ART. 28 CHALCID FLIES NORTH OF MEXICO BALDUF 9 



10. Length 2.5 mm., slender, bright golden yellow, ocelli and occiput 



narrowly, and most of dorsum of abdomen, black or brown- 

 black, thorax immaculate, submarginal band feebly formed, 

 sometimes fading out at apex, then about one-half longer 



than broad amsterdamensis (p. 20). 



Length 2 to 2.8 mm., more robust than above, thorax marked 

 black, submarginal bands more distinct 11. 



11. Disk of scutel more or less black lanae (p. 19). 



At least ocellar area and occiput narrowly, and prescutum be- 

 neath pronotum, and on some specimens scutel in part, black. 



nubilistigma (p. 26). 



12. Head from above transversely rectangulate-ovate in outline, and 



almost or quite twice as wide as long, front not prominently 

 rounded, posterior half of sides of abdomen coriaceous in both 

 sexes, body black except anterior-lateral corners of jironotuni 



yellow-brown occidentalis (p. 58). 



Head from three-fifths to two-thirds as long as wide, front as 

 seen from above prominent, broadly rounded, abdomen not 

 .sculptured, or not continuously coriaceous on posterior half 

 of sides 13. 



13. I-ength 1.8 to 2.2 mm., 10 to 13 setae on submarginal vein, sides 



of abdomen unsculptured and polished, submarginal band 

 highly variable in length but not in width, and never entirely 



lacking in specimens at hand nigriceps (p. 62). 



Length 2.6 to 2.9 mm., usually about 15 setae on submarginal 

 vein, sides of abdomen usually granulose, at least in female, 

 submarginal band uniformly twice as wide as long globuli (p. 47). 



14. Submarginal band of various shapes, but wider at its widest 



point than length of stigma or marginal vein, never approach- 

 ing twice as wide as long, usually but one-fifth or so longer 

 than wide, sometimes abbreviated, then quadi*angular in 



shape 15. 



Submarginal band narrow, not broader than stigma or margi- 

 nal vein, usually twice as long as wide and then usually 

 its apical portion curving toward base of wing, band rarely 

 reduced in length and often with a heellike prominence on 

 outer margin near stigmal vein 19. 



15. Head seen from above twice as wide as long, or slightly more 



robust, face not prominently rounded between eyes or on 



forehead 18. 



Head about four-sevenths to two-thirds as long as wide, face 



quite prominently rounded as seen from above varians (p. 33). 



16. Length 3 mm., color mostly black, at most only laterals of pro- 



notum yellow, most of its dorsum black. 



occidentalis var. flavifrons (p. 61). 

 Length 3.3 mm. or more, body less black, and more yellow or 

 mixed yellow 17. 



