ART. 17. NORTH AMERICAN PHOROCERA ALDR.ICH AND WEBBER. 11 



T.VBLE OF SPECIES OF ZENILLIA. 



1. Abdomen bearing true discal macrochaetae ir> 



Abdomen destitute of true discal macrochaetae 2 



2. Palpi yellow , 5 



Palpi black 3 



3. Tliorax bearing three dorsocentral and three sternopleural macro- 



chaetae; mid tibiae with one bristle on the outside near the middle 



(if with two or more see No. 8) coquilletti, new species. 



Thorax bearing four dorsocentral macrochaetae 4 



4. With four sternopleural bristles; anal segment of the abdomen shhiing 



]y\ixc]^ confinis Fallen. 



With three sternopleural bristles ; anal segment of the abdomen gray 

 or yellowish pollinose futilis Osten Sacken. 



5. Mid tibiae with two or more stout bristles on the outer front side near 



the middle- 



Mid tibiae with but one stout bristle on the outer front side near the 



middle- 



11 



6 



6. Third vein with but a few bristles at its base 7 



Third vein bristly to the small cross vein; abdomen black, shiny, the 



base of intermediate segments gray pollinose setinervis Coquillett. 



7. Abdomen black and shiny; basal fourth of segments two and three 



thinly gray pollinose at most polita Coquillett. 



Abdomen black or brown, gray pollinose 8 



S. Bucca one-eighth or more eyeheight 1" 



Bucca not over one-twelfth eyeheight ; the two uppermost frontal bristles 



reclinate (if with three reclinate frontal bristles see No. 22) 9 



9. Marginal macrochaetae of the abdomen not distinctly separated fi-om 

 the erect hairs of the dorsum ; third antennal joint of the male two 

 and one-half times the second; first to fourth abdominal segments 

 with yellow ground color on sides. Avhich is not covered by the thin 



ppjjgjj protuberans, new species. 



Marginal macrochaetae of the abdomen distinct from the erect hairs of 

 the dorsum ; third antennal joint of the male at least three times the 

 second ; if the sides of the abdomen are yellow it is largely concealed 

 by the dense pollen amplexa Coquillett. 



10. The anterior stout reclinate bristle of the front is only one-third from 



the inner vertical to the antennal insertion. Male without orbitals. 



ceratomiae Coquillett. 

 Palpi in male densely clothed with long black hairs ; male with orbitals. 

 both sexes with a stout reclinate bristle halfway between antoimal in- 

 sertion and inner vertical; front and face light golden pollinose; 

 thorax and abdomen thinly gray pollinose (Euwasiccra coccidrUa 

 Townsend) Sturmia sternalis Coquillett.' 



11. With three sternopleural bristles ^- 



With four sternopleural bristles; facial ridges bristly about one-half 



lobeliae Coquillett. 



way 



12 Second antennal joint less than one-half as long as the third \i 



Second antennal joint about one-half as long as the third ; abdommal 

 hairs erect on the intermediate segments coerulea, new species. 



« The male was described as tie female by Coquillett (Revis., 1897 p. 109) ; Town- 

 send described the female (Annals Ent. Soc. Amer., vol. 2. 1909. p. 2-19) ; the synonymy 

 wTs indicated by Thompson (Psyche, vol. 17. 1910. p. 211). Some of the specimens have 

 the eyes somewhat hairy, so we insert it In the table to avoid mistakes. 



