Cynomys ludovicianus November 7, 1955. Washington D.C. Richard Griffith, F.W.S. Denver says several dog towns along banks of (Little Missouri R. in Ft. Peck wildlife refuge, Montana. Fred Samtoward manager, Rough county wants area no grazing for 20+ years wherethere are prairie dogs. Ben Orsborn of S.C.S. proved to be a quiet man not sold on his interpretation of situation reported at Brace Mtn., dog town in 1946. He said he made best estimate with facts then at hand. He said he too had noted slender mosquitoes at prairie dog colonies. He had photos of some site John Dec. 1949; still much Cretida there. Compared my 1955 photos with his of 1946 & 9 showed range not much improved (but still apparently suitable for O.B. establishment). He had no leeches or range then, & no photo of official dog town. Mr. P. Allen has now the transits there. Requested copies of his photos of Brace Mtn. town area 1946 & 1949. He said that seasonal differences might produce much Cretida. I talked briefly with H.F. Drahon of S.C.S. & told him of my study & approvals. He agreed that we need many ecological research stations engaged in long range research. Seems very much interested in relation rodents & grazing. At College Park, Md., visited F.W.S. information office where black-white photographs & large color transparencies are filed (2X2 kodak chrome slides in Dept. Bitter, Baldy.). Rex Schmidt in charge. FWS 3228 by C.R. Kelmback is good shot of 2 dogs on one mound. FWS 29 is good side view coyote in blue grana, by Noddan. Some photos a data on cracks