Genus Euwallacea Hopkins

Type species. Xyleborus wallacei (Blandford), desig. Hopkins, 1915

Specimens examined. E. wallacei: Malaysia (holotype, BMNH); New Guinea, Madang Province, Ohu (BHJ); New Guinea, Morobe, Wau (4, Hulcr det. BBM); New Guinea (1, Hulcr det. FICB); New Guinea, Madang Province, Baiteta (1, Hulcr det. IRSNB); New Guinea, Gulf Province, Ivimka (1, Hulcr det. UCD); New Guinea, Madang Prov. (46, Hulcr det., MSUC), Oro Prov. (3, Hulcr det., MSUC), West Sepik (8, Hulcr det., MSUC). E destruens: Indonesia, Java, Gilolo (syntypes, 2 BMNH); New Guinea, Morobe Province, Mt. Kaindi, 2400m a.s.l. (1, Hulcr det. BBM); New Guinea, New Britain (5, BBM); New Guinea, Madang Province, Baiteta ((1, Hulcr det. IRSNB); PNG, Chimbu Prov. (15, Hulcr det., MSUC), Madang Prov. (100, Hulcr det., MSUC), West Sepik (9, Hulcr det., MSUC).

Diagnosis. Euwallacea is similar, and probably a sister or paraphyletic genus, to Wallacellus gen. n. and Fortiborus gen. n. (Fig. 9). Characters distinguishing Euwallacea from Wallacellus include: upper part of eyes as large as lower part (in E. wallacei), first segment of funicle slender, stalk-like, as long or longer than pedicel (except this is also present in W. striatulus); pronotum quadrate to subquadrate (partially overlapping with Wallacellus which has subquadrate to rounded pronotum); protibiae triangular, with 6 or fewer denticles, protibial spur present (a single denticle separated from other equidistant denticles); sockets of tibial denticles enlarged. Characters distinguishing Euwallacea from Fortiborus gen. n. include: first segment of antennal club concave, circular around the club (not recurved, convex); antennal club rounded or taller than wide (antennal club broader than long in several Fortiborus); anterior pronotal edge not elevated, lacking a row of serrations; protibiae triangular, with 6 or fewer denticles, protibial spur present. Characters distinguishing Euwallacea from Planiculus gen. n. include: Much larger size, subquadrate pronotum, pronotal psoterocoxal process slender and inconspicuous.

Comments. Euwallacea was insufficiently described in the original description (Hopkins, 1915), and was later used as a vaguely defined unnatural group defined only by a broad declivity. We attempted to partially remedy the situation by transferring several species into new and hopefully monophyletic genera Fortiborus, Planiculus, and Wallacellus .