. 181 



belongs to the Anthomyiidae as defined by Girschner. The species 

 of Cryptolucilia have long been placed among Lucilia, which they 

 resemble in general appearance, but from which they can easily be 

 separated by the absence of hypopleural bristles and by the arrangement 

 of the sternopleural bristles. 



HussEY (R. F). A Bibliographical Notice on the Reduviid Genus 



Triatoma (Hemip.).— -Ps3'c/?6', Boston, Mass., xxix, no. 3, June 1922, 

 pp. 109-123. 

 Among manv papers on the biology and taxonomy of the genus 

 Triatoma (written chiefly between 1910 and 1914), some of which have 

 been previously noticed [R.A.E., B, i, 176; ii, 107], the author dis- 

 cusses in particular the work of Neiva and that of del Ponte [K.A^t., 

 B ix 197] which form important summaries of the known data 

 concerning this genus of blood-sucking Reduviids. A list is given of 

 thirty-nine species, with their synonymy and distribution and a 

 bibliography of recent contributions to the subject. 



Cameron (A. E.). The Morphology and Biology of a Canadian Cattle- 

 infesting Black Fly, Simtdmm simile, Mall. (Diptera, Simuludae). 



— Canada Dept. Agric, Ottawa, Bull. N.S. no. 5 (Ent. Bull. 20), 

 1922, 26 pp., 9 figs. 

 Since the publication of preliminary observations on Simulium 

 simile [R.A.E., B, vi, 179] the author has made a further study of the 

 species and has reared it under conditions approximating as nearly 

 as possible to the natural habitat. Descriptions are given of the various 

 stages which were not previously known. All the immature stages ot 

 the fly are passed in the stony rapids of the north and south Sas- 

 katchewan rivers. The eggs are deposited in cake-like masses, embedded 

 in a soft, gelatinous matrix on the stones near the water-line, where 

 they are kept moist by the spray. These masses consist of thousands 

 of eggs in a single layer, which are apparently the product of a arge 

 number of females. The larvae feed chiefly on diatoms and form large 

 colonies on the stones, as do the pupae. There are probably four 

 generations in a year in central Saskatchewan, but owing to variations 

 in the time of development, the dates of appearance and periods ot 

 persistence of the generations are not well defined. Larvae begin to 

 appear in the first stage as soon as the temperature of the water reaches 

 about 50° F that is, some time in June, and both larvae and pupae 

 occur onwards until October. They are most numerous during the 

 early part of the summer, when the water is high and reaches a tem- 

 perature of about 75° ; the numbers diminish later m the summer 

 owing to the reduction in the extent of the breeding-grounds caused by 

 the recession of the water. The mortality among larvae and pupae 

 due to desiccation arising from the periodic fall of the water-level is 

 sometimes very great, and probably explains in some measure ttie 

 variation in the number of adults from year to year. 



The stage of hibernation is not definitely known, but is probably 

 the egg stage ; it appears possible that this stage may retain its vitality 

 for longer or shorter periods although deprived of moisture. Emergence 

 of the adults takes place from about June to September in large 

 swarms, in which males and females occur in about equal numbers 

 The adults, upon their emergence, are frequently carried by the wind 

 for a distance of perhaps ten or twelve miles. The mortality among 

 emerging adults by drowning is often very large. 



