68 THE NORTH AMERICAN SPECIES OF DROSOPHILA. 



22. 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 pale spots on dark abdominal bands. . .hydei (p. 101) 



23. Costal index about 1.0; fourth-vein index about 5.5; pleura? with a dark stripe 



above quadrala (p. 76) 



Costal index 2.0 or over; fourth-vein index less than 3.0; no pleural stripe 24 



24. Blackish species, not at all reddish or yellowish 25 



Yellow, or reddish brown 26 



25. Costal ihdex about 4.0; 2.5 mm. long; no combs on tarsi robusta (p. 96) 



Costal index about 2.7; 2 mm. long; a comb of short, stout bristles on each of the 



two basal tarsal joints of the first legs of the male obscura (p. 93) 



26. Costal index less than 3.0; fourth-vein index about 2.3; the male has a comb of 



short, stout bristles on the basal tarsal joint of the first leg 27 



Costal index over 3.5; fourth-vein index less than 1.5; no tarsal combs 28 



27. Genital arch of the male ■with a hook-like posterior process (fig. 13); cheeks 



relatively narrow (fig. 45) melanogaster (p. 89) 



Genital arch of the male with a clam-shell-like posterior process (fig. 14) ; cheeks 



broader (fig. 46) simvXans (p. 91) 



28. Dull j^ellow, not at all reddish; a row of very short, stout bristles on lower apical 



part of front femur; wings shghtly clouded on posterior cross- vein and tips of 



second and third veins immigrans (p. 83) 



Reddish brown; no combs on femora; wings clear, or occasionally slightly clouded 



on posterior cross- vein funebris (p. 84) 



Neotropical Species of Drosophila. 



1. Wings distinctly spotted or clouded other than narrowly along the veins 2 



Wings clear, or clouded along veins, or spotted along veins but not on blade 7 



2. About ten acrostichal rows; a single pair of dorsocentrals superba (p. 104) 



Slx acrostichal rows; two pairs of dorsocentrals 3 



3. Prescutellar bristles distinct; bristles brown 4 



PrescuteUars not differentiated 5 



4. Costal index over 3.0; posterior cross-vein sinuate flexa (p. 71) 



Costal index under 3.0 paradoxa (p. 72) 



5. Two large oral bristles; wings entirely smoky; fourth- vein index 2.0 or oVer. 



nebulosa (p. 88) 

 First oral over twice second; wings spotted; fourth- vein index under 2.0 6 



6. A spot at tip of wing vittalifrons (p. 103) 



Wings spotted also on basal portion calloptera (p. 103) 



See also calloptera ornatipennis (p. 104) 



7. Mesonotum velvety black; four acrostichal rows opaca (p. 104) 



Mesonot^m not velvety black 8 



8. Face white; six acrostichal rows; carina large; mesonotum yellowish 9 



Face not white 10 



9. Front j-ellow; abdomen banded albirostris (p. 78) 



Front brown; abdomen black metzii (p. 78) 



10. Carina absent, or small and confined to upper part of face 11 



Carina present below 15 



11. Mesonotum j-ellow in front and on sides, shading into metallic bluish black in 



middle behind metallica (p. 73) 



Mesonotum more or less definite^ striped 12 



Mesonotum unmarked, shining black 13 



Mesonotum unmarked, yellow or brown 14 



12. One prominent oral bristle; third antennal joint long, yellow, hairy. . .pro^«a//!a (p. 75) 

 Two prominent oral bristles; third antennal joint as "usual. 



(pulchella — see below, under 22) 



13. Scutellum shining black diibia (p. 73) 



Scutellum velvety black splendida (p. 73) 



See also splendida luteipes (p. 74) 



