478 Annals Entomological Society of America [Vol. VI, 



Mesonotum cinereous, with three median brown lines and two lateral, 

 broader brown stripes; ante-stigmal spot very faint. Emargination 

 of eight sternite very slight, rounded; emargination of ninth tergite 

 very deep, V-shaped, latero-posterior angles sharp-pointed; lower 

 angle of pleural plates produced into a short, blunt point. Length 

 12-15 mm biuncus Doane 



129. Posterior margin of abdominal segments paler 130 



Posterior margin of abdominal segments not paler 137* 



130. With whitish spot beyond the stigma 131 



Without such a spot 133 



131. Ante-stigmal spot extends through discal, fourth and fifth posterior cells 



to the posterior margin of the wing. Mesonotum cinereous with five 

 brown stripes; three abdominal stripes, lateral one broader, base of 

 first segment whitish; eight sternite produced, slightly emarginate 

 at the apex; ninth tergite small with broad, V-shaped emargination 

 bordered posteriorly by a yellowish, less coriaceous margin; ninth 

 sternite deeply divided, lateral margin angulated in such a way, that 

 the emargination is widest at the base and narrowed about the middle. 



Length 12-14 mm usitata Doane 



Ante-stigmal spot does not reach the posterior margin; thorax trivittate. 132 



132. Mesonotum light brown; abdomen with three longitudinal, brown 



stripes. Posterior margin of eight sternite broadly emarginate, the » 

 posterior margin with a fringe of thick, long, yellow hair; ninth tergite 

 with narrow, median incision; posterior margin of ninth sternite 

 whitish with deep median incision, on each side of which are two 

 small appendages. Ante-stigmal spot indistinct, extends into the 

 base of the fourth posterior cell, discal cell four times as long as wide. 



Length 13-14 mm barbata Doane 



Thorax gray; abdomen without longitudinal stripes. Scutellum dark 

 yellow; eighth sternite simple, not emarginate; hypopygium small, 

 somewhat compressed laterally, ninth tergite small with V-shaped 

 emargination; ninth sternite widely and very deeply divided and 

 from the base of the emargination arises a median, digitiform, hairy 

 process, directed horizontally backwards. Wings yellowish hyaline, 

 veins brown, the ante-stigmal spot is inconspicuous and extends into 



the base of the fourth posterior cell. Length 10-14 mm 



aropesoides Johnson 



133. Eighth sternite deeply divided; abdomen with three stripes 133 



Eighth sternite not emarginate 135 



134. The lateral margins of the eight tergite end in long, slender processes; 



a broad blunt process arises from the base of the emargination. Meso- 

 notum with four brown stripes; abdominal stripes indistinct; ninth 

 tergite terminates in two short, median blunt processes; ninth sternite 

 with deep U-shaped incision. The ante-stigmal spot distinct, inter- 

 rupted at the praefurca, extends into the base of the fourth posterior 



cell. Length 15 mm calcarata Doane 



Lateral margins of eighth sternite do not end in long processes; from the 

 emargination arise two tufts of hair; ninth sternite deeply incised 135 



135. Mesonotum with four distinct stripes; ninth tergite with broad, shallow 



emargination. Abdominal stripes indistinct anteriorly, lateral 

 margins of segments gray. Ante-stigmal spot extends into the base 



of the fourth posterior cell. Length 15-21 mm aequalis Doane 



Mesonotum with three brown stripes; ninth tergite with broad, deep 

 V-shaped incision. Abdominal stripes more distinct; ninth sternite 

 with broad, deep depression; pleural suture very short. Ante-stig- 

 mal spot indistinct, extends into the base of the fourth posterior cell. 

 Length 9 mm. (cf) alta Doane 



*Except fulvinodus, see under 140. 



