CERIA. 



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Synopsis of the recognized Central-American species. 



1. Antenniferous process slender, as long as the first joint of tlie 



antennae 2 



Antenniferous process distinctly shorter than the first joint of the 



antennae ^ ^ 



2. Wings dark brownish-black, with a subhyaline space at the outer 



posterior part nigripennis, Willist. 



Wings hyalme, with the anterior part brown or brownish ... 3. 



3. Very large red species, with yellow markings superba, Willist. 



Moderately large, black and yellow species, the yellow pre- 



dominating verralli, sp. n. 



4. Antenniferous process altnost wholly wanting; first joint of the 



antennse nearly as long as the following two joints together . signifera, Loew. 

 Antenniferous process at least one-fourth of the length of the first 



joint of the antennse 5. 



5. Second abdominal segment as broad as long (^), the fourth seg- 



ment shorter than the third ; black, less slender species . . meadei, sp. n. 



Second. abdominal segment more or less cylindrical 6. 



6. Thorax wholly black bergrothi, sp. n. 



Thorax more or less yellow 7. 



7. Sides of the metanotum with a conspicuous yellow spot ... 8. 

 Metauotum wholly black 9. 



8. A large trapezoidal yellow spot in front of the scutellum . . . scutellata, Willist. 

 Two small, oblique spots in front of the scutellum schnablei, sp. n. 



9. Fourth abdominal segment markedly Jonger than the third . . nigra, Bigot. 

 Fourth abdominal segment a little shorter than the third . . . pedicellata, Willist. 



1. Ceria nigripennis. 



Ceria nigripennis, Willist. Synopsis N.- Am. Syrphidse, p. 263 \ 

 Hab. Mexico 1 . 



2. Ceria superba. 



Ceria superba, Willist. Synopsis N.-Am. Syrphidae, p. 264 \ 

 Hab. Mexico 1 . 



3. Ceria verralli, sp. n., <$ . 



Face light sulphur-yellow, a stripe on the cheeks, and a narrow one on the facial tubercle, extended as a 

 light greenish or brownish stripe to the antennse, black ; on either side, above, a small brown spot within 

 a larger, oblique, light greenish one. Vertical and frontal triangles coloured like the face ; at the base of 

 the antennae, a black spot extending out towards the orbit. Antenniferous process brownish-red ; slender, 

 longer than the first joint of the antennse. First joint of the antennae reddish-brown, slightly longer 

 than the second ; second and third joints yellowish-red ; third joint a little shorter than the second. 

 Thorax yellow, like the face ; mesonotum with three opaque black stripes, the median one dividing 

 Y-like behind the suture to blend with the posterior end of the lateral stripes; in front of the scuteUum 



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