BUFFALO SOCIETY OF NATURAL SCIENCES 163 



Specimens of this genus are not numerous in any collec- 

 tion, they are usually taken one at a time and many of the species 

 are described from a single specimen. 



I am indebted to Prof. J. M. Aldrich for the loan of his 

 material, which contained many new species ; to Prof. C. W. 

 Johnson, Mr. Xathan Banks, Prof. J. S. Hine, and Mr. H. S. 

 Harbeck for the loan of their material ; to Dr. J. C. Bradley for 

 the loan of the material in the Cornell University collection, and 

 to Mr. E. T. Cresson, Jr., for the loan of the material of the 

 American Entomological Society. 



Table of Species. 



1. Dorsum of the abdomen more or less yellow at base. 2. 

 Abdomen without yellow on the dorsum. 7. 



2. Fore and middle femora entirely yellow. 4. 

 Fore and middle femora partly black. 3. 



3. All femora black with the extreme tips yellow. 



1, lainellatus Loew. 

 Fore and middle femora with the basal half black. 



2, basalis n.sp: 



4. Cilia of the tegulae black, second and third segments of the 



abdomen yellow, antennae black. 3, dimidiatus Aid. 



Cilia of the tegulae pale, at least in certain lights. 5. 



•"). Antennae black. 6, ventralis, n.sp. 



Amtennae yellowish brown, or with the first joint yellow. G. 

 (J. Front and thorax with violet reflections, antennae yellow- 

 ish brown. 5, satrapa Wh. 

 Front and thorax green, covered with yellowish pollen, first 

 antennal joint yellow. 4, antennatus, n.sp. 

 ~i. Femora green, black or brown, the tips may be yellow. 8. 

 Femora yellow. 36. 



8. Eyes of the male contiguous. 9. 

 Eyes not contiguous. 13. 



9. Color of the dorsum of the thorax opaque black or brown. 



10. 

 Color of dorsum more or less green. 12. 



10. Halters and tegulae yellow. 7, contiguous Aid. 



Halters and tegulae black. 11. 



