39 



on an infected animal, but it failed to transmit disease after a longer 

 interval. T. striatus, however, was found capable of transmitting 

 surra (in one experiment with two flies) as long as 72 hours after 

 feeding on an infected host. Smaller species, such as a Tahanus near 

 virgo, were tried, but were not found to transmit disease. Gteno- 

 cephalus felis and dog and cattle fleas were also found incapable of 

 transmitting surra. Philaematomyia insignis is only capable of 

 transmitting surra in the case of an immediate interrupted feeding, 

 the maximum interval, between leaving an infected host and 

 commencing to feed on a previously uninfected animal, for which 

 positive results were obtained, being only seven minutes, although 

 positive results were obtained by direct inoculation of abdominal 

 contents of infected flies as long as 28 hours after feeding on a 

 surra-infected animal. 



Surra is not transmitted hereditarily to the progeny of infected 

 females of Tahanus striatus, T. albimedius, or Philaematomyia insignis. 



The mosquito campaign was continued at Pusa with considerable 

 success ; the species found breeding on the estate included Anopheles 

 fuliginosus, A. cuUcifacies, A. rossi, Culex fatigans, C. gelidus, 

 C.sitiens, Wied. {micfo-annulatus, Theo.), Taeniorhgnchustenax, Stego- 

 myia scutellaris, S. sugens, and S.- gubernatoris. Pseudograbhamia 

 macidata, not previously occurring at Pusa, was also found and 

 reared. The results of a series of experiments on the role of blood 

 in the development of eggs in mosquitos will shortly be published. 

 >S. scutellaris was found capable of oviposition without having fed 

 on blood, and, while depositing as many as three batches of eggs 

 after only one meal of blood, may deposit several batches after one 

 fertilisation. 



Many maggots causing myiasis in domestic animals have been 

 received and the flies bred out from them. 



Among the ticks received, Ornithodoros savignyi was under 

 observation throughout the year. A species identical with, or near, 

 0. lahorensis was received from Agra. Both were fed on goats. 



CoNNAL (A.) & CoGHiLL (H. S.). Annual Report of the Medical 

 Research Institute of Nigeria for 1915, London, 1916, 29 pp. 

 [Received 11th January 1917.] 



The following blood-sucking insects were reported during the 

 year : — Muscidae : Glossvna palpalis, G. tachinoides, Stomoxys nigra, 

 and S. omega. Tabanidae : Tahanus secedens, T. socialis, T. thoracinus, 

 T. fasciatus, T. taeniola, T. par, T. kingsleyi and Hippocentrimi 

 versicolor. Culicidae, some of which were bred from the larvae, 

 included : Culicioniyia nebulosa, Ochlerotatus nigricephalus, 0. irritans. 

 Anopheles costalis, A. mauritianus, Mansonioides africanus, Culex 

 duttoni, C. thalassius, C. consimilis, C. invidiosus, C. tigripes, 

 C. grahami, C. decens, 0. rima, C. fatigans, C. insignis, Stegomyia 

 fasciata, S. luteocephala, S. africana, Banksinella lineatopennis 

 (luteolateralis) and JJranotaenia annidata. 



Of 47 Glossina palpalis examined, trypanosomes were found in 

 the proboscis of two, and in the stomach of two others. One specimen 

 of G. tachinoides was examined with negative results. One Stomoxys 

 nigra contained avian red blood corpuscles in the stomach. One 



