Liriomyza, Mik, 1894

Eiseman, Charles S. & Lonsdale, Owen, 2019, New State and Host Records for Agromyzidae (Diptera) in the United States, with the Description of Ten New Species, Zootaxa 4661 (1), pp. 1-39 : 17

Liriomyza sp. 2

Material examined. CALIFORNIA: San Diego Co., The Slot, 10.iii.2017, em. 8.iv.2017, C.S. Eiseman, ex Phacelia crenulata , #CSE3418, CNC 940072 (1♀); Hawk Canyon, 11.iii.2017, em. 12.iv.2017, C.S. Eiseman, ex Phacelia crenulata , #CSE3457, CNC 940067, CNC 940068 (2♀).

Host. Boraginaceae : Phacelia crenulata Torr. ex S. Watson.

Leaf mine. Linear; further details not observed (not separated from mines of Phytomyza mimuli (Spencer) in the field).

Puparium. Yellow; formed outside the mine.

Comments. The only previous North American record of a Liriomyza from Hydrophylloideae is an unidentified female reared from Emmenanthe penduliflora Benth. in California, treated as Liriomyza sp. 6 by Eiseman & Lonsdale (2018). That fly formed an upper surface mine with frass in strips and beaded strips, in contrast with the usually lower surface mines of Phytomyza mimuli with the frass mostly in discrete grains. We suspect that mines on Phacelia differ in the same way, and it seems likely that it is the same Liriomyza species on both hosts, perhaps one of the polyphagous species such as L. langei Frick or L. trifoliearum . We have also found a possible Liriomyza larva forming an upper surface mine on Phacelia congesta Hook. in Texas, exiting to form a pale brown puparium, as well as a vacated probable Liriomyza mine on Pholistoma auritum (Lindl.) Lilja in Arizona.