388 PROCEEDINGS OF THE NATIONAL MUSEUM vol. io8 



The revision did not include species found south of the United 

 States because of the poor condition of the type series of P. (C.) 

 ipomoeae and P. (C.) cassiae. Complete descriptions are impossible 

 and these species are placed in the key by using rather minor 

 characters. Short descriptions are included for the three Neotropical 

 species not included in the revision. The notes under the other 

 species are limited to larval host plant records and distributions be- 

 cause the revision included descriptions of all species considered 

 therein. 



Key to the described species of Phytobia (Calycomyza) 



1. Calypter with margin and fringe white or yellow 2 



Calypter with margin and fringe dark brown or black 6 



2. Third anteunal segment rounded, subcircular; anterior half of mesonotum 



with about six rows of acrostichal setae 3 



Third antennal segment with an anterodorsal angle, flattened dorsally 

 beyond base of arista; about five rows of acrostichals 5 



3. Genovertical plates dark from vertex to at least the dorsal upper-orbital 



seta; forefemur entirely black 4 



Genovertical plates dark not more than halfw^ay between inner vertical 

 seta and dorsal upper-orbital; forefemur distally narrowly yellow. 



lantanae 



4. Second dorsocentral seta more than one-half the length of the third dor- 



socentral; genovertical plates dark from vertex to at least halfway be- 

 tween the two upper-orbital setae promissa 



Second dorsocentral one-half or less the length of the third; genovertical 

 plates dark usually to dorsal upper-orbital, sometimes beyond, rarely to 

 ventral upper-orbital jucunda 



5. Mesofacial plate dark except for narrow yellow- epistomal margin; calypter 



with margin and fringe white humeralis 



Mesofacial plate yellow; margin and fringe yellow . solidaginis 



6. Mesofacial plate at least one-half dark 7 



Mesofacial plate yellow, not more than antennal bases dark 10 



7. Genovertical plates dark from vertex to at least ventral upper-orbital . . 8 

 Genovertical plates dark from vertex to dorsal upper-orbital . artemisiae 



8. Genovertical plates dark, at least narrowly, from vertex to the ventral lower- 



orbital; second dorsocentral more than one-half the length of the third 



dorsocentral 9 



Genovertical plates dark to ventral upper-orbital or dorsal lower-orbital; 

 second dorsocentral less than one-half the third cynoglossi 



9. Mesonotum shining, six rows of acrostichals; humeral seta on black . majuscula 

 Mesonotum dull, poUinose, four or five rows of acrostichals; humeral seta 



on yellow gigantea 



10. Genovertical plates yellow, rarely dark from vertex to halfway to dorsal 



upper-orbital; third antennal segment ovoid, longer than wide .... 11 



Genovertical plates dark at least to dorsal upper-orbital; third antennal 



segment subcircular 12 



11. Inner postalar seta on yellow of mesonotum flavixiotum 



Inner postalar on black of mesonotum allecta 



