102 DIPTERA. 



A female from Duefias, Guatemala (Champion), and two males and two females from 

 Orizaba, Mexico (coll. Bellardi) may be doubtfully referred to A. analis, Say; the 

 white hairs on the sides of the abdomen, near the base, mentioned both by Say and by 

 Wiedemann, do not however exist in my specimens. Three females from Dallas, Texas 

 (J. Boll), which I can compare, agree with the specimens from Orizaba, only the anal 

 cell in the latter is closed, while it is slightly open in the former. These specimens, 

 especially those with an open anal cell, agree quite well with Macquart's A. georgica, 

 if we assume that Macquart described not a male, as he stated, but a female. 



5. Argyramceba oedipus. 



Anthrax cedipus (Fabr.), Wiedem. Aussereur. zweifl. Ins. i. p. 262. 



Argyramceba cedipus, Schiner, Reise d. Novara, Zool. iii. Abth. i. p. 121 ; O. Sacken, Western Dipt. 



p. 243 ; Arribalzaga, El Naturalista Argentino, i. p. 273 ; Van der Wulp, Tijdschr. &c. xxv. 



p. 85, t. 9. f. 9 1 . 

 Anthrax irrorata, Say, Compl. Wr. ii. p. 61 ; Macq. Dipt. Exot. ii. 1, p. 60, t. 20. f. 6. 

 Anthrax cequa, Walk. las. Saund. p. 192. 

 Anthrax punctum, Walk. List &c. ii. p. 253. 



Hab. Nokth and South America, everywhere, from the British possessions in the 

 north to the Argentine Republic 1 . — Mexico, Northern Sonora (Morrison), Presidio 

 (Forrer) ; Guatemala, San Geronimo (Champion). 



6 Argyramceba pluto. 



Anthrax p 7 uto, Wiedem. Aussereur. zweifl. Ins. i. p. 261; 0. Sacken, Western Dipt. p. 244 1 ; Van 

 der Wulp, Tijdschr. &c. xxv. p. 85, t. 9. f. 10 2 . 

 Hab. Canada 1 and United States. — Mexico, Northern Sonora (Morrison). 



A single specimen from Northern Sonora before me agrees with my description (op. 

 cit.), only the front and the face below the antennae are covered with a slight brownish- 

 yellow pollen, which is not mentioned in it ; the frontal orbits are whitish. I reproduce 

 the description from the ' Western Diptera,' with a few slight emendations : — 



" The basal half of the wing is more or less like the darker-coloured specimens of 

 A. limatulus ; the hyaline portion has nine or ten small black spots — one at the extreme 

 end of the first vein in the shape of a small cloud, two on the concave end of the second 

 vein, two on the anterior branch of the third vein, the one at its origin being large ; a 

 spot, sometimes double, on the cross-vein at the base of the second posterior cell, often 

 coalescent with a small spot on the vein separating this cell from the third posterior ; 

 a spot on the curvature of the cross-vein at the base of the third posterior cell ; another at 

 the proximal end of that cell ; and one a little before the tip of the fifth vein. The large 

 spot on the cross-vein at the base of the fourth posterior cell is usually coalescent with 

 the black on the anterior half of the wing. A long stump of a vein on the geniculate 

 part of the second vein ; two stumps on the sinuosities of the anterior branch of the 



