Two new species of the genus Austerocardiochiles Dangerfield, Austin & Whitfield, 1999 from Vietnam, viz. A. mellosus Long, sp. n. and A. simulatus Long, sp. n., are described and illustrated. Additionally, the genus Austerocardiochiles is newly recorded for the braconid fauna of Vietnam. The checklist and distribution of already known species of the genus Austerocardiochiles are given. A comprehensive key to Austerocardiochiles species from Oriental region is also provided.

This paper contains descriptions and illustrations of four new species of braconine wasps from two genera Megalommum Szépligeti, 1900 and Nedinoschiza Cameron, 1911 from Vietnam, viz. Megalommum hoabinhense Long, sp. nov., M. simulatum Long, sp. nov., M. sonlaense Long, sp. nov. and Nedinoschiza khuathalinhae Long, sp. nov. Additionally, the genus Megalommum is the first record for Vietnam.

The instintive behaviour exhibited by insects in the selecting  food is always a matter of  interests to entomologists, and it is one of the fundamental principles underlining the application of entomology to agriculture, horticulture and forestry. Food seclection is an important characteristic of insects that help them survive in periods with insufficient foods.Three grain types of food, maize grain, long-grain rice and soybean grain, were used in this sudy for detecting food selection behaviours of maize weevil, Sitophilus zeamais. Grains were kept in box traps put in the different stores in Son La during 90 days. The result showed that maize weevil, Sitophilus zeamais, prefered traps with maize grains (71.4%) considerably more than ones with long-grain rice (14.3%) and soybean grain (14.3%). Meanwhile, the cornsap beetle, Carpophilus dimidiatus, was mostly observed in maize grain (98.5%) and to a lesser degree, in soybean grain (1.5%); and the dried-fruit beetle, Carpophilus hemipterus, was abundantly observed in maize grain (93.1%) and less in soybean grain (6.9%). The red flour, Tribolium castaneum, also tended to select all the three food grain, i.e. maize grain: 53.5%, long-rice grain: 35.2%, and soybean grain: 11.3%.Comparing f beetle individuals captured on three types of food grains showed that the maize weevil, Sitophilus zeamais, is the most abundant species. The percentage this store beetle among all beetles observed in maize, soybean grains and long-rice grains were 57.0%, 84.9% and 27.6%, respectively. Interestingly, Ahasverus advena, foreign grain beetle, occurred abundantly on long-rice gain (61.7%), i.e. this grain is a suitable food for the development of this beetle.

Two new species of the genus Trispinaria Quicke, 1986, from Vietnam, viz. T. seminigra Long, sp. nov. and T. vietnamica Long, sp. nov., are described and fully illustrated. Additionally, this is the first record of the genus Trispinaria in Vietnam. A checklist with distributions of previously described species of the genus Trispinaria is given. Comparative characters of the Vietnamese species are provided and modified key couplets are provided to facilitate their identification.

The relatively small genus Colastomion Baker, 1917 is newly recorded for Vietnam’s braconid fauna and six new species are described and fully illustrated, viz. Colastomion asperum Long, sp. n; Colastomion cephonodes Long & PVLam, sp. n.; Colastomion citrum Long, sp. n.; Colastomion neuterum Long, sp. n.; Colastomion nigroconfusum Long & Pham, sp. n. and Colastomion vietnamenese Long, sp. n. Based on both females and males, a key to the new species from Vietnam is given. Diagnostic characters of the new species are also analyzed and compared with other Colastomion species from the Oriental region. Additionally, the first host record for the new species, C. cephonodes sp. n., is provided as this new species is reared from caterpillars of the coffee hawkmoth, Cephonodes hylas (Linnaeus, 1771).