472 Annals Entomological Society of America [ Vol. VI, 



84. Larger, 20-28 mm; costal border broader and more deeply fuscous; the 



median vitta begins about the middle of the second- basal cell, basal 

 half of anal and axillary cells whitish hyaline. Hypopygium small, 

 exposed part of ninth tergite short, posterior margin with a median 

 broader and two lateral, clawlike processes, ninth sternite divided to 

 near its base by a narrow suture, posterior margin sub-triangularly 

 emarginate, the lateral angles end in a scroll-like protuberance, 



pleural suture present. Length 19-25^ mm caloptera Loew 



Smaller, 19-20 mm. Costal border less intensely fuscous, the median 

 vitta begins near the base of the second basal cell; anal and axillary 

 cells grayish fuscous, slightly paler at the base. Hypopygium small, 

 ninth tergite produced posteriorly into a large, lobelike process, 

 almost as long as the exposed part of the body of the segment, ninth 

 sternite deeply divided to near its base; pleural suture present. 

 Length 14-20 mm strepens Loew 



85. The white spot before the stigma extends across the wing in form of an 



irregular fascia and nearly reaches the posterior margin; part of costal 



border posterior to subcostal cell, paler. Length 13 mm. ( 9 ) 



i fraterna Loew 

 The white spot does not extend beyond the base of the fourth posterior 

 cell 86* 



86. Abdomen without fuscous stripes; hypopygium small, ninth tergite pro- 



duced posteriorly into a large, lobe-like process, at each side of the 

 posterior margin arises a pencil of long, stiff bristles, ninth sternite 

 deeply and rather widely divided to near its base; pleural suture 



present. Length 12-20 mm tricolor Fahr 



Abdomen with fuscous, lateral stripes. Length 15% mm. (d 71 ) 



vitrea V. d.Wulp 



87. All the veins with a more or less distinct brown border. Gray, thoracic 



vittse bordered with fuscous; abdomen fuscous; eight sternite dis- 

 tended by a tumid appendage on the ventral side of the ninth sternite, 

 the latter with deep V-shaped incision and median suture; pleural 

 plates present; posterior margin of ninth tergite with two close-set, 

 black tipped projections. Wings almost hyaline with an indistinct 



whitish stripe in the first basal cell. Length 11 mm meridiana Doane 



Not all the veins bordered with fuscous 88 



88. Posterior cross vein and apical part of fifth longitudinal vein narrowly 



• bordered with fuscous 89 



Posterior cross vein and apical part of fifth vein not so marked 94 



89. Thoracic stripes margined with fuscous. Brown; joints of flagellum 



unicolorous, dark brown; abdomen with lateral fuscous stripes, hypo- 

 pygium rather large, black, no pleural suture or pleural plates, pos- 

 terior margin of ninth tergite with two slender processes. Ninth 

 sternite with deep, broad incision and median yellow line. Wings 

 almost hyaline, the indistinct whitish band in front of the stigma, 



extends to base of fourth posterior cell. Length 17 mm. (cf ) 



albocaudata fDoane 

 Thoracic stripes not margined 90 



90. Color yellow 91 



Color fuscous 92 



*No mention of "a white spot before the stigma" is made by the author of 

 T. vitrea. 



fSpecimens in my collection determined by Prof. Doane and agreeing with his 

 description, show a well marked, strongly curved pleural suture. 



