560 MOSQUITOES OF NORTH AMERICA 



of segments, narrowly or rather broadly pale yellow on apices ; bristles rather 

 numerous, blackish. 



Wings rather broad, membrane with a very faint smoky tinge; petiole of 

 second marginal cell about half as long as its cell, that of second posterior cell 

 somewhat shorter than its cell ; basal cross-vein less than its own length from 

 anterior cross- vein; veins blackish, their scales brownish black, dense and the 

 outstanding ones narrowly lanceolate and blunt at tips. 



Legs moderately long and slender; femora clothed with violet-black scales 

 outwardly, pale yellow below next the base, the hind ones whole pale golden 

 scaled on basal three-fourths ; knees silvery white-scaled ; vestiture of tibias and 

 tarsi of black scales with faint violaceous luster; posterior tibiae and first two 

 tarsal joints with the scales dense and suberect; otherwise the vestiture is 

 smooth ; last two joints of hind tarsi white. In some specimens the apex of the 

 third joint also is white. Claw formula, 1.1-1.1-1.1. 



Length : Body about 4.5 mm. ; wings 4 mm. 



We have no observations upon life history and habits. The adults have been 

 captured in the daytime while attempting to bite. Mr. Knab caught two on a 

 railroad train in tropical Mexico. 



Tropical America from Brazil to Mexico, exclusive of the Antilles. 



Sao Paulo, Brazil (A. Lutz) ; Rupununi, British Guiana (K. S. Wise) ; Trini- 

 dad, West Indies, June, 1905 (A. Busck) ; Caldera Island, Porto Bello Bay, 

 Panama (A. H. Jennings) ; Rio Cascajal, Panama (A. H. Jennings) ; Taber- 

 nilla. Canal Zone, Panama, May 13, 1908 (A. H. Jennings) ; Bocas del Toro, 

 Panama; Bluefields, Nicaragua (W. F, Thornton) ; Puerto Cortez, Honduras, 

 September 10, 1903 (Dr. Reilly) ; Cacao, Trece Aguas, Alta A^era Paz, Guate- 

 mala, April 2 to 8, 1906 (Schwarz & Barber) ; Puerto Barrios, Guatemala; 

 Livingston, Guatemala, May 5, 1906 (H. S. Barber) ; Polochic River, Guate- 

 mala, June 2, 1907 (A. McLachlan) ; Ceiba, Honduras, August 20, 1903 (D. P. 

 Albers) ; Santa Lucrecia, Mexico, June 21, 1905 (F. Knab) ; Santa Cruz, State 

 of Vera Cruz, Mexico, June 17, 1905 (F. Knab) ; Coatzacoalcos, Mexico (A. 

 Duges) ; Palizada, Mexico, October 5, 1903 (A. Duges). 



Theobald originally identified certain specimens as Walker's discrucians and 

 described them under that name. Later he recognized that they were distinct 

 from discrucians and proposed the new name albipes for them. The specimens 

 mentioned under the description of discrucians are from Trinidad, and the sub- 

 sequent citiation of a specimen from Arkansas does not affect the type locality, 

 which is Trinidad. Theobald previously described lutzii from Brazil, and it is 

 the same species as albipes, the synonymy having been detennined by Coquillett. 

 However, Theobald objected to it (Mon. Culic, iv, 157) saying it "... is 

 quite distinct, having a different ornate thorax and the apex of the second hind 

 tarsal also white." The difference in the ornamentation of the thorax is given 

 thus: 



Thorax with a broad yellow-scaled area on each side lutzii Theobald 



Thorax with creamy lateral scales alMpes Theobald 



Now, North American specimens have " creamy " scales, not the South Ameri- 

 can, which have these scales " yellow." It is evident that Theobald wrongly 

 founded his definition of alhipes upon the Arkansas specimen (which belongs to 

 our species horridus), whereas the type locality is Trinidad. We therefore con- 

 firm the synonymy established by Coquillett, placing discrucians Theobald (not 

 Walker) and alhipes Theobald as synonyms of lutzii Theobald. The presence 

 or absence of white at the apex of the third joint of the hind tarsi, as in other 

 species, is due merely to variation and can not be employed as a specific 

 character. 



