60 ENTOMOLOGICAL SOCIETY 



The paper was discussed by Messrs. Ashmead, Howard, Stiles, 

 and Gill. Dr. Howard mentioned the interesting observation, 

 recorded by Mr. S. I. Smith, of New Haven, Connecticut, that 

 Chironomus larvae had been found in Lake Superior at a depth 

 of 600 feet below the surface of the water. Dr. Packard, Dr. 

 Howard continued, had found larvae of some species of Chirono 

 mus in salt water in Salem Bay. Dr. Howard noted further that 

 Anopheles punctipennis had been found breeding in brackish 

 water at the head of Chesapeake Bay. On his late trip he had 

 found the burning of pyrethrum powder in his room very effective 

 against mosquitoes. Culex pipiens was the only mosquito met 

 with in Mexico, and this species, according to Prof. Herrera, was 

 probably introduced thither from the lower Rio Grande Valley, 

 Texas, at the time of the opening up of the Mexico Central Rail 

 road. 



The concluding paper was by Dr. Stiles, entitled : 



THE CATTLE TICKS OF NORTH AMERICA. 



By CH. WARDELL STILES. 



{Author's Abstract.) 



Doctor Stiles presented before the Society the final proof sheets, 

 with illustrations, of an article entitled the " Cattle Ticks (Ixodo- 

 idea) of North America," prepared by Doctor Salmon and him 

 self for publication in the Annual Report of the Bureau of Animal 

 Industry. He discussed the various species briefly,' noting sev 

 eral changes in the designation of some of the parasites in ques 

 tion. Contrary to the views of Europeans, he is inclined to recog 

 nize Boophilus as distinct from Rhipicephalus, and he called 

 attention to the necessity of accepting the genus Boophilus as 

 basis of quarantine hereafter against Texas fever, instead of the 

 species Boophilus bovis. He brought out the interesting fact 

 that the Boophilus of Cuba is distinct from the form which occurs 

 in the United States, and apparently agrees with the species found 

 in Australia. Heretofore there has been considerable difficulty 

 in distinguishing between Dermacentor reticulatus and Derma- 

 centor electus, better known as Dermacentor americamis. 

 He stated that Dermacentor electus has nothing whatever 

 to do with the original Acarus americanus, which is evi 

 dently Amblyomma unipunctatum, and that it may be easily dis 

 tinguished from Dermacentor reticulatus by the difference in 

 the structure of the stigmata. In Dermacentor reticulatus the 



