1038 MOSQUITOES OP NOKTH AMERICA 



filaments above, two within ; a quadrate process at end of dentition, a slender one 

 at base; a row of setse outwardly, the inner ones longest. Maxilla rounded 

 rectangular, palpus attached perpendicularly by a pseudoarticulation ; numerous 

 hairs and divided filaments on inner aspect ; palpus angled at base, short, not 

 longer than the maxilla, a row of short spines on inner aspect, four terminal 

 digits and two small hair-tufts. Thorax rounded quadrate, about as long as 

 wide; hairs short, consisting of feathered hairs and a few short simple ones, 

 mesothorax sparsely haired. Abdomen moderate, anterior segments short ; long, 

 feathered lateral hairs, double on first two segments, single on third to sixth ; a 

 dorsal series of four pairs of fan-shaped tufts on third to sixth segments (plate 

 130, fig. 463). Air-tube sessile, subquadrate, roimdedly angled posteriorly. 

 Lateral plates of eighth segment posteriorly with a series of long spines without 

 any shorter ones between. Anal segment about as long as wide, with a dorsal 

 plate finely spined behind ; dorsal brush of two tufts on each side ; ventral brush 

 well developed, of long branched tufts. Anal gills moderate, about as long as the 

 segment, slightly tapered, blunt pointed^^ 



Egg. — Short fusiform, strongly tapered toward both ends, black, the surface 

 finely granulate ; float consisting of a thin membrane which entirely covers the 

 dorsal surface (in normal position of egg upon the water) and projects as a 

 narrow rim along the entire margin, this rim very narrow and crenulate at the 

 ends, broader at the sides and with a series of numerous impressed transverse 

 lines. 



The eggs were obtained from captured females by Mr. Barber ; they are laid 

 separately upon the surface of the water. The larvae are foimd only in water 

 in tree-holes, in company with larvEE of Aedes triseriattis and Orthopodomyia 

 signifer and also with Megarhinvs septentrionalis. The larvae probably feed 

 normally upon small organisms, but have been observed to devour other mos- 

 quito larvae with which they were associated. Dr. Dyar obtained small larvae 

 late in the fall, which failed to mature before winter. It is possible that the 

 larvae hibernate, but the hibernation may be normally as adult. This species 

 occurs, with other mosquitoes breeding in tree-holes, in forested regions, often 

 when the country is so dry that no other mosquitoes are found. 



Eastern United States. 



Plummer's Island, Maryland, August 17, 1905 (H. S. Barber) ; Cabin John, 

 Maryland, October, 1908 (P. Knab) ; Bluemont, Virginia, July 29, 1904 (F. 

 C. Pratt) ; Woodstock, Virginia, August 9, 1904 (F. C. Pratt) ; Tryon, North 

 Carolina (H. G. Dyar) ; Columbia, South Carolina, August 1, 1906 (A. C. 

 Moore) ; St. Louis, Missouri, August, 1904 (A. Busck) ; Agricultural College, 

 Mississippi, October 15, 1905 (G. W. Herrick) ; Scott, Arkansas, October 2, 

 ] 908 (J. K. Thibault, Jr.) . Eeported also from New Jersey (Smith) . 



Ceslodiazesis barberi has recently been placed by Major Christophers of India 

 in the synonymy of the European 0. plumbeus (Stephens).* This latter has 

 been generally treated under Staeger's later name. Anopheles nigripes. We 

 have for some time considered this synonymy as highly probable, but in the 

 absence of European material for comparison we prefer to treat the American 

 form as distinct. Major Christophers also includes in the synonymy Ocslodia- 

 zesis barianensis (James), from the Himalayas, but his description of this last 

 shows that it is abundantly distinct. Among other characters, he states that 

 the mesonotum has " in the centre a line of white scales (plume-like str. 6) 

 extending from the anterior promontory about half way to the level of the origin 

 of the wings." No such scales exist in our species. The larva has five pairs of 

 abdominal fan-shaped tufts, while barberi has but four. It appears that Ccelo- 

 diazesis barberi has been identified by Theobald and others as the European 

 Anopheles bifurcatus (L.) and C. plumbeus; from the former it is, of course, 

 amply distinct, the chief resemblance being the unspotted and uniformly sealed 

 wings. 



• Indian Jouru. Med. Res., Ill, 490, 1916. 



