56 FAUNA HAWAIIENSIS 



13. Femora black with only the bases and tips yellow :{i2) D. nigra. 



„ yellow 14. 



14. Antennae entirely, and front for the most part, light yellow (/j) D. flaviceps. 



,, and front more or less darkened 15. 



15. Pleurae yellow {14) D. iiifuscata. 



,, dark brown or blackish 16. 



1 6. Thorax and scutellum reddish-yellow (75) D. sordidapcx. 



,, ,, blackish-cinereous, the latter with yellow apex {16) D. haleakalae. 



17. Wings with second costal cell infuscated (77) D. setiger. 



,, ., clear 18. 



18. Wings with one or both the transverse veins clouded with fuscous 19. 



,, without any fuscous 22. 



19. The greater portion of the 2nd and the apices of the 3rd and 4th longi- 



tudinal veins bordered with pale fuscous (7c?) D. hunieralis. 



Longitudinal veins not bordered with fuscous 20. 



20. Last section of the 4th longitudinal vein twice as long as the penultimate 



{ig) D. pan<a. 



Two last sections of the 4th longitudinal vein equal in length 21. 



21. Thorax and scutellum reddish or brownish yellow, femora light yellow {20) D. ska?pi. 



Thorax, scutellum and fore femora blackish (21) D. olaae. 



22. Intermediate and hind tibiae with dark rings 23. 



Tibiae not annulated 24. 



23. Fore femora swollen {22) D. crassifeinora. 



„ not swollen {23) D. nasa/is. 



24. F"emora more or less dark 25. 



,, entirely light yellow 27. 



25. Arista extremely short-haired ; small species {24) D. mauiensis. 



,, long-haired ; larger species 26. 



26. Third joint of antenna light yellow (25) D. molokaiensis. 



,, ,, dark brown (2(5)Z>. sp.? 



27. Last two sections of the 4th longitudinal vein equal or subequal 28. 



Last section of the 4th longitudinal vein at least half as long again as the 



penultimate 31. 



' 28. Thorax shining black (27) D. tnelanosoma. 



,, more or less yellow 29. 



29. Thorax reddish-yellow with obscure blackish stripes ; pleurae partly 



blackish {28) D. longiseta. 



Thorax yellow, unstriped ; pleurae entirely yellow 30. 



30. Front reddish-yellow ; second joint of antennae entirely yellow (2p) D. xanthosoma. 



„ dark ferruginous ; „ ,, dark brown above, yellow 



below (30) D. cognata. 



31. Thorax entirely or in part reddish-yellow; pleurae reddish-yellow 32. 



,, and pleurae dark brown or blackish 37- 



32. Antennae entirely light or reddish-yellow 33. 



,, with the third joint dark 35. 



33. Scutellum dark brown (j7) D. inaeqiialis. 



„ yellow 34. 



34. Size 2h — 3 millimetres (J2) D. f/iotiiico/a. 



„ less than 2 millimetres {jj) D. pusilla. 



35. Abdomen light yellow without markings (33) D. pusilla, var. 



,, dark reddish brown 36. 



