1022 MOSQUITOES OF NORTH AMERICA 



angle rounded, with a small tuft of hair ; a row of long basal hairs. Maxilla 

 rounded rectangular, with slightly concave center, margin and center fringed 

 with coarse hairs ; palpus large, slightly serrate without, with a large dendritic 

 tuft, a terminal group of digits and leaf -like appendages. Thorax roimded quad- 

 rate, about as wide as long ; hairs short, consisting of branched hairs, single hairs 

 and tufts, mesothorax sparsely haired. Abdomen stout, anterior segments 

 shorter ; long, feathered lateral hairs on first three segments, double on first and 

 second, single on third; posterior hairs small, smooth; a dorsal series of five 

 pairs of fan-shaped tufts on third to seventh segments (plate 130, fig. 454). 

 Air-tube sessile, subquadrate, roundedly angled posteriorly. Lateral plates of 

 eighth segment posteriorly with a series of spines, long and short ones irregularly 

 disposed, the short ones from one-third to nearly half as long as the long ones. 

 Anal segment about as long as wide, with a small dorsal plate ; dorsal brush a long 

 hair and a short tuft on each side ; a single long lateral hair below the plate ; 

 ventral brush well developed, of long branched tufts. Anal gills moderate, 

 about as long as the segment, blunt pointed. 



Miss Mc&acken found the larvae in an irrigating ditch and in a pool formed 

 by the overflow of a watering trough, both being clear quiet pools. Dr. Dyar 

 found them ia ground-pools. Mr. Jennings found them in ditches, pools and 

 puddles and in pools near streams and in the edges of streams ; also in a tank. 

 Mr. Knah got them in pools along a stream, in well-holes on a bare hill-top and 

 in a spring-hole full of algae. Mr. Jennings gives the following notes on his 

 observations in the Panama region : 



" It occurs abundantly from ocean to ocean but is somewhat more discriminat- 

 ing than the latter [Anopheles alhimanus'] in choice of breeding place. It pre- 

 fers as a rule water of greater purity and rapidity of current. The larval food, 

 like that of alhimanvs, is by preference the soft green algffi, though it does not 

 scorn, lacking better, many places departing quite widely from the chosen type. 

 At times the abundance is enormous, though usually far fewer of this species 

 will find their way into buildings than is the case with albtmanus, and its flight 

 is less vigorous." 



Semi-arid portions of the tropical and subtropical American continent ; south- 

 western United States to northern Argentina. 



Stanford University, California (I. McCracken) ; Stockton, California (H. 

 J. Quayle) ; Sweetwater Junction, California, June 3, 1906 (Dyar and Cau- 

 dell) ; Tia Juana, Baja California, Mexico, June 2, 1906 (Dyar and Caudell) ; 

 Las Vegas Hot Springs, Kew Mexico, 1902 (T. D. A. Cockerell) ; Devil's 

 Eiver, Texas, May 5, 1907 (P. C. Pratt) ; Brownsville, Texas, May 31, 1904 

 (H. S. Barber) ; Monterey, Mexico (McMean) ; Tampico, Mexico, September 

 3, 1903 (J. Goldberger) ; C6rdoba, Mexico, January 6, 1908 (F. Knah) ; Salina 

 Cruz, Mexico, July 9, 1905 (F. Knab) ; Eincon Antonio, Mexico, June 24, 

 1905 (F. Knab) ; Chiquimula, Guatemala, December 17, 1915 (R. Morales) ; 

 Bluefields, Nicaragua (W. F. Thornton) ; Port Limon, Costa Rica (R. L. 

 Turner) ; Tabernilla, Canal Zone, Panama, April 26, 1907 (A. Busck) ; Em- 

 pire, Canal Zone, Panama, May 6, 1907 (A. Busck) ; Culebra, Canal Zone, 

 Panama, May 7, 1907 (A. Busck) ; Rio Chagres, Panama, June 6, 1907 (A. 

 Busck) ; Las Cascadas, Canal Zone, Panama, June 8, 1907 (A. Busck) ; 

 Gatun, Canal Zone, Panama, June 8, 1907 (A. Busck) ; Pedro Miguel, Canal 

 Zone, Panama, November 18, 1907 (A. H. Jennings) ; Cartagenita, Paraiso 

 District, Canal Zone, Panama, November 16, 1907 (A. H. Jennings) ; Ancon, 

 Canal Zone, Panama, November 23, 1907 (A. H. Jennings) ; Bas Obispo, Canal 

 Zone, Panama, February 36, 1908 (A. H. Jennings) ; Matachin, Canal Zone, 

 Panama, February 36, 1908 (A. H. Jennings) ; Cocoli River, Canal Zone, 

 Panama, May 5, 1908 (A. H. Jennings) ; La Boca, Canal Zone, Panama (A. 

 H. Jennings) ; Taboga Island, Panama Bay, Panama (A. H. Jennings) ; Mira- 

 flores Barracks, Canal Zone, Panama, May 13, 1906 (A. H. Jennings) ; Santa 



