Revisiting the taxonomy of the genus Diatraea Guilding with a focus on Diatraea tabernella Dyar, using dichotomous keys, in Panama

Diatraea tabernella Dyar is a key pest of sugarcane in Panama and causes significant crop losses. The objective of this study was to conduct a literature review of the Diatraea genus in Panama, focused mainly on D. tabernella, complemented with the identification of the most important morphological characteristics to determine the species D. tabernella. Reference data were collected from literature about Diatraea genus focused mainly in Panama. Adults, larvae and pupae were collected, preserved and later identified in the laboratory. Of the 41 species of the genus Diatraea reported in the most recent literature, seven are present in Panama, including D. tabernella. The most important morphological characteristics in D. tabernella were the presence of lateral lobes of the tegumen in male genitalia (adult), thoracic dorsal mesothelium (larva) and cephalic horns (pupa). The combination of these characteristics allows the identification of the species

A Continuum-Based Approach for Tightness Analysis of Chinese Semantic Units

PACLIC 23 / City University of Hong Kong / 3-5 December 200

Iterated Belief Change and the Levi Identity

Most works on iterated belief change have focussed on iterated belief revision, namely, on how to compute (K star x) star y. However, historically, belief revision has been defined in terms of belief expansion and belief contraction that have been viewed as primary operations. Accordingly, what we should be looking at are constructions like: (K+x)+y, (K-x)+y, (K-x)+y and (K-x)-y. The first two constructions are relatively innocuous. The last two are, however, more problematic. We look at these sequential operations. In the process, we use the Levi Identity as the guiding principle behind state changes (as opposed to belief set changes)