16 BIBIONID.VE. 



tlioracicus Say, J. Acarl. Phil. Ill, 80, 3; Wiedemann, Auss. Zw. I, 

 77, 5. — Pennsylvania, Maryland. 

 *tn)ialis Loew, Centur. IX, 61. — Sitka. 



maculatus Bellardi, Saggio etc. I, 19 5 tab. I, f. 5. — Mexico. 



uiiniitHS Bellardi, Saggio etc. App.. 7. - Mexico. 



styg-ius Say, J. Acad. Phil. VI, 155 ; Corapl. Wr. II, 352. — Mexico. 



Observation. Mr. Walker's species. 



fiilviooxa Walker, List, etc. I, 117. — Huds. B. Terr, 

 serraticollis Walker, List, etc. 1, c. — Huds. B. Terr. 



Ilcspcriuns. 



Walker, List, etc. I, 81, 1848; Spodius Loew, Berl. Ent. Z. II, ICl; 

 Tab. T, f. 1-15; 1858. l^-). 

 * brevifrous Walker, List, etc. I, 81. — British Possessions; White 

 Mts., N. H. and Colorado Mts., in the alpine region. 



Plccia. 



Wiedemann, Auss. Zw. I, 72; 1828. (>*). 



rnficollis Fabricius, Wiedemann, Auss. Zw. I, 72 ; Macquart, Hist. Nat. 



Dipt, Atlas, Tab. IV f. 17-, Bellardi, Saggio etc, I, 15. — South 



America; Mexico; Florida. (Lake Harney, by Messrs. Hubbard 



and Schwarz.) 

 *heteroi)tera Say, J.Acad. Phil. Ill, 77, 2; Compl. Wr. II, 69 (Bihio) ; 



Wiedemann, Auss. Zw. I, 80, 6 (id.) — Atlantic States. 

 Penthetria atra Macquart, Hist. Nat. Dipt. I, 175, 2. Compare also 



Van der Wulp, Tijdschr. etc. 2(i Ser. IV, 81. 

 Eupeitenus ater Macquart, Dipt. Exot. I, 1, 85; Tab. XII, f. 3. — 



Philadelphia. 

 Plecia longipcs Loew, Berl. Ent. Z. II, 109. — New Orleans. 



bicolor Bellardi, Saggio etc. I, 16. ^- Mexico. 



heros Say, J Acad. Phil. VI, 154 (Penthetria); Compl. Wr. H, 352 



(id.) — Mexico. 

 iiigferrima Bellardi, Saggio etc. I, 14. — Mexico. 

 rostrata Bellardi, Saggio etc. I, 15. — Mexico. 

 riifitliorax Walker, List, etc. I, 116. — Jamaica. 

 Yittata Bellardi, Saggio etc. App. 7, f. 4. — Mexico. 



Observation. Plccia himacuJata Walker, Dipt. Saund. 422, 

 United States, is the female of one of the common North- American 

 Diloplms. 



Scatopsc. 



Geoffroy, Hist. Nat. d. Ins. II, 545; 1764. (»^). 



*atrata Say, Long's Exp. App. 3G7; Compl Wr. I, 250; Wiedemann, 

 Auss. Zw. I, 71, 1. — Philadelphia. 

 Scatopse recurva Loew, Linn. Entom. I, 330, Tab. HI, f. 4. — 

 Europe. (Loew. Sillim. Journ. :N. Sei^ Vol. XXXVII, 317.) 



