27 



C. wehsteri Coq. was collected April 17, 1SS7, by Prof. F. M. Web- 

 ster at Ashwood, La., on bushes in company with a species of Si- 



mulium. 



0. mutabilis Coq., reared from human excrement by the writer in 

 the District of Columbia June 17, occurs also at Jacksonville, Fla. 

 (Mrs. A. T. Slosson, collector). 



C. griseus Coq. was captured on human excrement by the writer at 

 Travilah, Md., in June. It has been collected also in Florida and 

 Arizona, and Prof. T. D. A. Cockerell found it on a horse at Pecos, 

 X. Mex. This species, as well as C. mutabilis, were recorded by 

 Dr. L. O. Howard in an article on the insect fauna of human excre- 

 ment as "Ceratopogon species." a 



C. specularis Coq. was reared by Mr. C. L. Marlatt from horse and 

 cow manure during his investigation on the horn fly (H&matobia 

 serrata R.-D.) in Virginia in 1889. It has been collected also at 

 Springfield, Mass. (Dimmock); Philadelphia, Pa., June 28, and 

 Natrona, Pa., July 30 (C. W. Johnson); District of Columbia, August 

 11 (F.C.Pratt); Woodside, Md., October 12 (J. E. Benedict, jr.); War- 

 renton, Va., August 23, and Rosslyn, Va., December 30 (C. L. Mar- 

 latt), and in Colorado. 



W. H. Long 6 found larvae of this species on the under side of dry 

 cow dung from August to December, but more abundantly during 

 November and December, in companv with C. brumaMs at Austin, 

 Tex. 



C. brumalis Long. Mr. W. H. Long writes of this species as fol- 

 lows: c 



During November, December, and January the larvae of this species were found in 

 immense numbers on the under side of nearly dry cow dung. They seem to feed od 

 the dung, never penetrating very far into the substance. No eggs were found. The 

 duration of the larval stage seems to Vie several weeks, that of the pupal stage seven 

 to ten days. * * * Several hundred larvae of all ages were found on the under 

 surface of a piece of moist rotting elm wood; similar larvae and puparia were also 

 found in the nests of the common foraging ant (Eciton ccecum) on several different 

 occasions. 



Mr. Long states that he reared imagines from larvae taken in these 

 various situations and they proved to be the same species. It is 



known from Austin, Tex. 



C. stenummatis Long. Long writes of this species as follows : d 



The specimens were received from Dr. W. M. Wheeler, who found them in the nest 

 of an ant (Stenammafulvum subsp. aquia) at Colebrook, Conn., August. L900. They 

 were moving about in the refuse heaped up by the ants in certain portions oi their 



nests. The species seems to be a genuine inyrmecophile like the European speeies 

 (C. Braueri Wasmann). 



«»Proc. Wash. Acad. Sci., Vol. 11. p. 559, L900 



b Biol. Bui., Vol. Ill, pp. 7 10. figs. 3 6 m pari I, L902. 

 cL. c., Vol. Ill, pp. 3-7. tigs. 1. 2, 6 (in part . 

 dL. c, p. 10, figs. 4. (in pari i. 



