Dyar and Knob — Some American Mosquitoes. 161 



albimdniis Wiedemann. Neither are they referable to arjrJ/ntarsisRobineau- 

 Desvoidy, of which they are treated as a variety by Goeldi, nor to albitar- 

 .tus Lynch-Arribfilzaoa, which is another distinct species, as Arribulzaga's 

 figure shows. The form, which is close to albiinniius, differs in the colora- 

 tion of the palpi, which have much more of white. Goeldi's name may 

 therefore be used for this form. Our specimens are from Sao Paulo and 

 Manaos, Brazil, and Trinidad, B. W. I. 



Genus JANTHINOSOMA Lynch-Arrib.4lzaga. 

 Janthinosoma vanhalli Dyar & Knab. 

 Cnlex albitarsis Neveu-Lemaire (not Theobald), Archiv. de Parasit., vi, 

 10, 1902. 

 Janthinosoma vanhalli Dyar & Knab, Proc. Biol. Soc. Wash., xix, 134, 1906. 

 We quote the above synonymy. C. albitarsis Theob. is an African species. 



Janthinosoma posticatus Wiedemann. 



Culex posticalus Wiedemann, Dipt. Exot. 1,43, 1821. 



Jaidhinosoma echinata Grabham, Can. Ent., xxxviii, 311, 1900. 



The form of Janthinosoma occurring in Mexico, Central America, Tiini- 

 dad, Santo Domingo, Jamaica to Brazil, with the hind legs with raised 

 scales, thorax all golden yellow scaled and the abdominal segments below 

 banded with blue-black at base, seems to be uniform throughout its range. 

 It is the Culex posticatus of Wiedemann and is a different species from Jan- 

 thinosoma sayi Dyar & Knab {Culex musicus Say) of the United States. 

 AVe have compared larvae of echinata received from Dr. Grabham with 

 ones from Mexico collected by the junior author and find them identical. 

 The larvae differs from sayi in the much stouter and more heavilj'-spined 

 antennae, which are about equally long. We liave received apparently 

 the same larvae (posticatus) from Estero, Florida (J. B. Van Duzee), but they 

 are unbred. 



Janthinosoma indoctum sp. nov. . 



We propose this name for the larvae called " Janthinosoma scholadicus 

 Theob." (Journ. N.Y. Ent. Soc, xiv. 182, 1906.) The adults resemble closely 

 those of/, infine Dyar & Knab, but differ in the ornamentation of the thorax. 

 In infine the thorax is dark reddish brown with two white spots on the 

 disk, two at the front margin, faint, and whitish scales on the scutellum; 

 In indoctum the thorax is dull brown with yellowish and white scales 

 forming diff"use patches. Scholasticus Theobald is a true Culex. All the 

 indoctum are from Trinidad ; all the infine from Santo Domingo. The lo- 

 cality " Trinidad " should be erased in our description of infine. 



22 specimens, Trinidad (F. W. Urich; A. Busck.) 



Type.— C&i. No. 10,026, U: S. Nat. Mus. 



Janthinosoma insularius Dyar & Knab. 



Janthinosoma insularius Dyar & Knab, Proc. Biol. Soc. Wash., xix , 135 

 1906. 



The larvae of this species are those described and figured by us as " Jan- 

 thinosoma pygmaea Theob." (Journ. N. Y. Ent. Soc, xiv, 182, 1906.) 



