AGROMYZID LEAF MINERS — FRICK 387 



broadly yellow for about one-third the length. From P. (7.) poUinosa 

 it differs by having the third antennal segment brown or black and 

 the eye bare. The wing is typical of those found in this subgenus in 

 being relatively long and narrow (fig. 86). I have reared P. (I.) 

 longipennis from leaf and stem mines in Juncus xiphioides Meyer in 

 California. This is the first positive record of a host plant for species 

 of the subgenus Icteromyza. I have seen specimens from many 

 States throughout the United States and from Manitoba and Quebec 

 in Canada. 



Phytobia {Icteromyza) pollinosa (Melander) 



Agromyza pollinosa Melander, Journ. New York Ent. Soc, vol. 21, p. 263, 1913. 

 The eyes are heavily pollinose (fig. 87) , a character which separates 

 this species from other North American species. It is closest to 

 Phytobia (Icteromyza) Longipennis in having the palpus yellow and the 

 distal third of the femora yellow, but it has the third antennal segment 

 yellow. There are only two known specimens, both from Sikta, 

 Alaska. 



5h. Subgenus Calycomyza Hendel 



Calycomyza Hendel, in Lindner, Die Fliegen der palaearktischen Region, fam. 

 59, p. 65, 1931.— Frick, Ann. Ent. Soc. Amer., vol. 49, p. 284, 1956 (figures 

 of larval characters and types of leaf mines of five species). 



This subgenus is placed among the more specialized subgenera on 

 the basis of the usual lack of a presutural dorsocentral and the circular 

 or irregular form of the posterior spu-acles of two of the six described 

 larvae. The species found north of Mexico were recently revised by 

 Frick (1956b). Previously, species of the subgenus Calycomyza 

 were distinguished by the three postsutm'al dorsocentral setae and 

 the black legs. A number of North American species were described 

 in which the forefemur is distally narrowly yellow and two— Phytobia 

 (Calycomyza) majuscula and P. {C.) gigantea — that have four post- 

 sutural and none to thi'ee presutm-al dorsocentrals. P. (C.) meridiana 

 has the third antennal segment yellow, a unique character for this 

 subgenus. The larvae of only sLx species are loiown. There are 

 usually three bulbs on each posterior spu'acle but one Palaearctic 

 species has from three to five while one Nearctic species has five to 

 eight in a circle and one Holarctic species has about 10 irregularly 

 arranged. 



The large number of species found in North America was sur- 

 prising considering that only five are known in the well-collected 

 Palaearctic region. Of the 17 species described from North America, 

 three are Holarctic, three others are found in both Nearctic and 

 Neotropical regions, eight are strictly Nearctic, and four are Neo- 

 tropical only. 



