636 JOURNAL, BOMBAY NATURAL HISTORY SOCIETY , Vol. XVI. 



Colex concolok Robineau Desboidy. 

 Memo. d. 1. Soc. d'Hist. Nat. de Paris, IV. 403. 

 Mono, Culicid II., p. 107, 1901 ; III., p. 230, 1903. 

 This mosquito is the same as Culex tigripes Grandpool. (1900). Tigripes is a 

 spotted legged variety of C. concolov. 



It was found only once breeding in an old tank at D'thala containing rain 

 water. It was feeding on C.fatigans. 



This completes the detailed notes on all the species of Culicidse found by 

 me in the district. It only remains for me to mention a Culicid acarid 

 which I found parasitic on two species of Anopheles. (Anopheles jehaji). 

 Mr. Theobald mentions it occurring on the Egyptian Anopheles. He says 

 " Many of the specimens showed the presence of a parasitic tick attached to 

 them. When alive the parasite resembles a minute preserved cherry. As a rule 

 this parasite is attached to the undersurface of the thorax and abdomen, but it 

 was once found on the wing of an Anopheles." This acarid was also found 

 on A. arabiensi*. This tiny insect (Fig. 26) measures 25 millimeters and is 

 of a lemon yellow colour. It has six legs and the claws are unequal and 

 uniserrated. I was at first puzzled as to how it attached itself to its 

 host. It struck me it might possibly be on the larvre and after some hundreds 

 were examined I found one attached to a larvae just on the outer side of the 

 1st abdominal segment. I later found two attached to pupa. The specimen 

 on the larva transferred itself from the pupa to the adult mosquito when it 

 hatched out. It was most frequently found on the under surface of the 

 adults close to the head, but I have seen it on the dorsum. On the pupa it 

 fixes itself in the concavity between the abdomen and thorax. I kept many 

 for days in water, but never observed any further development. 



I would like to say a few words on the maximum flight of the Arabian 

 Anopheles and also on malaria prophylaxis which may be useful to others. 



Since starting the study of the mosquitoes I was constantly making observ- 

 ation on the maximum flight of anopheles. At Nobat in May .1904, I lived in a 

 Staff Sergeant's tent on the ridge, the river was directly below about 450 yards. 

 The wind at night was always fairly strong and from the S.E. Every morning 

 I was able to capture from 6 to 10 female anopheles, (4. arabiensis) in my tent 

 and in the tents on tne further side about 800 yards from the river, I caught 

 from 50 to 60 every morning. At that time there were many cases of malaria 

 in hospital. The camp at Nobat has now been moved 1| miles from the 

 river, there is no water of any description lying between the camp and the 

 river and yet in January 1905 I caught a large number of A. dthali. This 

 anopheles was undoubtedly flying this distance to obtain its food, though 

 there was a large Arab village close by. The only explanation I can offer is 

 that as the Arab tents and houses were constantly full of smoke, the mos- 

 quito preferred to travel further, where they would not be put to this 

 inconvenience. I need hardly say that though some water was obtained 

 from the river, every precaution was taken to present larvaa from being 



