Opinions and declarations Rendered by the International Commission on Zoological Nomenclature

Cicadas form a prominent and strongly audible component of the fauna of Labrador Nature Reserve where their population density can result in rain-like sprays of excrement from the canopy as noted by Sivasothi (2004). The high density of cicadas at a single location may be attributed to a synchronous emergence event. Such an event involving the species Chremistica umbrosa has been recorded at Labrador Nature Reserve in March and April 2010 (Leong et al., 2011). The present observations are in a later part of the year. The cicadas shown on Figs. 2 & 3 are identical in appearance to the emerging Chremistica umbrosa illustrated in Leong et al (2011). However, the emergent cicada in Fig. 4 does not appear (from comparison of the markings on the thorax) to be conspecific, and is tentatively identified as a species of Purana. It suggests that the featured mass emergence event is not limited to one species of cicada.

Rarely collected, Collartidini (4 genera, 14 species) are a tribe of Emesinae (Hemiptera: Heteroptera: Reduviidae), the thread legged assassin bugs, that have retained a number of plesiomorphic features within Emesinae. The group has long been believed to be restricted to equatorial Africa, Madagascar, and Sri Lanka, with more recent additions from the Canary Islands, Sudan, Israel, and Taiwan, and a fossil species from Baltic amber. The discovery of two undescribed species from Thailand and Malaysia (Borneo) has created the need for a reassessment of genera within Collartidini. We analysed a morphological matrix of 25 characters and 11 ingroup species that represents the four collartidine genera, finding that while Collartida Villiers, 1949 is recovered as monophyletic, Collarhamphus Putshkov & Popov, 1995 and Stenorhamphus Elkins, 1962 render Mangabea Villiers, 1970 paraphyletic. We here synonymise the fossil genus Collarhamphus and extant genera Mangabea and Stenorhamphus,provide a revised diagnosis and description of Stenorhamphus, and describe Stenorhamphus segerak,new speciesand S. phuphan,new species,from Malaysia (Sarawak) and Thailand, respectively. Lateral and dorsal habitus images as well as images of diagnostic characters are provided. A map showing the known distribution of Stenorhamphus spp.is provided, in addition to images highlighting diagnostic genus and species level characters.