NO. 1906. arxopsi^ OF yEOTROPiCAL LiM\oniyji:—.iLEXAyDER. 527 



-•\j1tc1ma3: first segment broadly oval-cylindricol; second sliort, 

 oval-cylindrical, much narrower than the first; third segment 

 elongate-cylindrical, not constricted, with long delicate hairs; seg- 

 ments 4 to the end, constricted at tJie ends, and constricted once or 

 twice medially, producing a bi-nodose or tri-nodosc !i])i)carance. As 

 previously staled, some (as nivcitars^is) have simple flagellar segments; 

 at the nodes, the segments are clothed with long outstretched hairs 

 which are much longer than the segments which bear them; inter- 

 spei-sed with these are very short, prominent bristles, and over the 

 whole segment is a fine dehcate pubescence. 



Palpi: fu-st segment very sliort, second and third subequal in 

 diameter and lengtli; fourtli about as long as 2 and 3 together, 

 narrower than either. 



Venation: Sc, at, or near, the tip of Sc,; R long, R, usually far 

 back from its tip; M, and M3 usually separate at the wing-margm; 

 M3 and Cui fused for a considerable distance, when separatuig, the 

 fork symmetrical; cross veui m absent. 



Genitalia: male (ohscurd); pleurte very long, cylindrical, tliickly 

 clothed on the external facies with long hairs; two apical appendages; 

 anal tube broad, distinct; guard of the penis scarcely visible from the 

 exterior. 



KEY TO THE SI'ECIKS OF POLYMERA. 



1. Cell M, entirely absent 2. 



Cell M , present 3. 



2. Large species (wing 6.2-6.8 mm.); Cuj-I-Mj shorter than M3 alone; pleurse dark; 



tarsi white pleuralis, new species (Brazil). 



Small species (wing 3-3.5 mm.); Cui+Mj longer than M3 alone; pleura; not dark; 

 tarsi not white conjuncta, new species (Brazil). 



3. Wings not uniform in coloration 4. 



Wings uniform in coloration 6. 



4 . Wings dark colored with lighter spots or fasciae 5. 



Wings hyaline, or nearly so, with small brown spots at the forks of most of the 



veins obscura Macquart (Brazil). 



5. Wings with white or whitish spots superba, new species (Costa Rica, Brazil). 



Wings with a light yellow cross-band hirticomis Fabricius (Brazil). 



6. Flagellar segments of the antennae elongate-cylindrical, not noticeably con- 



stricted 7. 



Flagellar segments of the antennae constricted once or twice, giving a multi-seg- 

 mented appearance to the antennae 8. 



7. Tarsi of all the legs white fusca Wiedemann ' (Brazil). 



Only tarsi of hind legs white niveitarm, new species (Guat., Brazil). 



8 . Fore and m iddlo tarsi more or less yellowish- white or white 9. 



Fore and middle tarsi dark, about concolorous with the tibiae 11. 



9. Antennae conspicuously annulated, rather short (about as long as the body). 



georgix Alexander ^ (Southeast U. S.). 

 AntennK not conspicuously annulated, much longer than the body 10. 



> Auss. Zweifl. Ins., vol. 1, pp. 5S and M4, pi. 6t), figs. 3-4. Original description In Dipt. Exot., 

 vol. 1, p. 44. 

 • Psyche (Dec, 1911), pp. 199, 200, fig. 5. 



