110 NORTH AMERICAN TIPULIDAE 



26. Wing-surface smooth, without hairs. 



a. flagellar joints bicolored; wings yellowish macrocera Loew 



aa. flagellar joints unicolorous, dark brown, wings dusky. 



macrocera atrocera var. nov. 

 Wings hairy pUosula spec. n. 



27. Inner apical appendages of hypopygium large, conspicuous (see pi. V, 



fig. 23) 28 



Not as in the alternative (see pi. VI, fig. 27a) 30 



28. Costal cells yellow; flagellar joints fuscous, yellow at base 29 



Costal cells brownish; flagellar joints, except those of the base, entirely 



fuscous okef enoke Alexander'* 



29. Inner apical appendages of hypopygium stouter, twisted, ending spine- 



like urocera spec. n. 



These appendages slender, serpentine cornifera spec. n. 



30. The rodlike appendages of the guard of the penis small, inconspicuous 



(pi. VI, fig. 27b) tenuis Loew 



These appendages large, protuberant, strongly geniculate (pi. VII, fig. 28). 



tenuis hamata subspec. n. 



31. Thorax with five, light pruinose stripes pruinosa Johnson'' 



Not more than three thoracic stripes, the latter sometimes obsolete 32 



32. The anterior part of the lateral thoracic stripes curved outward and end- 



ing in an opaque or velvety black spot 33 



Not as in the alternative 39 



33. Occiput opaque, without spot or line punctum Loew 



Not as in the alternative 34 



34. Flagellar joints bicolorous 35 



Flagellar joints unicolorous 36 



35. Occiput with dark median line calinota spec. n. 



Occiput with shining, triangular spot wulpiana Bergroth 



36. Mesonotal scutum with velvety black median stripe . . opacivittata spec. n. 

 Without such a stripe 37 



37. Median stripe of scutellum and postnotum and large post-alar spot 



blackish montana spec. n. 



Not as in the alternative 38 



38. Antennae entirely yellowish; sides of pronotal scutum and spot in pleuro- 



dorsal suture fuscous evasa spec. n. 



Antennal flagellum dark fuscous; pleuro-dorsal suture without spots. 



nesdlis spec. n. 



39. Flagellar joints unicolorous 40 



Flagellar joints bicolorous 51 



40. Antennae entirely yellowish 41 



Flagellum, except basal joints, blackish 42 



41. Occiput unicolorous festina spec. n. 



Head with dark occipital line temeraria spec. n. 



'* Washington University Studies, 1915, p. 97. 



" Bulletin American Museum of Natural History, xxxii, p. 42. 



