1913] Agromyza and Cerodontha. 271 



Synoptic Table of Species in Agromyza. 



1. Halteres white,, or pale yellow; (maculosa has a black spot on outer side). ..2 

 Halteres black or brown, never pale yellow 40 



2. Species with the disk of scutellum entirely or partly pale yellow 3 



Species with disk of scutellum colored as mesonotum, and never in part pale 



yellow 11 



3. At least the apical joint of antennas black. 4 



Antennas entirely yellow, or third joint only slightly infuscated ^ C 



4. Frons black, only the frontal lunule yellow 1. xanthophora Schiner. 



Frons yellow, only the ocellar triangle black, and sometimes the posterior 



part of orbits darkened 2. longispinosa, new species. 



-^. No short setulee on disk of mesonotum between the dorso-central bristles. .6 



6. Mesonotum with the disk broadly black, only the lateral margins broadly, 



and the anterior and posterior margins yellow 7 



Mesonotum with black, stripe-like marks, or disk black, the center of disk 

 in front of scutellum yellow, owing to the abbreviation of central stripe. .8 



7. Third antennal joint and palpi, at apices, infuscated. .2a. variala, new species. 

 Third antennal joint and palpi entirely yellow 7a 



7a. Mesonotum bare except for the dorso-central bristles. .3 JticaZw, new species. 



Mesonotum with discal setulae in addition to dorso-centrals 7b 



7b. Smaller species, 1-1.75 mm., last section of fifth vein 23^ to 3 times as long as 



the penultimate section 4 pusilla Meigen. 



Larger species, 2-2.5 mm., last section of fifth vein 13^ to 2 times as long as 

 penultimate section 5 scutellata Fallen. 



8. Only the margins of the discal marks on mesonotum black, the center por- 



tions reddish brown 8 melampyga var. marginalis, new variety. 



Markings on mesonotum unicolorous throughout 9 



9. Markings on mesonotum dull gray black, not glossy. ..6 horealis, new species. 

 Markings on mesonotum glossy black 10 



10. Cheeks, posteriorly, about one-half the eye height; arista almost bare. 



7 flavonigra Coquillett. 



Cheeks, posteriorly, much less than one-half the eye height; arista 



pubescent 8 melampyga Loew. 



11. Costa reaching to third vein or slightly beyond 12 



Costa reaching to fourth vein 17 



12. Frons lemon yellow; cross veins very close together 13 



Frons reddish or black, never pale yellow : 14 



13. Lateral margins of mesonotum broadly pale yellow; anterior two pairs of 



dorso-centrals on mesonotum much weaker than the posterior two pairs, 



the front pair not anterior to suture 9. brevicostalis new species. 



Lateral margins of mesonotum colored as disk; anterior two pairs of dorso- 

 centrals not much reduced in size, the front pair distinctly anterior to 

 suture 10 davisi Walton. 



14. Frons black; cross veins not close together 15 



Frons reddish; cross veins close together 16 



15. Pubescence on arista indistinct; occiput not projecting much on upper half. 



11 abbreviata new species. 

 Pubescence on arista distinct; occiput distinctly projecting on upper half. 



12 kincaidi new species. 



16. Slender, slightly shining, black species; mesonotum with four pairs of dorso- 



central bristles 13 parvicella Coquillett. 



Robust, glossy black species; mesonotum with two pairs of dorso-central 

 bristles 14 nitida, new species. 



17. Frons entirely yellow, or at least the center stripe mostly yellow or reddish, 



or the orbits yellow posteriorly 18 



Frons entirely black or brown, never yellow on any part; frontal lunule some- 

 times white dusted 27 



