588 MOSQUITOES OP NORTH AMEEICa 



Larva, Stage IV (plate 115, fig. 393). — Head transverse, rounded, widest 

 through eyes; antennae long, stout, nearly uniform, spinose, a moderate tuft at 

 middle ; upper pair of dorsal head-hairs iu fives, lower in threes, ante-antennal 

 tuft multiple. Lateral comb of eighth segment of six to eight scales on a weak 

 chitinous plate; single scale with small spines on angles and a long central 

 point. Air-tube inflated, fusiform, about four times as long as basal diameter ; 

 pecten of five widely spaced teeth, the small hair-tuft at apical third of tube. 

 Anal segment longer than wide, ringed by a chitinous band ; dorsal tuft a long 

 hair and multiple tuft on each side; ventral brush running along ventral line 

 almost to base. Anal gills long, slender, tapering, equal. 



The larvae live in temporary ground-puddles. Dr. Dyar found them especially 

 abundant in puddles without vegetation, such as new railroad ditches or exca- 

 vations caused by digging in clay ground. In such situations they were often 

 the only mosquito larvae present. Although this species was very common, no 

 specimens were taken attempting to bite. It seems probable that the adults do 

 not bite man, at least habitually. Dr. Bryd found the larvas in a small stream in 

 the city. 



Florida. 



Tampa, March 18, 1905 (H. G. Dyar) ; Kissimmee, March 19, 1905 (H. G. 

 Dyar) ; Sanford, March 17, 1905 (Dyar & Caudell) ; Alligator Creek, March 

 18, 1905 (A. N. Caudell) ; Pokatee, March 19, 1905 (A. N. Caudell) ; Arcadia, 

 March 19, 1905 (A. N. Caudell) ; Bartow, March 20, 1905 (A. N. Caudell) ; 

 Estero, August 16, 1906 (J. B. van Duzee) ; Jacksonville, July 2, 1906 (H. 

 Byrd). 



Psorophora floridense has been occasionally confused with the more northerly 

 distributed Psorophora columbice. 



PSOROPHORA TOLTECUM (Dyai & Enab). 



Twniorhynchus perturbans Parker, Beyer & Pothier (not Walker), Yell. Fever Inst, 



Bull. 13, 37, 38, 1903. 

 Janthinosoma jamaicensis Dyar & Knab (In part, not Theobald), Journ. N. Y. Ent, 



Soc, xlv, 183, 1906. 

 Janthinosoma toltecum Dyar & Knab, Proc. Biol. Soc. Wash., xix, 135, 1906. 

 Janthinosoma toltecum Theobald, Mon. Culic, v, 604, 1910. 



Oeiginai, Desceiption of Janthinosoma toltbctjm: 



As in J. floridense Dyar & Knab, but the pale abdominal bands are extensive, 

 broken only on the last segments; the scales on the scutellum have a silvery luster. 



89 specimens, Tehuantepec, Sallna Cruz, Rlncon Antonio, Santa Lucrecia, Almo- 

 loya, Mexico (F. Knab) ; Vera Cruz, Mexico (G. E. Beyer) ; Dallas, Texas, September 

 14 (W. E. Hinds). 



Type.— Cat. No. 9973, U. S. Nat Mus. 



Desceiption or Femam;, Male, and Laeva or Psokophoka toltecum : 



Female. — Proboscis rather short, subcylindrical, uniform, labellae conically 

 tapered; vestiture of small black scales at base and apex, the middle half yel- 

 lowish white, the edges of this pale area diffused; setae small, curved, black, 

 those on labellae more prominently outstanding. Palpi short and stout, about 

 one-fourth as long as proboscis, black scaled, with white tips ; setae rather long 

 and black. Antennae moderate; basal joints short, distal ones longer, rugose, 

 pilose, black, four basal ones paler ; tori subspherical, with a cup-shaped apical 

 depression, brown, a patch of white scales within ; hairs of whorls sparse, short, 

 black. Clypeus elliptical, prominent, dark brown, nude. Eyes black. Occiput 

 narrow, convex, blackish, clothed with narrow, curved white scales and many 

 slender, erect, forked, deep brown ones, a patch of broad, flat brown scales 

 laterally at eye-margin, the white scales below dense, broad and flat ; setae along 

 margins of eyes numerous, brown. 



