AGROMYZID LEAF MINERS — FRICK 365 



A small species (1.5 to 2 mm. in wing length) without unusual 

 features on the head (fig. 33), M. minima is characterized by the 

 extremely loDg ovipositor (two to three times the length of the sixth 

 tergite), dark brown calypteral fringe, and a metallic green sheen. 

 I have seen specimens from Trinidad, Puerto Rico, Virgin Islands, 

 Panama Canal Zone, and Guatemala. Larval host plants remain 

 unknown. 



Melanagromyza orbitalis (Frost) 



Agromyza orbitalis Frost, Ann. Ent. Soc. Amer., vol. 29, p. 314, 1936. 



The holotype male from Barro Colorado Island, Panama Canal 

 Zone, is in the American Museum of Natural History. It is the only 

 specimen of this species. The head has several of the setae broken 

 (fig. 34). There is a medial seta on the foretibia but M. orbitalis has 

 the calypteral fringe black and lacks the metallic sheen found in 

 M. caerulea. 



Melanagromyza riparella (Hendel) 



Agromyza riparia Malloch (not van der Wulp, 1871), Proc. U. S. Nat. Mus., 



vol. 49, p. 105, 1915 (figures of head and wing). 

 Agromyza riparella Hendel, Konowia, vol. 2, p. 145, 1923. 



This species belongs to the group with all orbital setulae reclinate, 

 white calypteral fringe, and body without metallic sheen. It is 

 characterized by having tln-ee lower-orbital setae, a relatively wide 

 gena (fig. 35), and vein M3+4 with the two sections subequal in length. 

 I have seen 30 specimens, all from lUinois. 



Melanagromyza salicis (Malloch) 



Agromyza salicis Malloch, Ann. Ent. Soc. Amer., vol. 6, p. 314, 1913 (figure of 

 wing). 



The holotype is now wingless but Malloch's figure shows the vena- 

 tion. M. salicis is unusual in having very prominent genovertical 

 plates (fig. 36) and thi^ee strong dorsocentral setae. The larvae form 

 galls on the twigs of willow {Salix spp.). At present the species is 

 known from Illinois, Ohio, New York, and Massachusetts. 



Melanagromyza schineri (Giraud) 



Agromyza schineri Giraud, Verh. Zool.-Bot. Ges. Wien, vol. 11, p. 484, 1861. 

 Melanagromyza schineri (Giraud), Hendel, in Lindner, Die Fliegen der palaeark- 

 tischen Region, fam. 59, p. 174, 1931 (figures of head and wing). 



This species has prominent genovertical plates and a relatively small 

 gena that slopes posteroventraUy from the eye margin, while the gena 

 of M. tiliae is buccate (fig. 41). Crossvein m-m is about its own length 

 from r-m while it is only about two-thu-ds of its length from r-m in 

 M. tiliae. The larvae form gaUs on the twigs of Populus spp. Salix 



