AGROMYZID LEAF MINERS — FRICK 359 



Agromyza viridula Coqpiiilett 



Agromyza viridula Coquillett, Journ. New York Ent. Soc, vol. 10, p. 190, 1902. — 

 Malloch, Ann. Ent. Soc. Amer., vol. 6, p. 313, 1913. 



As far as I know, this is the only species found in the United States 

 with a greenish sheen to the mesonotum, scutelluin, and abdomen. 

 The mesonotum is subshining and bears two developed dorsocentrals 

 and one small dorsocentral. The head is shaped as in the illustration 

 (fig. 20). The larvae form blotch mines in the leaves of red oak 

 (Quercus sp.). Agromyza guercus Sasakawa, 1954, is very closely 

 related and the larvae mine the leaves of Quercus glauca Thunb. in 

 Japan. The Japanese species differs in having a dark brown margin 

 and fringe to the calypter. I have seen specimens from Georgia in 

 the south to Massachusetts in the north. The specimens reared from 

 red oak were from Indiana. Probably widespread over the eastern 

 half of the United States. The Puerto Rican specimens doubtfully 

 referred to this species by Malloch are all in very poor condition. 

 I can find no references to red oaks occurring in the West Indies so 

 these specimens are no doubt of another species. 



2. Genus Melanagromysa Hendel 



Melanagromyza Hendel, Arch. Naturg., Abt. a., vol. 84, p. 126, 1920. 

 Limnoagromyza Malloch, Bull. Brooklyn Ent. Soc, vol. 15, p. 147, 1920. 



In North America this genus contains 25 described species. The 

 halteres are black but there is no carina between the antennae as 

 occurs in Ophiomyia (fig. 45) and Tylomyza spp., even though the 

 antennae may be widely separated. The orbital setulae are either 

 inclined in several directions or are all reclinate as in the genera 

 Agromyza and Ophiomyia. 



There are several unusual features not found in the Palaearctic 

 fauna. The first is the reddish lunule and ventral half of the frontal 

 vitta of Melanagromyza diadema. The frons is black in all other 

 species. M. dianthereae has the only sexual dimorphism in the family 

 of which I am aware. The third segment of the male antenna is 

 much more setulose (fig. 27) than that of the female (fig. 28). None 

 of the North American species has elongate mouthparts as do two 

 in Europe that belong to what could be called the longilingua group. 



If one were to continue the designation of species groups as Hendel 

 (1931) did for the genus Agromyza, two Melanagromyza species groups 

 not represented in Europe are known here. The first, the burgessi 

 group (couplet 3), has nearly all orbital setulae erect to reclinate 

 except for a few anterior ones (fig. 24). M. virens is the sole repre- 

 sentative of its group (couplet 4). The orbital setulae are very ir- 

 regular and are inclined in three directions (fig. 42) . The aeneiventris 



