W. G. DIETZ 135 



SYNOPTICAL TABLE OF THE NORTH AMERICAN SPE- 

 CIES OF ORMOSIA RONDANI (RHYPHOLOPHUS 

 KOLENATI), WITH DESCRIPTIONS OF NEW 

 SPECIES (DIPTERA) 



BY WILLIAM G. DIETZ, M. D. 



1. Discal cell closed 2 



' Discal cell not closed (Dasyptera Schiner) 13 



2. Wings variegated or bicolored 3 



Wings unicolorous 7 



3. Wing-veins 6 and 7 diverging to the wing margin 4 



Wing-veins 6 and 7 parallel or converging to the wing margin 6 



4. Wings spotted brown in all the cells innocens Osten Sacken 



Wings not spotted as in alternative 5 



5. Basal portion of wing between veins 1 and 5, and apical part of wing fus- 



cous apicalis Alexander 



Three fuscous costal spots and transverse veins margined with fuscous. 



atriceps sp. n. 



6. Three more or less distinct, grayish brown transverse bands in apical part 



of wing nubilus Osten Sacken 



An indistinct band extends from stigma along the central cross vein. 



fascipennis Zetterstedt 



7. Seventh vein arcuated, axillary cell in the middle as wide as, or wider than 



at the wing margin 8 



Seventh vein diverging from vein 6 to wing margin 9 



8. Antennae entirely brown arcuata Doane 



Antennae yellow at base f umata Doane 



9. Antennae entirely brown; thorax shining. Great cross vein at middle of 



discal cell abnormis sp. n. 



Antennae not entirely brown - 10 



10. Entire thorax and coxae yellowish-red; antennae pale yellowish, infus- 



cate towards the tip luteola sp. n. 



Thorax not as in the alternative 11 



11. Mesonotum reddish with median fuscous line. . . pilosa sp. n. 



Thorax fuscous 12 



12. Four basal joints of antennae pale yellow. . . . nigripila Osten Sacken 

 Two basal joints of antennae yellow fusiformis Doane 



13. Discal cell coalescing with the second posterior cell 14 



Discal cell coalescing with the third posterior cell 17 



14. Seventh vein arcuated; axillary cell at middle as wide as or wider than at 



the wing margin holotricha Osten Sacken 



Veins 6 and 7 diverging towards the wing margin 15 



TRANS. AM. ENT. SOC, XLII. 



