AGROAIYZID LEAF MINERS FRICK 395 



of the subgenus Praspedomyza. Phytobia hilarella, a very similar 

 species, was placed into Praspedomyza by Hendel because of larval 

 characters. Phytobia clara is retained here for the same reason 

 although the demarcation between the frontal vitta and the geno- 

 vertical plates is not as clearly defined as it is in most species of the 

 subgenus Praspedomyza. I have illustrated the head (fig. 93) to 

 show the contrast between Phytobia clara and P. hilarella, the latter 

 figured by Hendel (1931). The larvae form mines in the fronds of 

 Pteridium aquilinum (L.) Kuhn. I have seen specimens from Cali- 

 fornia, Washington, Michigan, Tennessee, and Maine in the United 

 States and from Ontario, Canada. 



Phytobia {Praspedomyza) morio (Brischke) 



Agromyza morio Brischke, Schrift. Naturf. Ges. Danzig, vol. 5, p. 258, 1881. 

 Dizygomyza (Praspedomyza) morio (Brischke), Hendel, in Lindner, Die Fliegen 

 der palaearktischen Region, fam. 59, p. 8C, 1931 (figures of head and wing). 



This is a small black species that has the third antennal segment 

 and the forefemur distally yellow. Malloch had a Maryland specimen 

 in the U. S. National Museum labeled "A. luteicornis Malloch MS." 

 I have reared the species from Galium trifidum L. and G. aparine L. in 

 California. No other North American specimens are known. 



Phytobia (Praspedomyza) subinfumata (Malloch) 



Agromyza infumuta Malloch, (not Czerny and Strobl, 1909), Canadian Ent., vol. 



47, p. 15, 1915. 

 Agromyza subinfumata Malloch, Proc. U. S. Nat. Mus., vol. 49, p. 108, 1915. 



This species is dark brown and lacks the yellow third antennal 

 segment and distally yellow forefemur of Phytobia morio. The head 

 has the genovertical plates extending beyond the eye margin and 

 bearing three or four lower-orbital setae (fig. 94) . Known only from 

 Illinois. 



6. Genus Cerodontha Rondani 



Cerodontha Rondani, Dipt. Ital. Prodr., vol. 4, p. 10, 1861. 



This is a relatively small genus that is characterized by having 

 only the distal pair of scutellar setae present (fig. 95). The third 

 antennal segment is always angulate distally. Two widely divergent 

 subgenera have been recognized. One, the subgenus Xenophytomyza, 

 could be very properly placed as a synonym of Phytobia (Praspedo- 

 myza) except for the two scutellar setae and the Cerodontha (Cero- 

 dontha) type of male terminaUa. 



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