Badister (Trimorphus) transversus Casey 1920

Badister (Trimorphus) transversus Casey
Badister transversus Casey, 1920:218; [type specimen a male, in Casey Coll., USNM No. 473711]. Type locality: probably Indiana (fide Casey), Levette coll; (determined from original description; type specimen labelled The strong iridescence of the surface of the pronotum is the best single external diagnostic character of this species.
Description of color and sculpture. — Male. Arlington, [Suffolk Co.], Massachusetts], V.16.25, (Darlington; treading), [Cornell University Coll.]. Generally piceous except as follows : labrum and clypeus and margins of pronotum and elytra rufo-testaceous, basal segments of palpi testaceous, antennal scape testaceous basally becoming rufo-piceous apically, flagellum piceous to rufo-piceous apically, legs rufo-testaceous, coxae and epipleurae rufo-piceous. Microsculpture : head — dorsal surface approximately isodiametric, surface shin
ing but not iridescent; pronotum and elytra — lines of microsculpture transverse, very close together, not forming obvious meshes, surface of both strongly iridescent.
Variation. — See tables 63 and 64 for data on variation in length and width. Color varies slightly as follows : clypeus and labrum always about the same color in a single specimen, vary from the " normal " rufo-testaceous to rufo-piceous in a single female from Dorchester, Mass. The palpi vary from testaceous to rufo-piceous, the basal segments always paler than the terminal segments, and the antennae show about the same range of variation. The scape is usually paler basally than apically. The lateral and ventral thoracic sclerites are always slightly paler than the pronotum, and the pronotum varies from piceous to rufo-piceous. The elytra exhibit about the same range of variation in color and are always of about the same color in a given specimen. The epipleurae vary from rufous to rufo-testaceous and are always paler than the dorsal surface of the elytra. The abdomen varies from dark piceous to rufous, being piceous on the average.
The pronotum (fig. 128) varies slightly in shape, the sides usually slightly sinuate posteriorly, but this sinuation is lacking in a few specimens.
Because it is conceivable that this species may be confused, on the basis of external characters, with the northern subspecies of Badister flavipes, B. transversns is compared with the former species with respect to a series of ratios which may be helpful in distinguishing between these nominate forms. Data on variation in the following ratios are presented in tables 65-68 which accompany the description of Badister flavipes Le Conte — W head/W 1. elytron, PN : W wp/W head, PN : W base/ W apex, PN : W base/L.
The male genitalia (figs. 152a-c) do not exhibit any appreciable variation. The 8th sternite and retractile stylus of the female are illustrated (figs. 162 and 163).
Synonymical notes. — The specimen labelled as type of Badister micans in the Le Conte collection is a member of this species, so possible micans and transversus are synonymous. However, I doubt this for reasons presented in the discussion of the synonymy of Badister (Baudia) ocularis Casey. Distribution. — This species seems to be primarily northeastern in distribution, ranging from Quebec southward to Long Island on the East Coast, and westward to Indiana.
In addition to the type, I have seen nine males and sixteen females collected in the following localities.
Connecticut: Litchfield County; Cornwall. Indiana: Elkhart County; Elkhart. " Kosciusko County." Maine : County not determined ; Wales. Massachusetts: "Mass." Suffolk County; Arlington, Dorchester. New Hampshire: Rockingham County; Exeter. New Jersey: Hudson County; Arlington. New York : Cayuga County ; Howland Island. Tompkins County ; Ithaca. Wayne County; Crusoe Lake. County not determined; North Beach L. I. Ohio : Ashtabula County ; Jefferson. Quebec : Como, Montreal.

Badister transversus is a species of ground beetle in the family Carabidae. It is found in North America.