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3. Pronotal collar smoothly convex in profile, never shelflike, often without apparent anterior carina but at any rate less than 3x broader than long. Scutellum (as in b1--Alveoplectrus) nearly always with sublateral grooves or carinae, at least sculpted in some way.
3'. Pronotal collar distinctly horizontal and shelflike, more than 3x broader than long, unsculpted behind anterior carina [these characters failing to apply in some small males, which are recognizable using the scutellar character]. Scutellum (bb1) smooth, without sublateral grooves or carinae.
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Image credits: Schauff, et al. (1997).