Mosquito ^InuoxiVicc at Blnchhcath. 59 



DossiMOTON, VANunccn Road, 

 Blttckhcatb, S.E., 



8^;* Aiiril, 1902. 



To F. V. TjiKOiiAM), Ksy., Vi.X. 



Dkau Sir,— Many thanks fur your kiiul iiiul interesting' letitr. I 

 am writinir the London County Council on the mutter of treating the 

 p«)nd8 at lilaekheath. I shall Ix' greatly oblitjt-d if you will favour me 

 with the modus operandi of nsiiiL' th«' jH.troleum, ujid if any j>articular kind 

 is used, and where obUiiiRnl. I presume it will destroy any lish that an- in 

 the pond ? 



There are some Culiees about now, hut whether they bite or wiiat, I 

 know not. My ojtinion is, that tlie sjKries that troubles us most in the 

 summer are rather small, and I have notia-d them settle but nevtr 

 api>ear to crawl ; whether that will prove what sjK'cies they arc I do not 

 know. Thanks, I shall be very glad of the data you refer to of larval 

 appearances. 



I suppxis*.' the enclosed large one is a Culex ; there are plenty in out- 

 houses now. My (ijiinion is, that the sunnner species is smaller. I have 

 foimd a couple which were killed against the wall hust sunnner. Are they 

 Anopheles ? 



I am, etc., 



Waltkr Daxxatt, F.E.S. 



BniTisn Museum (Nat. Hist.), 



Cromwell Road, S.W. 

 To Waltku i)A.\x.\TT, E.-Kj., F.E.S., Blackheath. 



Dkau Sir, — As far lus I csin judge, the two remains of the CulicidiB 

 you Bend are those of Culex pipirns, the j)erfect one cerUiinly is. No doubt 

 the smaller one is Cidex donalis, a very vicious biter. 



The iLsual times AnnpJicles maculipennix and different Cider larv;\j are 

 found is in June, July, .\ugust and September. This would be the time 

 to destroy the larvie, I fancy, .-l. bif ureal us, as I mentioned in a previous 

 letter, occurs in the larval stage in winter also. They breed in rain 

 bjirrels, small puddles, etc., so the work must be done very thoroughly. 

 I should advis<.- a look-out to be k"pt for the larviu before the jjurallin 

 treatment is started. 



The pjiniffin is best applie<l by dipping a bundle of nig tied on the end 

 of a stick into the janitlin and then dabbing the ]>ool over in many plaices, 

 so as to g< t the whole surface covereil with a thin lilm. I do not think 

 fish would l>e hurt by the trejitment, and doubt if you can get a Ix'tter 

 sulistitute at present for iNiniflin. I will find out from Dr. Daniels, who 

 has bred CuUx domalis, where they live. The only ones I biv. found 

 were in a small puddle near a tap at Rochester. 



The paratlin tn-atment, I think, should Ixi done two or tha-e timoa at 

 a week's inter^•al soon after the larvic are first notiexnl. 



I am, etc., 



(Signed) Fukd. V. Thkohald. 



