176 MOSQUITOES OF NORTH AMERICA 



Forested regions of tropical America, exclusive of the greater Antilles. 



The larvae inhabit water collected in dead parts of plants or in bases of 

 leaves, etc., when rich in decomposing organic matter. They seem especially 

 partial to cocoanut-shells which contain the decomposing remains of the meat 

 of the nut as well as portions of dead insects. They occur in artificial recep- 

 tacles, such as tin cans, when the contained water is foul enough. The larvse 

 soon die if transferred to clear water. They always occur together in some num- 

 bers. The eggs are laid either singly, and are then furnished with ridges that 

 act as floats, or in boat-shaped masses, according to the species. The larvas 

 develop fairly rapidly when the food is abundant, otherwise with considerable 

 slowness, and if food is very scant, they can live for a long period. The adults 

 are diurnal ; the flight is slow, with the legs extended ; they approach man, but 

 seldom attempt to bite. We find no records of their having been observed to bite, 

 but it is possible that they do so. 



The most important character diagnostic of this genus is the presence of setae 

 on the clypeus. These are coarse and distinct in some species, but small and 

 weak in others. Their distribution upon the clypeus is likewise variable in the 

 different species. 



The genus was first characterized by Theobald under the name Trichopro- 

 sopon; but this is too similar to Trichoprosopus Macquart, differing only in 

 termination, and we have preferred to adopt Blanchard's substitute, Johlotia. 

 Lutz and others have attempted to use both names for different generic assem- 

 blages, which is not justified (see remarks under Lesticocampa) . 



Tables of the Species, 

 adults, structure and coloration. 



1. Hind legs with fourth and fifth tarsal joints white., digitatus Rondani (p. 176) 

 Hind legs with part of third joint also white 2 



2. Clypeus with a fringe of small hairs mixed with a few scales 



mogilasia Dyar & Knab (p. 181) 

 Clypeus with a row of fine hairs along each side, none in front 



tricTiorryes Dyar & Knab (p. 183) 



Adults, Male Genitalia. 

 (See the table of Lesticocampa, page 163.) 



Larv^ 



1. Mandibles concealed, invisible from above digitatus Rondani (p. 179) 



Mandibles projecting, visible from above 2 



2. Eighth segment with a large tuft near tube. . . trichorryes Dyar '& Knab (p. 184) 

 Eighth segment with a single hair in this position 



mogilasia Dyar & Knab (p. 183) 



JOBLOTIA DIGITATUS (Rondani) Dyar & Knab. 



Culex digitatus Rondani, Baudi e Truqui, Studi Entomol., 109, 1848. 



Trichoprosopon nivipes Theobald, Mon. Culic, ii, 285, 1901. 



Trichoprosopon nivipes Giles, Gnats or Mosq., 2 ed., 367, 1902. 



Johlotia nivipes Theobald, Mon. Culic, iii, 3'34, 1903. 



Trichoprosopon nivipes Lutz, in Bourroul, Mosq. do Brasil, 68, 1904. 



Johlotia nivipes Blanchard, Les Moustiques, 429, 1905. 



lohlotia (Trichoprosopon) nivipes Goeldi, Os Mosq. no Para, 120, 1905. 



Johlotia nivipes Theobald, Ann. Mus. Nat. Hung., iii, 109, 1905. 



Johlotia nivipes Theobald, Gen. Ins., Culic, 33, 1905. 



Johlotia niveipes Dyar & Knab, Journ. N. Y. Ent. Soc, xiv, 225, 1906. 



Trichoprosopon nivipes Dyar, Proc Ent. Soc. Wash., viii, 20, 1906. 



Trichoprosopon nivipes Coquillett, U. S. Dept. Agr., Bur. Ent., Tech. Ser. 11, 27, 1906. 



Trichoprosopon nivipes Theobald, Mon. Culic, iv, 593, 1907. 



Johlotia digitatus Dyar & Knab, Journ. N. Y. Ent. Soc, xv, 206, 207, 1907. 



Johlotia digitatus Busck, Smiths. Misc. Colls., quart, iss., Iii, 76, 1908. 



Trichoprosopon nivipes Peryassu, Os Culic. do Brazil, 53, 271, 1908. 



Trichoprosopon nivipes Theobald, Mon. Culic, v, 557, 1910. 



