellar segments weakly bicolorous: a brown median line on anterior 



vertex calinota 



Flagellar segments unicolorous : vertex unmarked 22 



22. Alesonotal scutum with a narrow^ black median stripe : antennal flagellum 



blackish opacivittata 



Mesonotal scutum without such a stripe: antemiae entirely yellowish evasa 



23. Flagellar segments unicolorous 24 



I'lagellar segments bicolorous 31 



24. Antennae entirely yellow to brownisli yellow 25 



Antennal flagellum beyond base uniformly blackened 26 



25. Occiput shiny, with a large triangular spot that is a little darker ; antennal 



flagellum brownish yellow. . festina 



Occiput with a narrow dark brown line : antennae yellow temeraria 



2o. Occiput entirely polished but chiefly pale in color 27 



Occiput opaque, with polished triangular brand 28 



27. Posterior vertex and occiput unicolorous sodalis 



Posterior vertex and occiput with a narrow black median stripe. ..■ occipitalis 



28. A black spot at lateral end of transverse suture 29 



No such blackened area 30 



29. Abdominal tergites with row of dark spots ferruginea 



Abdominal tergites each with latero-posterior margins black. .. .beutenmuelleri 



W. Stigma brownish yellow occipitalis 



Stigma dark brown gracilicornis 



31. Flagellar segments at base dark brown or black 32 



Flagellar segments at base yellow 37 



'•i2. Occiput polished 33 



Occiput opaque, witli a polished triangle ^d 



