6 PROCEEDINGS OP THE NATIONAL MUSEUM vol.78 



5. First abdominal segment pale at sides where the lateral bristles arise 6. 



First abdominal segment dark at sides where the lateral bristles arise 13. 



6. Abdomen yellow with faint brown bands on hind margins of the segments 



(New England to Texas) biannulata Say. 



Abdomen much darker 7. 



7. Third antennal joint on outer side fully three times the second ; lateral 



bristles of first and second abdominal segments wholly pale (British 



Guiana) fasciata, new species. 



Third antennal joint not over twice the second ; lateral bristles of first and 

 second abdominal segments mostly black 8. 



8. Abdomen unusually short and broad, second segment shortened in middle of 



dorsum ; third paler in color with a narrow transverse dark band in mid- 

 dle, approaching the hind margin at sides (British Guiana). 



breviventris, new species. 

 Abdomen of usual form, not as described 9. 



9. Front except narrow lateral margins of uniform reddish-brown color; ocel- 



lar triangle very short, rounded off close to median ocellus ; mesonotum 

 with ill-defined median wide brown stripe (Panama). 



currani, new species. 

 Front and mesonotum not as described 10. 



10. First posterior cell not wider than submarginal, last section of fourth vein 



nearly straight; proboscis yellow halfway to geniculation 11. 



First posterior cell wider than submarginal, last segment of fourth vein 

 strongly bowed ; proboscis yellow only at base 12. 



11. Hind edge of last sternite with a complete transverse comb-like row of back- 



wardly directed black spinules, and just before this a pair of small groups 

 of black setules, less conspicuous ; outer forceps svvolen, white, with a long, 

 slender yellow apical process extending across the median line (Central 



America) pectinata, new species. 



With no apparent spinules on last sternit? ; the outer forceps slender, with 

 jagged tips, without such processes (Central America). 



rectinervis, new species. 



12. Front coxae with brush of long pale hair at tip ( Brazil )__sty lata Fabricius. 

 Front coxae with black hair at tip (Mexico, Central and South America). 



stylosa Townsend. 



13. Last sternite with a small cluster of black setules on each side of the median 



rounded notch (Mexico, Central America) minuta Townsend. 



Last sternite not with clusters of setules 14. 



14. Middle third of hind femur and penultimate fifth of hind tibia whitish, well 



defined (Panama) banksi, new species. 



Hind femora and tibiae almost unicolorous, brownish (Honduras). 



apicalis, new species. 



Females 



1. Ocellar triangle long, almost or quite reaching lunule 2. 



Ocellar triangle much shorter, rarely extending a little beyond middle of 



front 5. 



2. Ocellar triangle opaque ; third antennal joint four or more times the second 



on outer side (eastern United States) neglecta Williston. 



Ocellar triangle shining 3. 



3. Lateral bristles of first abdominal segment wholly pale 4. 



Lateral bristles of first abdominal segment mostly black (Peru). 



peruviana, new species. 



