dexiim;. 357 



44. With discal and marginal macrochaetae (20) . . Thelaira. 

 Without discal macrochaetae. .... Polygaster. 



45. Abdomen yellow, with or without black markings. . . 46 

 Abdomen black, sometimes partly whitish or cinerous. . 47 



46. Apical cell broadly open Xanthodexia. 



Apical cell narrowly open (8, 9). ... Calodexia. 



47. Curvature of fourth vein arcuate. . . Rhombothyria. 

 Curvature of fourth vein angular. 48 



48. Arista short-hairy. Pseudomorinia. 



Arista distinctly plumose. ....... 49 



49. Eyes bare (18) Morinia. 



Eyes hairy Comyops. 



The following genera are not included in the foregoing table: Echi- 

 nodexia, Eudexia, Paraprosena, Dexiosoma, Pseudodexia, Cyrto- 

 soma, Theresia, Homodexia. 



NOTES ON THE FIGURES. 



BY PROF. C. H. T. TOWNSEND. 



Figs. 3,4. I propose for this species the new genus Euc/uziogyne. 

 I identify the species with specimens from the Sierra Madre of western 

 Chihuahua. 



5. In the genotype the apical cell probably ends at the wing tip. 



8, 9. The figures agree with a specimen of Calodexia in U. S. Nat. 

 Mus. but the posterior cross-vein is nearer the bend of the fourth vein. 



10, 11. Both figures agree with specimens of Chnoneura, female, 

 and the wing with Ptilodexia also, but not the head. 



12, 13. The figure of the head is typical of Myiocera, except that 

 there is a pair of strong reclinate vertical bristles in female. 



14, 15. Rhamphinina, sp. male. The figures agree with speci- 

 mens which I refer to Rhamphinina, differentiated from Rhyncho- 

 dexia by the absence of facial carina. 



19. Rhynchodexia, sp. male. Appears to be this genus, distin- 

 guished from Euchcztogyne by the absence of strong reclinate vertical 

 bristles. 



20. Thelaira, sp. male: Quite typical, but the species is probably 

 not T. longicornis, which Brauer refers to Pseudodexia. 



21. Euantha liturata male. A costal spine is present. The wing 

 of the female is more deeply clouded. 



22. Melanophora roralis. The petiole of apical cell originates 

 usually a little before point opposite to end of second vein. 



33 



