514 H. Loew. 



1. collaris Wied. 

 2. Pleurae altogether yellow. 



2. nohilis Lw. 



h. Venter without whitish reflection. 



1. Occiput without black spot. 



3. virescens Lw. 



2. Occiput with a black spot. 



4. vitiula Lw. 



B. Scutellum and metathorax with a stripe. 

 a. Wings with a brownish tinge. 



5. lugetis Lw. 

 &. Wings hyaline. 



1. Anterior end of the lateral thoracic stripes curved. 



6. iticurvn Lw. 



2. Anterior end of the lateral thoracic stripes straight. 



7. peduiictilata Lw. 



IL Thoracic stripes brownish or reddish; sometimes obsolete. 

 ..4. Thoracic dorsum opaque. 

 a. Stigma dark brown. 



8. unimac^ilata Lw. 



h. Stigma yellowish. 



1. Antennae longer than usual. 



9. macrocera Say. 



2. Antennae shorter than usual. 



10. tenuis Lw. 



B. Thoracic dorsum shining. 



a. A velvet black spot ad the anterior end of the lateral thoracic stripes. 



11. punctum. Lw. 



h. No velvet black spot at the anterior end ol the lateral thoracic stripes. 

 1. Joints of the flagellum (with the exception of the basal ones) blackish, 

 a. Occiput altogether shining. 

 * Crossveins clouded. 



