194 CHAELES ROBERTSON. 



2. Wings clouded at apex ; middle metatarsus broader than tibia, broader than 



hind one; process bidentate; abdomen pubescent, opake, with large, 



close, shallow punctures rudbeckise. 



Wings hyaline; middle metatarsus hardly broader than hind one; legs, espe- 

 cially the tarsi and hind tibiaj, inclining to yellowish ferruginous ; pro- 

 cess triangular, truncate or emarginate, abdomen almost impunetate. 



heliantbi. 



3. Clypeus yellow ; stigma dark ; pubescence thin, pale; abdomen finely rugose, 



opake aliciee . 



Clypeus black 4. 



4. Middle metatarsus not broader than hind one; process emarginate ; abdomen 



smooth, shining, sparsely punctate 6. 



Middle metatarsus broader than hind one; process strongly bidentate; abdo- 

 men finely rugose, opake, impunetate, or nearly so 5. 



5. Fovea extending a little below antenna ; length 11 mm asteris. 



Fovea not extending below antenna; length 9 mm solidag-inis. 



6. Joint 3 = 4-6, 4-10 broader than long ; fovea not reaching antenna ; mesonotum 



opake krigiana. 



Joint 3 = 4+ 5, 6-10 not broader than long; fovea extending a little below 

 antenna ; mesonotum a little shining lauracea. 



MALES. 



Process entire or slightly emarginate or bidentate ; joint 3 longer than 4-|- 5. .4. 

 Process strongly cleft, strongly bidentate 1. 



1. Stigma large; angles of ventral segment 6 reflexed ; joint 3 = 4 + 5; abdomen 



finely rugose, impunetate or nearly, segments with whitish fascife ■ -3. 



Stigma small, narrow ; joint 3 longer than 4 + 5 ; abdomen distinctly punctate ; 



clypeus and a spot on each side of face yellowish 2. 



2. Abdomen opake, quite pubescent ; wings clouded, nervures dark ; face marks 



whitish rudbeckiee. 



Abdomen shining, thinly pubescent; wings hyaline, nervures pale; margins 

 of segments broadly pale testaceous; face marks yellow . .pulchella. 



3. Clypeus and a spot on each side of face yellowish, length 9-10 mm . • .asteris 

 Clypeus whitish, length 7 mm solidaginis 



4. Stigma small ; wings whitish, nervures pale; clypeus yellow ; tibife and tarsi 



more or less testaceous helianthi 



Stigma large 5 



5. Antenna long, middle joints as long as wide ; cheek broad ; stigma dark ; cly 



pens yellow ; abdomen opake, finely rugose alicias 



Antenna short, middle joints shoi'ter than wide; cheek narrow; stigma pale ; 

 clypeus with trilobed yellowish spot; abdomen smooth and shining. 



krigiana. 



