1!)21 I Van D>r.pc — A Feir Nnrfli A nieriran DoJichopodida' 125 



Hypopygium rathei- slender, tapering towards its apex, 

 more conical than oval (Xev.) nigripes sp. nov. 



4. Venter and part of the dorsmn of the a'.idoraen yellow 5 



Abdomen without yellow, except sometimes on the venter. . G 



5. Whole of sixth abdominal segment and base of the hypo- 



pygiimi yellow (W, I.) cupuUferous Aid. 



First abdominal segment and more or less of the base of 

 the hypopygium yellow (Ind., Mo., X. C, Ga., D. C, 

 N". Y.) ahdominalis Say 



6. Hypopygium ovipositor-like, 1)ent under the abdomen 



(W. I.) singularis Aid. 



Hypopygium normal 7 



7. Fourth vein bent backward to meet the cross- vein, forming 



a distinct angle at this point (W. I.) minor Aid. 



Fourth vein only gently bent at the cross-vein 8 



8. Anteniiffi yellow, or yellowish 9 



Antennae black 10 



9. Capsule of hypopygium truncate at tip (Fla.) . . . .vietus V. D. 

 Capsule pointed at tip (N. Y., Md.) . . .muhlenhergice J. & C. 



10. Hypopyginal lamella^ sessil, rounded at tip (N". Y.) 



teciiis V. D. 

 Lamellse somewhat petiolate 11 



11. Lamellae nearly round in outline (Wis., N. Eng., Mo., 



N. Y., 111., Wyo., Ont.) willistonii Wh. 



Lamellae decidedly longer than wide 12 



12. Thorax with violet reflections and with a golden spot on 



the posterior slope before the scutellum (Ga.) 



aur'motatus Y. D, 

 Thorax green or purple with the posterior slope green. . . .13 



13. Thoracic dorsum purple: hypopygium rather pointed, its 



lamellfB pointed at tip (]\Iex.) pumJlus Aid. 



Dorsum of thorax green ; hypopygium rounded at apex, its 

 lamellas rounded at tip (K". Y., Ont.) coiiiosus Y. D. 



Thrypticus nigripes sp. nov. 



Male : Length 1.75 mm. Face, front, thorax and abdomen dark 



shining blue-green. Face very narrow lielow. Antenna^ and mouth 



parts black. Bristles of the thorax and the conspicuous hairs on 



the abdomen yellow. Hypopygium blue-green, its hairs yellow; 



