480 Annals Entomological Society of America [Vol. VI, 



142. Antennas long, reach base of third abdominal segment {&)', front and 



occiput with median black line 143 



Antennas of male do not reach beyond the base of the abdomen; front 

 and occiput without median black line 144 



143. Joints of fiagellum of male very slightly constricted in the middle, three 



mesonotal vittas, margined with black; abdomen with black stripe 

 each side. A yellow stripe extends from below the humerus to base 

 of wing and scutellum; margins «of median thoracic vittas widely 

 diverging anteriorly; margin and lower side of scutellum yellowish; 

 hypopygium large; eighth sternite with black hair; posterior margin 

 of ninth tergite with a pair of conical, blunt processes. Wings pale 

 gray, the ante-stgimal spot not connected with the discal spot; a spot 



beyond the stigma. Length 14-18 mm strigata Coq 



Joints 4-7 of male fiagellum, strongly constricted in the middle; lateral 

 vittas of mesothorax obsolete, the median stripe gray, bordered with 

 black; Abdomen sparsely clothed with short, pale yellow hair, 

 yellow with median black vitta; hypopygium rather small, eighth 

 sternite with sparse, short yellowish hair; ninth tergite without apical 

 processes. White spots of wing indistinct. Length 11-13 (o 71 ) to 

 15-19 ( 9 ) 'mm : cineracea Coq 



144. Thorax with many short white hairs on its dorsum; wing spots rather 



distinct. Abdomen black, thinly covered with sh6rt, pale yellowish 

 hair; base of ventral surface at least, and sometimes the hind margin 

 of some of the segments, yellow; ventral surface of eighth sternite with 

 pale yellow hair; hypopygium and wing-spots similar to strigata. 



Length 12-15 mm tenebrasa Coq 



Thorax without white hairs, wing spots indistinct. Mesonotal vittas 

 black. Abdomen black, hind margins of segments, except the first, 

 and lateral margins yellow, sparsely covered with very short, yel- 

 lowish hair; hypopygium small; hind margin of ninth tergite desti- 

 tute of processes. Length 14 mm. (d") gelida Coq 



145. Fuscous species 146 



Colored otherwise 149 



146. Abdomen striped 147 



Abdomen without longitudinal stripes, posterior margin of abdominal 



segments paler* 148 



147. Posterior margin of abdominal segments not paler, the three longitu- 



dinal stripes black. Mesonotum with six brown lines, the median 

 stripes broad, laterals narrow. Eighth sternite with two deep folds or 

 depressions; posterior margin of ninth tergite with two very small 

 points; ninth sternite with median, whitish line, lateral angles with 

 long, slender processes; wings hyaline, one or two indistinct, 

 whitish peristigmal spots and a similar spot in the discal cell. Length 



12 mm. (o 71 ) stalactoides fDoane 



Posterior margin of abdominal segments paler, dorsal stripe paler. 

 Antennas wholly brown; mesonotum gray, three very broad fuscous 

 vittas; lateral margin of abdominal segments paler; hypopygium 

 small, ninth tergite with median, short rectangular process, the lat- 

 eral angles of which are produced into sharp, black points; ninth 

 sternite deeply and narrowly incised; wings with brownish tinge, 

 middle portion somewhat whitish-hyaline; ante-stigmal spot indis- 

 tinct. Length 14 mm. (o 71 ) diluta Doane 



*Posterior margin of abdominal segments very indistinctly paler in dejecta 

 Fab. 



fAppears closely allied to cineracea, Coq. 



