The Canadian Entomologist 125: 439-447 (1993) A seasonal light-trapping study of Culicoides species, in particular C. obsoletus Meigen, was conducted in the Fraser Valley of British Columbia to determine seasonal peaks and first and last appearance of these insects. Culicoides obsoletus is the causal agent of Culicoides Hypersensitivity (CH), an allergic dermatitis in horses, in British Columbia. Trapping at two sites in 1987 showed that C. obsoletus was first trapped in late March, and peaked in early May and again in late June. Small numbers were collected into mid-November. This coincided with the appearance and regression of clinical signs associated with CH in horses in the area. Stabling horses during the peak activity of Culicoides spp. has been recommended to prevent the development of CH. Light-trapping Culicoides both inside and outside stables showed that although fewer insects were caught inside, some (6%) were trapped indoors. A horse kept in an unscreened stable will not be protected from being bitten. Anderson, G.S., P. Belton et E.M. Belton. 1993. ~t u d e dkmographique de Culicoides obsoletus Meigen (Diptera: Ceratopogonidae) et d'autres espt.ces de Culicoides dans la vallCe du Fraser, Colombie-Britannique. The Canadian Entomologist 125: 439447. Resume L'installation de pieges lumineux dans la vallCe du Fraser, Colombie-Britannique, a permis dlCtudier I'abondance saisonnikre des especes de Culicoides, en particulier de C. obsoletus Meigen, et de determiner les pCriodes de densite maximale, de m&me que la premikre et la dernikre apparitions de ces insectes. Culicoides obsoletus est I'agent de transmission de l'hypersensibilitk a Culicoides (CH), une dermatite de nature allergique rencontrCe chez les chevaux de Colombie-Britannique. La piCgeage en deux endroits en 1987 a rCvC1C que les premiers C. obsoletus sont apparus a la fin de mars, qu'ils ont atteint une densit6 maximale au debut de mai et de nouveau a la fin de juin. De petits nombres ont CtC rCcoltCs jusqu'a la mi-novembre. Ces pCriodes d'abondance co'incidaient avec I'apparition et la rkgression des symptomes ;liniques associCs a la dermatite CH chez les chevaux de cette rCgion. La stabulation des chevaux a CtC recom-mandCe comme moyen de prkvention de ia maladie. L'installation de pikges lumineux a I'intCrieur et a I'extCrieur des Ctables a permis de constater que, bien que moins nombreux a I'intCrieur, certains insectes (6%) ont quand m&me CtC capturCs dans les Ctables. Un cheval gardC dans une Ctable non protCgCe par des moustiquaires n'est donc pas ? I I'abri des morsures. [Traduit par la rCdaction]
Thanatosis (pretending to be dead), sometimes called letisimulation, is widely used as an anti-predator strategy by snakes. Herein we report six cases of death-feigning in six species of Panamanian snakes (Dark-headed Red Falseboa, Pseudoboa neuwiedii; Double-banded False Coralsnake, Erythrolamprus bizona; Forest Flamesnake, Oxyrhopus petolarius; Rufous-headed Snake, Amastridium veliferum; Colombian Long-tailed Snake, Enuliophis sclateri; and Pacific Banded Coffee Snake, Ninia maculata). We also present a literature review of thanatosis in American snakes and discuss the terminology associated with this behavior.
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