A review of the Augochloropsis (Hymenoptera, Halictidae) and keys to the shiny green Halictinae of the midwestern United States Author Portman, Zachary M. https://orcid.org/0000-0001-8943-8196 Department of Entomology, University of Minnesota, St Paul, MN, USA zportman@gmail.com Author Arduser, Mike Conservation Research Institute, Cedarburg, WI, USA Author Lane, Ian G. https://orcid.org/0000-0002-6645-2136 Department of Entomology, University of Minnesota, St Paul, MN, USA Author Cariveau, Daniel P. https://orcid.org/0000-0002-3064-0071 Department of Entomology, University of Minnesota, St Paul, MN, USA text ZooKeys 2022 2022-11-18 1130 103 152 http://dx.doi.org/10.3897/zookeys.1130.86413 journal article http://dx.doi.org/10.3897/zookeys.1130.86413 1313-2970-1130-103 C8FFC906D96F43ACA5B9FB21B6E27C33 6007CB98AFAA58A5BD50EA75BBF78B0C Agapostemon (Agapostemon) sericeus (Forster) Diagnosis. The female of Agapostemon sericeus can be recognized by the combination of the metallic green metasoma (as in Fig. 4C ) and the reticulate sculpturing of the scutum (Figs 5B , 6A ). It is most similar to Agapostemon splendens , but Agapostemon splendens has the scutum more punctured (Fig. 6B ) rather than reticulate, and Agapostemon sericeus can be further distinguished by its sharply angled dorsolateral ridge of the pronotum (Fig. 5B ) and by having the ventral pleural tubercle flush with the plate (Fig. 6C ). Male Agapostemon sericeus have S3 and S4 with a low transverse swelling and generally have distinct yellow marks on the apical sterna (Fig. 7C ). They are most similar to males of Agapostemon texanus but can be distinguished by the relative lengths of F1 and F2: in Agapostemon sericeus F1 is slightly more than half the length of F2, whereas in Agapostemon texanus F1 is about three-fourths the length of F2 (Fig. 10 ). They can also be separated by the genitalia (see Roberts 1972 ). Remarks. Agapostemon sericeus was previously known as Agapostemon radiatus (Say) (e.g., Mitchell 1960 ; Roberts 1972 ) but was synonymized by Day and Fitton (1977) . Females of Agapostemon femoratus Crawford, primarily a western species not recorded east of New Mexico, Colorado and Wyoming by Roberts (1972) , are essentially identical to females of Agapostemon sericeus , though the males are quite distinct, possessing a grossly enlarged hind femur, its width and length equal or nearly so. The key in Roberts (1972) indicates the scutum of female Agapostemon sericeus is more distinctly punctate than Agapostemon femoratus , but we do not consider this a reliable separating character. Curiously, there are several Missouri records of Agapostemon femoratus from the 1960s identified by Roberts in separate online databases, (discoverlife.org, Ascher and Pickering 2022 ), but these were not included in his 1972 revision. We have not seen these specimens, but assume they represent mis-determined females of Agapostemon sericeus , not Agapostemon femoratus .