Szekessy Vilmos (szerk.): A Magyar Természettudományi Múzeum évkönyve 59. (Budapest 1967)
Farkas, H.: Eriophyids collected by Dr. Pócs in Vietnam
3 Figs. 1—2. Tetra vietnamica sp. n. $. 1 = Dorsal view of shield; 2 = Female genitalia and coxae. — Figs. 3—5. Diptilomiopus pocsi sp. n. $. 3 = Dorsal view of shield; 4 = Featherclaw ; 5 = Female genitalia and coxae. Remarks. Only a single specimen of Tetra vietnamica was found and this circumstance caused numerous difficulties in the description of the species. The first question is in how far the features observed on the single specimen are valid for the other exemplars of the taxon. The problem can naturally be solved only by the examination of further discovered exemplars, but Tetra vietnamica is so characteristical a species that we might rest assured that the recognition of it will not meet with any difficulties, even if some of the characteristics were not specifically constant. The species can be easily distinguished from all of its known congeners by the flatness of the dorsal side and the narrowness of its concave portion respectively, the obtusely truncate anterior lobe of the shield (in a superior view), and the subserrate state of the straightly truncate end. Another conspicuous feature, absent from other species, is the peculiar shape of the plate, extending onto the first tergite, of the posterior margin of the shield, as well as the direction of the female genital setae (inclined centrally). No centrally inclined genital bristles are known in the Eriophyids, and I found this phenomenon only in the case of Tetra vietnamica. Since, however, only one specimen of the species is known as yet, the possibility is not precluded that this conformation of the setae is a result of the preparation.
