Taxonomic history

Xyleborus interjectus Blandford, 1894c: 576.

Euwallacea interjectus (Blandford): Saha and Maiti, 1984: 2. 


Xyleborus pseudovalidus Eggers, 1925: 159. Schedl, 1958a: 155.


3.5−3.9 mm long (mean = 3.78 mm; n = 5); 2.4−2.64 times as long as wide. This species is distinguished by the pronotum appearing subquadrate (type 3) from dorsal view; outer margin of protibia round; declivital interstriae 1 granulate; posterolateral costa smooth, never granulate; and moderately large size.

It can be further separated from the strongly morphologically similar species E. validus by the gradually sloped declivity; declivital strial punctures shallow giving the declivity a smooth appearance; and tubercles on interstriae 2 extending from base to apex.

May be confused with

Euwallacea funereus, E. validus, and E. velatus


from the Indian subcontinent and China through Southeast Asia and Indonesia to the Philippines, New Guinea and Solomon Islands; introduced to North America, Hawaii and South America (Argentina) (Halbert 2011, Cognato et al. 2015, Gomez et al. 2018b; Landi et al. 2019); recorded in the study region from Bangladesh, China (Anhui, Chongqing, Fujian, Gansu, Guandong, Guizhou, Hainan, Hong Kong, Hubei, Hunan, Jiangsu, Jiangxi, Sichuan, Yunnan, Xizang), India (Andaman Is, Arunachal Pradesh, Assam, Kerala, Madhya Pradesh, Maharashtra, Meghalaya, Sikkim, Tamil Nadu, Uttarakhand, West Bengal), Laos, Myanmar, Nepal, Taiwan, Thailand, Vietnam

Host plants

polyphagous (Beeson 1930, Browne 1961b)

DNA data

Sequences available for COI and CAD.

COI: MN619930MN619931MN619932MN619933MN619934MN619935MN619936KP250565KP250550KP250573KP250574KP250567

CAD: MN620204MN620205MN620206MN620207MN620208MN620209MN620210MN620211 

Additional COI sequences from across Asian and North Ameircan populations are given in Cognato et al. 2015.