Cerodontha (Butomomyza) angulata (Loew)

Eiseman, Charles S., Lonsdale, Owen, Linden, John Van Der, Feldman, Tracy S. & Palmer, Michael W., 2021, Thirteen new species of Agromyzidae (Diptera) from the United States, with new host and distribution records for 32 additional species, Zootaxa 4931 (1), pp. 1-68 : 21-22

Cerodontha (Butomomyza) angulata (Loew)

Material examined. IOWA: Winneshiek Co., Freeport Marsh , 18.vi.2017, em. vii.2017, J. van der Linden, ex sedge, # CSE4658 , CNC1144048 (1♁) ; MASSACHUSETTS: Nantucket Co., Nantucket, Squam Swamp , 27.vii.2017, em. 26.iv–1.v.2018, C.S. Eiseman, ex Juncus tenuis , # CSE4444 , CNC1135688–1135689 (1♁ 1♀) .

Hosts. Cyperaceae : Carex crinita Lam. , C. stipata Muhl. ex Willd. , Scirpus hattorianus Makino ; Juncaceae : * Juncus tenuis Willd. , Luzula DC. ; Poaceae : Dichanthelium acuminatum (Sw.) Gould & C.A.Clark , D. clandestinum (L.) Gould ( Eiseman & Lonsdale 2018).

Leaf mine. Whitish, occupying the full width of the narrow leaves of Juncus tenuis , and not distinguished in the field from a mine that produced a female tentatively identified as Cerodontha (Poemyza) incisa (Meigen) ; see Eiseman & Lonsdale (2018) for a discussion of mines on other hosts.

Puparium. Oval, typically reddish-brown but ranging from yellowish-brown to blackish-brown; formed within or outside the mine. See Eiseman & Lonsdale (2018) for further details.

Phenology and voltinism. This species is multivoltine in Massachusetts. We have exceptionally found larvae in mid-April (adult emerging in early May), and they are common beginning in June. Many of our collections have been of puparia, but we have observed larvae in late July and in October. Reared adults have emerged in July, August, and September, always within a few weeks of collecting larvae or pupae, with 25 September being the latest emergence date. The new specimens from Nantucket are unusual in having overwintered as pupae from larvae collected as early as 27 July. In North Carolina we have found feeding larvae as early as 10 January.

Distribution. Probably present in most states; Canada: AB, ON; Europe ( Eiseman & Lonsdale 2018).