STEPHUS. 



15 



strictest sense, from Brazil. In the present collections there are representatives of 

 nine species, some of them identical with those of the United States. It is of interest 

 to note that all the Central-American specimens of typical Syrphus are from a con- 

 siderable altitude. Both the species of the nearly allied genus Didea, hereinafter 

 mentioned, are likewise from the "tierra templada." 



Synopsis of the Central-American species. 



1. Three principal bands of the abdoinen entire americanus, Wiedem. ( ? ). 



Three principal bands of the abdomen interrupted ; eyes bare . 2. 



First cross-band interrupted, the others entire 4. 



2. Elongate species ; face in profile not prominent below., narrowed — 



below ; cheeks very narrow ; abdominal spots small, round. Sp. (no. 8). * ^U>^ 



Abdomen oval ; face prominent below 3. 



3. Face without black stripe eupeltatus, Bigot. 



Face with a black stripe Sp. (no. 4). (,,(4 



4. Eyes pilose; second and third abdominal bands bilaterally 



oblique, and all separated from the lateral margin . . . lotus, Willist. 

 Eyes bare 5 - 



5. Femora yellow at the base j abdomen elongate, narrow j second, 



third, and fourth segments each with a slender, triangular, 

 lateral, anterior spot and a complete band, the latter with its 



posterior margins bilaterally oblique decipiens, sp. n. 



Femora black or blackish at the base ; abdomen with three 

 simple bands 6 - 



6. The second and third abdominal bands not quite reaching the 



margin americanus, Wiedem. ( <J ) . 



The second and third abdominal bands reaching quite to the 



. 7. 



margin 



7. Bands straight, not emarginate behind, attaining the lateral 



margins in their full width ; abdomen with subparallel sides . diversus, sp. n. 

 Bands more or less sinuous or emarginatej or attenuated before 

 reaching the lateral margins 8. 



8. Third joint of antennie rounded ribesii, Linn. 



Third antennal joint elongate, straight on the upper border, 



and obtusely pointed ; hind metatarsi yellow bisinuatus, sp. n. 



l. Syrphus americanus. 



Syrphus americanus, Wiedem. Aussereur. zweifl. Ins. ii. p. 129 1 ; Osten Sacken, Proc. Bost. Soc. 

 Nat. Hist. xviii. 145 2 ; Willist. Synopsis N.-Am. Syrphidse, p. 82 3 . 

 Hab. Noeth Ameeica 1 , British Possessions 2 3 , Montana 3 , New England 2 3 , New 

 York 2 , Delaware 2 , Virginia 2 , Michigan 2 , Texas Muxico, Omilteme in Guerrero 

 8000 feet (H. H. Smith). 



