274 THE CANADIAN ENTOMOLOGIST. 



4. Edge of wing base and spot on tegulae yellow zizi^e. 



Edge of wing base black ; tegulae black ; sometimes with a yellow 



dot 5- 



5. Metathorax more rugose, more pubescent ; enclosure less distinct, 



bordered by an impressed line, often obscured by the reticulations ; 

 face marks more yellow, less produced, more rounded on eye 

 margin ; wings more fuscous : flagellum darker ; rarely a dot on 



tegula lUinoiensis. 



Metathorax less rugose, less pubescent ; enclosure more distinct, 

 bordered by a raised line ; face marks paler yellow, more produced 

 and pointed on eye margin ; wings more hyaline ; tlagellum paler 

 beneath ; tegula often with a yellow dot ; sp. nov.: 36 



specimens bayi. 



Males. 

 Front coxa with a lateral tooth ; metathorax moderately rugose ; spot on 

 labrum, scape exteriorly, two lines on collar, and tubercles, yellow; face 



marks somewhat club-shaped on the sides ; 5 mm thaspii. 



Front coxa simple ; metathorax more rugose ; at least the face, tarsi, 

 anterior tibire in front, and middle and hind tibise at base, 

 yellowish ' • 



1. Base of abdomen red ; 6 mm nelumbonis. 



Base of abdomen black 2. 



2. Face mark broken into four parts by the irregular encroachment of 



black in the sutures ; elsewhere black, except on the legs ; scape 



broad, clavate ; 4-5 mm • • sanicute. 



Face mark entire ; tubercles coloured 3- 



3. Lateral extension of face mark usually club-shaped, always diverging 



from eye ] scape exteriorly and sometimes dot on tegulfe pale 



yellowish ; 4 mm pygmasa. 



Lateral extension of face mark ending near eye ; usually two lines on 

 collar ; 5-6 mm 4- 



4. Scape concave exteriorly; spot on tegulje, edge of wing base, labrum, 



mandibles more or less, often the scape exteriorly, yellow ; face 

 mark club-shaped laterally ; yellow at base and apex of middle tibi* 



connected ziziae. 



Scape ordinary ; tegulae, labrum and mandibles rarely with yellow ... 5. 



