108 PROCEEDINGS OF THE ACADEMY OP 



Metathorax with only a central black stripe : 



Posterior femora entirely black 54. abaculus. 



Posterior femora black at tips and on upper edge. . 60. jugiosus. 



Posterior femora entirely yellow oo. abitus. 



Metathorax yellow, with only a black dot on basal middle, most of 



abdomen yellow, with narrow black bands 50. durus. 



Metathorax with arcuate blackish line at base, extending down on 



each side, and an elongate spot at apex 63. monitus. 



Metathorax with two black basal spots : 



Antennae % entirely black above 50. chichimecus. 



Antennae % with yellowish anuulus 01. limitaris. 



Metathorax with two oblique black lines, dilated above ; antennas' 



short, very slender toward tips 62. tenuicornis. 



Metathorax with three large black spots above, posterior spot the 



larger; abdomen polished ; posterior tibia? black. 46. epicus. 



IMetathorax with three black spots above, the two basal ones 



largest ; abdomen opaque 39. excuratus. 



Metathorax with a central, apical, and tAvo confluent black spots ; 



hind tibiae Avith exterior edge black 38. zaptlauus. 



Metathorax black above, divided by narrow yellow lines into several 

 elongate spots ; hind femora and tibiae black at tips. 



57. Alvarado. 

 Metathorax with two short lines at base ; abdomen long, slender, 

 cylindrical, posterior legs honey -yellow, tarsi yellow. 



51. teres. 

 Mesothorax with a short white line on each side over the tegulrc : 



Scutellum black, with lateral margin white 20. encaiistus. 



Scutellum entirely white 22. Parredes. 



Mesotliorax entirely black : metathorax black witli a large yellow 



discal mark 44. ignarus. 



Metathorax with prominent lateral tubercles or spines : 



Mesothorax with white discal spot 68. picturatus. 



Mesothorax with discal lines abbreviated : 



Posterior tibia? entirely black, their tarsi white, with most of basal 



joint black 32. Arista. 



Posterior tibifle yellow, apex black, their tarsi yellow. 



24. subsplnoBus. 

 Posterior tibifc entirely fulvous : 

 Basal segment of abdomen Avithapex white ; metathorax black 

 at base and down middle to apex, three small white spots on 



basal margin 25. actuosus. 



Basal segment of abdomen with apex white ; metathorax above 

 with two longitudinal black lines from base to spines, and a 



central apical black line 33. maritus. 



Basal segment of abdomen with apex yellow, second segment 

 with two oblique black stripes confluent at base ; metathorax 

 with two large black spots near base 48. abjectus 



