NORTH AMERICAN DIPTERA. 73 ■ 



PROCTACAISTHDS. 



1. — Segments of the abdomen pilose on the sides; very large species; femora red. 



heros. 



Abdomen nearly bare throughout 2. 



2. — Abdomen except the base, red, lightly pollinose; femora red rut'iis. 



The ground-color of abdomen chiefly black ; conspicuously pollinose 3. 



3. — Abdomen nearly uniformly dark brownish pollinose. ...pliilailelphicus. 



Abdomen not uniformly dark brownish pollinose 4. 



4. — Abdomen thickly nearly white pollinose, large species (30-35 mm.). 



Milbertii. 

 Abdominal segments distinctly brownish above, smaller species (20-22 mm.). 



breTipennis. 



Addittonal species from the United States. 



P. fulviventris Macquart, Dipt. Exot. 4e. Suppl. 88, 12. — Fla. 



(The length evidently should be 14 lines instead of 4.) 

 P. longus Wiedemann, Dipt. Exot. i, 183, 1; Auss. Zw. Ins. i, 426, 3 (Asilus); 



Macquart, Dipt. Exot. i, 2, 123, 6 : Schiner, Verb. Zool. Bot. Ver. 1866, 682.— 



Georgia. 

 P. micans Schiner, Verb. Zool. Bot. Ver. 1867, 397. 

 P. nigriventris Macquart, Dipt. Exot. i, 2, 124, 9.— Penna., Carolina (= P. brevi- 



pennis ?) 

 P. virginianus v. d. Wulp, Tijdschr. voorfentom. xxv, 109. — Va. 



Proctacaiitlius brevipeiinis. 



Asilux brevipennis Wiedemann, Auss. Zw. Ins. i, 431, 10 ; v. d. Wulp, Tij chr. 

 voor Entom. xxv, 108. 



-^ , 5 . — Length 20-23 mm. Face and front thickly covered with yellowish 

 white dust. Mystax sparse, white, composed chiefly of bristles. Antennse Jack. 

 Beard white, not very abundant, occipital-orbital bristles black. Thorax blackish 

 brown when rubbed, with portions of the dorsum and pleurae showing mjre or 

 less red. Dorsum brownish yellowish dusted, showing two median rather broad 

 blackish brownish stripes, indistinctly separated by a linear brown pollinose stripe. 

 Pleurae thickly yellowish gray pollinose. Abdomen black, in well-preserved 

 specimens wholly covered with rather dense gray pollen, in, the middle broadly 

 brownish, but in most specimens the abdomen is evenly and rather thinly polli- 

 nose, with only a trace of the brownish pollen above. Hypopygium red. Legs 

 red, the femora on their outer sides broadly black. Wings hyaline, the veins nar- 

 rowly clouded with yellowish. 



Hab.—Ga., Fla., Ky. 



Six specimens (Morrison). Is similar in coloration to P. Milbertii, 

 but the pollen of the abdomen has a much more distinct brownish col- 

 oration, the confluent or narrowly separated median thoracic stripes are 

 broader and much more conspicuous. There is also a great diff"erence in 

 size. 



TEANS. AMER. ENT. SOC. XII. .(14) JANUARY, 1885. 



