Heteroborips Reitter 1913: 79.

Type Species. Bostrichus cryptographus Ratzeburg, 1837, by monotypy

Adult Female Diagnosis. Length 2.1—2.5 mm. Body dark reddish brown. Antennal club type 2 (Hulcr et al. 2007), with segment 1 corneous on both faces of antennal club and segment 2 clearly visible on anterior face, separated from first corneous segment by a suture (Figs. 2—6). Segment 3 visible on posterior side of club. Submentum feebly impressed below level of genae, triangular. Protibia obliquely triangular, broadest at apical 2/3, lateral margin armed with six denticles. Pronotum stout, 1.00—1.05 times as long as wide, appearing strongly convex in dorsal view (conical, type 0 or basic, type 2; Hulcr et al. 2007), with the summit located behind middle in lateral view (tall, type 2; Hulcr et al. 2007), anterior angles rounded, anterior margin of pronotum never with a row of serrations (Figs. 7, 8, 11), pronotal declivity finely asperate, pronotal disc punctate. Scutellum clearly visible, flush with elytral surface. Elytral mycangium visible in H. seriatus as two elongate pit mycangia immediately adjacent to scutellum, one on each elytron, elytral apex rounded, elytral declivity flat to convex.

Adult Male Diagnosis. In his description of Heteroborips, Reitter (1913) also gave characters of the male (Figs. 9, 10, 12, 13). Length 1.5 mm. Body yellowish brown to nearly yellow, dorsoventrally flattened, but distinctly humped at elytral base. Pronotum distinctly longer than wide, smooth, shiny, impunctate, unarmed; appearing dorsoventrally flattened, with long setae laterally. Elytra with irregularly punctate striae; surface covered with long, erect setae and short, sparse, recumbent setae. Mesotibia with a long apical spur.

Discussion. Several morphological features are considered as having significant importance in distinguishing xyleborine genera. These features include the presence and position of a mycangium, scutellum visibility and form, pronotal shape and sculpturing, elytral pubescence, and form of the antennal club. These features were tested in a cladistic framework by Hulcr et al. (2007) and found to be the most useful in diagnosing genera (Hulcr and Smith 2010). The unique combination of a scutellum that is flush with the elytral surface, absence of an elytral mycangial tuft along the base of the pronotum, truncate antennal club, edge of segment 1 continuous on both sides of club with segments 1 and 3 visible on posterior face (type 2; Hulcr et al. 2007), and characteristics of the pronotum described above, plus monophyly found in the Bayesian analysis, sufficiently warrant the recognition of Heteroborips.