AGROMYZID LEAF MINERS — FRICK 369 



8. Midtibia medially with one or two setae; head, viewed in profile, with geno- 



vertical plates not extending beyond eye margin (fig. 49) . . . curvibrissata 



Midtibia medially without setae; geno vertical plates extending beyond eye 



margin (fig. 47) congregate 



9. Vein M3+4 with ultimate section shorter than penultimate; crossvein r-m 



distinctly distad of junction of Ri in the costa 10 



Vein M3+4 with ultimate section subequal to the penultimate; r-m directly 



beneath the junction of Ri in the costa insularis 



10. Head, viewed in profile, with gena one-seventh to one-eighth the eye height; 



eye four-fifths as long as high maura 



Head viewed in profile, with gena one-fifth to one-sixth the eye height; eye 



two-thirds as long as high lantanae 



Ophiomyia buscki (Frost) 



Agromyza buskei Frost, Ann. Ent. Soc. Amer., vol. 29, p. 315, 1936. 



The proboscis is greatly elongate and the fasciculus at the blunt 

 vibrissal angle is very small (fig. 46). The gena is relatively narrow 

 and the calypteral fringe is white. The holotype male, the only known 

 specimen, was collected in the Panama Canal Zone. 



Ophiomyia congregata (Malloch) 



Agromyza congregata Malloch, Ann. Ent. Soc. Amer., vol. 6, p. 328, 1913. 



This species is somewhat intermediate between Melanagromyza 

 and Ophiomyia as stated by Shewell (1953). It is closer to Ophiomyia 

 in having a slight median carina widening below the antennal bases, 

 divergent antennae, and a definite, if sparse, fasciculus at the vibrissal 

 angle (fig. 47). This is a large species with a wing length of more than 

 2 mm. I have seen specimens from Ai-izona, Colorado, and North 

 Dakota. 



Ophiomyia coniceps (Malloch) 



Agromyza coniceps Malloch, Proc. U. S. Nat. Mus., vol. 49, p. 107, 1915 (figure 

 of head). 



The holotype is headless but Malloch illustrated the head and I 

 have included one from a male collected at Santa Cruz, Calif. This 

 species has an extremely elongate vibrissal angle (fig. 48). The larvae 

 mine the stems of Sonchus asper (L.). The species is widespread and 

 I have assigned specimens to it from Washington, California, Utah, 

 Louisiana, Indiana, Manitoba, and Quebec. 



Ophiomyia curvibrissata (Frost) 



Agromyza curvibrissata Frost, Ann. Ent. Soc. Amer., vol. 29, p. 309, 1936. 



The holotype male and a female on the same pin are in the U. S. 

 National Museum (No. 62974). The eye is subrectangular and rel- 

 atively long for its height (fig. 49). The vibrissal fasciculus is elon- 

 gate, being about one-half the eye height in length. The two type 

 specimens are from Guatemala. 



