Pachybrachis erinae Barney, 2018

Barney, Robert J., 2022, Monitoring of Pachybrachis Chevrolat (Coleoptera: Chrysomelidae: Cryptocephalinae) Diversity and Abundance in Illinois for 140 Years: Recent Detections and Presumed Extirpations, The Coleopterists Bulletin 76 (4), pp. 489-496 : 493-494

Pachybrachis erinae Barney (Presumed EXtirpated)

Only two specimens of P. erinae have been detected in Illinois. Barney (2018a) reported this species as having a broad range in the eastern United States but rarely collected. The last specimen collected in Illinois was almost 40 years ago .

Pachybrachis femoratus (OliVier) (RelatiVely Secure)

Pachybrachis femoratus is uncommon in Illinois. Barney (2017a) reported P. femoratus as primarily found in the eastern coastal states on Quercus L. ( Fagaceae ) species. Illinois is on the western edge of this species’ range.

Pachybrachis gibsoni Barney (RelatiVely Recent Detection)

Pachybrachis gibsoni is relatively common in several Illinois River and Mississippi River hill prairies but was not detected until the 1960s. Barney (2018a) reported P. gibsoni as distributed across the eastern United States to the 100 th meridian .

Pachybrachis hepaticus (F. E. Melsheimer) (RelatiVely Recent Detection)

Pachybrachis hepaticus is relatively rare in Illinois; the first specimens were collected at Thomas-Fulton Sand Prairie, Whiteside County during 1982 ( Table 2). Barney (2019b) reported this species as likely found in all 48 contiguous states.

Pachybrachis jacobi Barney (RelatiVely Recent Detection)

Pachybrachis jacobi is relatively common in several Illinois River and Mississippi River hill prairies, but was not detected until the 1960s. Barney (2018a) reported P. jacobi as having a scattered distribution across eleven states, with Illinois on the northern edge of its distribution.

Pachybrachis laevis Bowditch (RelatiVely Recent Detection)

Seven specimens of P. laevis were found at Revis Hill Prairie , Mason County during 2016, with an additional male found there in 2020 ( Table 2). These specimens represent not only a new state record, but also an extreme eastern extension of its known distribution ( Barney 2021a) . Two female specimens were erroneously reported as Pachybrachis lodingi Bowditch by Barney (2018a).

Pachybrachis luridus (Fabricius) (RelatiVely Secure)

Pachybrachis luridus was found consistently in Illinois from the later 1880s to the present day ( Table 2). Barney (2017a) reported this species as widespread in the eastern United States from the Atlantic Coast to the 100 th meridian. Pachybrachis luridus is one of the more common species in the genus and is expected to remain so in the future.

Pachybrachis matthewi Barney (RelatiVely Recent Detection)

Two specimens of P. matthewi were found south of Meredosia, possibly Meredosia Hill Prairie , Morgan County in 1961 ( Table 2), and three specimens were found during 2020 in Pembroke Savanna Nature Preserve. Barney (2018a) reported this species as distributed in the mid-Mississippi River Valley , with Illinois on the northern edge of its distribution .

Pachybrachis mcmeansi Barney (Presumed EXtirpated)

A single specimen of P. mcmeansi was captured in Champaign, Champaign County during 1888. Barney (2018a) reported this species as having a scattered distribution from Maine to Arkansas, with Illinois on the northern edge of its distribution. Pachybrachis mcmeansi is probably not extant in Illinois.

Pachybrachis m-nigrum (F. E. Melsheimer) (Presumed EXtirpated)

Specimens believed to be P. m-nigrum have been consistently captured since the late 1800s. However, Riley and Barney (2015) determined that the majority of these beetles were actually a new species, P. deceptor ( Table 2). Only one specimen of P.m-nigrum has been collected in Illinois since 1981 .

Pachybrachis morosus Haldeman (RelatiVely Recent Detection)

A single specimen of P. morosus was collected in Fults Hill Prairie Nature Preserve, Monroe County during 1981 ( Table 2). Barney (2019c) reported this species as being found from the eastern seaboard to southern Mexico. Additional specimens should be found in Illinois on Quercus species.