AGROMYZID LEAF MINERS FRICK 419 



This is a subshining black species tliat has the tarsi dark brown or 

 black. The mesonotum is only slightly gray pollinose and bears an 

 intraalar seta but lacks the inner postalar. The head is very similar 

 to that of Pseudonapomyza lacteipennis (fig. 136). The larvae mine 

 the leaves of many grasses in Europe and I have reared it from Agro- 

 pyron repens (L.) and Secale cereale L. in Washington. 



Pseudonapomyza lacteipennis (Malloch) 



Phylomyza lacieipennis Malloch, Proc. U. S. Nat. Mus., vol. 46, p. 152, 1913. 

 Phyiomyza acidicornis (Loew), Melander, Journ. New York Ent. Soc, vol. 21, 

 p. 269, 1913. 



This species is unusual in having the basal four tarsal segments 

 yellowish. The mesonotum is dull black and heavily bluish pollinose 

 and lacks an intraalar but bears the inner postalar seta. The head 

 (fig. 136) is typical for a species of this genus in having the thmi 

 antennal segment angulate, only one upper-orbital seta, and three or 

 four lower-orbitals. No larval host plants are known but they are 

 probably grasses. I have seen specimens from Washington, New 

 Mexico, Kansas, North Dakota, and Michigan. This species is 

 apparently common and widespread in North America. 



14. Genus Napomysa Westwood 



Napomyza Westwood, An introduction to the modern classification of insects, 

 vol. 2, p. 152, 1840. 



Napomyza is a small genus separated from Phyiomyza by the pres- 

 ence of crossvein m-m. Like Phyiomyza, the orbital setulae are 

 proclinate (fig. 137). There are about 20 Palaearctic species, one of 

 which is found in North America. There are three in the Nearctic 

 region, with A^. lateralis being Holarctic in distribution. None is 

 known from the Neotropical region. Napomyza anomala of Melander 

 is deleted because Melander's specimen is incorrectly identified. 



Key to the described species of Napomyza 



1. Acrostichal setae in two irregular rows 2 



Acrostical setae in four or five irregular rows davisii 



2. Wing with vein M1+2 ending at wing tip; maxillary palpus not broadened 



distally lateralis 



Wing with tip between H4+5 and M1+2; maxillary palpus expanded distally 

 to about one-half the diameter of the third antennal segment (fig. 138). 



parvicellu 

 Napomysa iiavisii (Walton) 



Agromyza davisii Walton, Ent. News, vol. 23, p. 403, 1912. — Malloch, Ann. Ent. 

 Soc. Amer., vol. 6, p. 284, 1913 (figure of wing). 



This is a valid species and may be separated from the other two 

 Napomyza species by having four oi' five rows of acrostichal setae and 



