256 EXPERIMENT STATION RECORD. 



general work of eradication was very striliing since during the second season 

 the chief species of mosquito concerned was seen only in the rarest instances. 



Some attention was given to the natural enemies of mosquitoes. Under the 

 conditions which prevailed in the region in question fish could not be used 

 advantageously, since they would not voluntarily live in the pools where the 

 mosquitoes bred. The best species for use is apparently the stickleback. A 

 number of insects are also mentioned as enemies of mosquitoes. Copper 

 sulphate was used at the rate of 1 part to 1,000 in small pools, but almost with- 

 out effect. The author also discourages the hope that eucalyptus will prove of 

 any great value in the work of combating mosquitoes. 



The species chiefly concerned in the mosquito campaign in question are de- 

 scribed in all their stages and a synoptic table is presented to assist in their 

 determination. A list is also given of the mosquitoes known to occur in 

 California. 



A preliminary report on the horseflies of Louisiana, with a discussion of 

 remedies and natural enemies, J. S. Hine (Crop Pest Com. La. Circ. 6, pp. 

 JfS, figs. 20). — An investigation was made of the distribution of species of horse- 

 flies and their injurious attacks in Louisiana and other parts of the South. 



The larvje usually pass their life in the water or under ground and are, there- 

 fore, seldom observed. The species of Chrysops and many of those of Tabanus 

 lay their eggs on plants over water, while others deposit on plants standing in 

 wet ground. The larvfe feed on animal life of various kinds. Detailed notes 

 are given on the life history of Chrysops i-iUaius and Tabanus atratus. The 

 eggs of the latter species may be carried for many miles in water and the 

 insect may be thus distributed far from the point of its original location. 



A number of natural enemies are known to attack the horseflies, some of these 

 insects being predaceous and others parasitic. The use of nets, oil, and in- 

 secticides of disagreeable odor may give considerable relief. Covering pools 

 of water with kerosene, as recommended by Porchinski, is not always effective. 

 The author recommends collecting the eggs of horseflies in localities where 

 they are most numerous. 



An annotated list is presented of all the species found in Louisiana. 



Some points on the natural history of Tabanidae, especially Tabanus qua- 

 tuornotatus, A. Lecaillon (Compt. Rend. Soc. Biol. [Paris], 60 {1906), No. 9, 

 pp. 459, 460). — The eggs of this species are laid during a period of 2 or 3 

 weeks in June. The females deposit their eggs during the middle of sunshiny 

 days on dry herbage in masses of about 300 to 400. The egg masses are almost 

 always found about 30 to 50 cm. from the ground. The larvfe, as soon as 

 hatched, fall to the ground and penetrate into the soil. 



Habits and life histories of some flies of the family Tabanidae, J. S. 

 Hine [U. S. Dept. Acjr., Bur. Ent. Bui. 12, pt. 2, tech. ser., pp. IV, 19-38, fig». 

 X2). — A detailed account is presented of the life history and habits of Tabanus 

 tasiophthalmus, T. sulcifrons, T. stygius, T. vivax, T. atratus, and Chrysops 

 mcerens. Considerable new information is given, particularly with reference 

 to the place and method of depositing eggs. In some cases this information 

 will be of advantage in devising practical means for controlling horseflies, but 

 these insecticide methods have not been worked out. 



British ticks, E. G. Wheler {Jour. Agr. Scl., 1 {1906), No. 4, pp. 400-429, 

 p]s_ 6). — The ticks of Great Britain have received but little study from a sys- 

 tematic standpoint, and on this account the author undertook an investigation 

 of their life history and habits, as well as a study of their form and relationship 

 to diseases in man and animals. 



The larger part of the article is occupied with a description and classification 

 of the ticks known to the author as occurring in Great Britain. In this 



