Dyar and Knab Some American Mosquitoes. 161 



albimauus Wiedemann. Neither are they referable to an/yn'tam's Robineau- 

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

 sus Lynch-Arribalzaga, which is another distinct species, as Arribulzaga's 

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

 tion of the palpi, Avhich 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-ARRIBALZAGA. 



Janthinosoma vanhalli Dyar & Knab. 



Culex 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. 



Janthinosoma echinata Grabham, Can. Ent., xxxviii, 311, 1906. 



The form of Janthinosoma occurring in Mexico, Central America, Trini 

 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. 

 We 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 heavily-spined 

 antennae, which are about equally long. We have 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 scJtolasticus 

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

 those of/, in fine 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 diffuse 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. Cat. 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.) 



