SYSTEMATIC ACCOUNT. 69 



14. Bluish-black metallic stripes on front; costal index 1.5 or less; wings clear. 



verticis (p. 87) 



Costa and cross-veins clouded; costal index over 2.0 sororia (p. 87) 



Wings clear; costal index about 1.8 nana (p. 87) 



15. Mesonotum striped or spotted 16 



Mesonotum unmarked 29 



16. Front not widened above, largely velvety black; palpi dilated, black; face reced- 



ing; mesonotum dull brown, with two narrow stripes in front. . Mlineaia (p. 102) 

 Not as above 17 



17. Acrostichal hairs in six rows 18 



Acrostichal hairs in eight rowfe 23 



18. Veins clouded; posterior cross-vein sinuate; prescutellars present. 



(flexa, see above, under 4) 



Veins not distinctly clouded; posterior cross- vein straight 19 



19. First oral bristle more than twice the second 20 



First oral less than twice second 21 



20. Mesonotum gray, with dark spots; dull fasdola (p. 99) 



Mesonotum yellow and brown striped; sliining poeyi (p. 76) 



21. Fourth-vein index 2.5 or over; 1.5 mm. long saltans (p. 98) 



Fourth-vein index 2.0 or less; usually 2 mm. long 22 



22. 4c index 1.0 or less {earlei — see below, under 28) 



4c index over 1.0 pulchella (p. 88) 



23. Mesonotum yellow, with blackish stripes busckii (p. 77) 



Mesonotum blackish or brownish 24 



24. Mesonotum gray, with many small dark-brown spots 25 



Mesonotum striped or irregularly spotted 27 



25. Pteropleura pale yellow; spots between dorsocentral rows largely fused to form 



two irregular stripes ramsdeni (p. 102) 



Pteropleura brownish in part; numerous spots between dorsocentral rows 26 



26. First coxa dark brown below; dark abdominal bands with pale spots on lateral 



margins repleta (p. 99) 



First coxa pale below; pale lateral spots on abdominal segments present. 



mulleri (p. 101) 

 First coxa pale below; no lateral spots on dark abdominal bands hydei (p. 101) 



27. Cross-veins slightly clouded; carina subsulcate annularis (p. 99) 



Cross-veins not clouded 28 



28. One prominent oral bristle; carina sulcate coffeata (p. 98) 



Two large oral bristles; carina not sulcate earlei (p. 98) 



29. Acrostichal hairs in six rows 30 



Acrostichal hairs in eight rows 33 



30. First oral bristle over twice second; reddish brown; bristles and branches of 



arista short lutzii (p. 74) 



First oral bristle not over twice second; yellowish; bristles and branches of arista 



as usual 31 



31. Costal index less than 2.0; fourth-vein index more than 2.0 willisloni (p. 89) 



Costal index more than 2.5; fourth- vein index less than 2.0 32 



32. Shining; abdominal black bands broad cardini (p. 78) 



Dull; abdominal black bands narrow similis (p. 79) 



33. Veins distinctly clouded; only one bristle at distal costal break; a row of short, 



stout bristles on inner distal part of first femur immigrans (p. 83) 



Without any of above characters, except rarely a faint cloud on posterior cross- 

 vein 34 



34. Prescutellars present; costal index about 2.5; only one prominent oral bristle. . . 35 

 Prescutellars not differentiated 36 



35. Yellow species bromeiice (p. 72) 



Brown species; lives in flowers flor(E (p. 72) 



36. One prominent oral bristle; yellow throughout; bristles yellowish torrei (p. 86) 



Bristles black; black or brown, at least on abdomen 37 



37. Mesonotum yellow; costal index under 2.5; fourth-vein index over 2.0 38 



Mesonotum brown or black; costal index over 2.5; fourth-vein index under 2.0. . 39 



