AGROMYZID LEAF MINERS — FRICK 353 



14, Costa reaching to the end of vein M1+2 15 



Costa reaching to the end of vein R4+5 16 



15, Calypter with fringe light brown; frons longer than wide . . . parvicornis 

 Calypter with fringe white; frons wider than long nigripes 



16, Anterior half of mesonotum with acrostichal setae in six rather regular 



rows 17 



Anterior half of mesonotum with acrostichals in four rather regular rows. 



subnigripes 



17, Gena in height midway between vibrissal and posterior angles about one- 



third the eye height (fig. 3) 18 



Gena in height midway between vibrissal and posterior angles about one- 

 seventh the eye height (fig. 6) barberi 



18, Third antennal segment dorsally flattened, distally with a sharp angle. 



niveipennis 

 Third antennal segment rounded (fig. 3) ambigua 



19, Calypter with margin and fringe brown 20 



Calypter with margin and fringe white or yellow 21 



20, Midtibia medially with two posterolateral setae isolata 



Midtibia medially without posterolateral setae spiraeae 



21, Tibiae and tarsi dark brown rntiliceps 



Tibiae and tarsi yellowish albitarsis 



Agromyza albitarsis IMiigsn 



Agromyza albitarsis Meigen, Systematische Beschreibung der bekannten euro- 

 paischen zweifliigeligen Insekten, vol. 6, p, 171, 1830. — Hendel, in Lindner, 

 Die Fliegen der palaearktischen Region, fam. 59, p. 100, 1931 (figure of 

 head). 



Agromyza cinerascens (Macquart), Melander, Journ. New York Ent, See, vol. 

 21, p. 253, 1913 (3 from Washington: 1 d^, 1 ? , Monroe; 1 ? , Port Gamble). 



This Holarctic species belongs with those species having four strong 

 dorsocentral setae, one being presiitural. The calypteral fringe is 

 white and the tibiae and tarsi are yellowish. The larvae make 

 blotch mines in the leaves of Populus spp. and Salix lasiandra Benth. 

 I have studied reared specimens from Washington, California, and 

 Pennsylvania. The species probably is widely distributed. 



Agromyza ambigua Fallen 



Agromyza ambigua Fallen, Diptera sueciae, vol, 2, No, 37 (Agromyzides) , p, 4, 

 1823. — Hendel, in Lindner, Die Fliegen der Palaearktischen Region, fam. 

 59, p. 103, 1931 (figure of head and wing). 



Agromyza kincaidi Malloch, Ann. Ent. Soc. Amer., vol. 6, p. 285, 1913 (figure of 

 wing), — Shewell, Canadian Ent,, vol, 85, p, 463, 1953. 



The holotype of A. kincaidi was compared with two specimens of 

 A. amhigua in my collection and with four in the U. S. National 

 Museum, all determined by E. M. Hering. This is a shining black 

 species with three developed dorsocentrals, the costa reaching to the 

 end of vein R.4+5, a relatively wide gena, and a rounded third antennal 

 segment (fig. 3). The larvae mine the leaves of some grasses. A 

 Holarctic species, A. amhigwi is at present known only from Alaska in 

 North America. 



