AGROMYZID LEAF MINERS — FRICK 429 



Phytomyza gregaria is one of a group of four species having the frons, 

 antenna, and tarsi dark, the forefemur distally yellow to reddish 

 brown, two equally strong upper-orbitals, and four or five rows of 

 acrostichal setae. It may be separated from P. 'periclymeni, P. 

 persicae, and P. ilicicola in having the eye ovoid, at most thi'ee-fourths 

 the eye height, the mesonotum dull brownish black, and with the 

 acrostichal setae extending posteriorly to the thu-d dorsocentral. 

 The larvae make serpentine mines in the leaves of Lonicera involu- 

 crata Banks. As many larvae may be in a single leaf, they frequently 

 form a blotch. My specimens are from California, and Melander's 

 are from Washington and Idaho. 



Phytomyza ilicicola Loew 



Phytomyza ilicis Loew (not Curtis, 1846), Berliner Ent. Zeitschr., vol. 7, p. 54, 



1863 (Centuria iii, No. 99). 

 Phytomyza ilicicola Loew, Berliner Ent. Zeitschr., vol. 16, p. 114, 1872 (Centuria x, 



p. 290). 



Phytomyza ilicicola is one of a group of four species having the frons, 

 antenna, and tarsi dark, the forefemur distally yellow to reddish 

 brown, two equally strong upper-orbitals, and four or five rows of 

 acrostichals. It may be separated from P. gregaria, P. periclymeni, 

 and P. persicae in having the forefemur distally yellow, mesonotum 

 brown, dull bluish poUinose, with the acrostichals extending posteriorly 

 to the fourth dorsocentral. From P. ilicis this species may be dis- 

 tinguished by the tan to brown frons, the narrow gena that is medially 

 one-fourth to one-fifth the eye height (fig. 154), acrostichals in about 

 four rows, and the second costal section 1.9 to 2.8 tunes as long as the 

 fourth (fig. 155). The larvae form serpentine mines in the leaves of 

 Ilex opaca Ait., /. glabra (L.) Gray, /. decidua Walt., and /. vomitoria 

 Ait. I have seen specimens from Texas, Alabama, South Carolina, 

 Virginia, District of Columbia, West Vu'ginia, New York, Rhode 

 Island, and Massachusetts. 



Phytomyza ilicis Curtis 



Phytomyza ilicis Curtis, Gardeners' Chron., July 4, 1846, p, 444, 1846. — Dowries 

 and Andison, Journ. Econ. Ent., vol. 33, p. 948, 1941. — Hendel, in Lindner, 

 Die Fliegen der palaearktischen Region, fam. 59, p. 417, 1935 (figures of 

 head and wing). 



The frons is yellow on the dorsal half and grayish black below. 

 Therefore, this species could be considered as belonging to either part 

 of couplet 1 in the key and is so treated in the key. One of the more 

 distinctive characteristics of this species is the six to eight rows of 

 acrostichals. Phytomyza ilicis may be separated from P. ilicicola 

 by the following characters : frons about one-half yellow, gena medially 

 about one-third the eye height, acrostichals in sLx to eight rows, and 



