496 MOSQUITOES OF NOKTH AMERICA 



forming a long cylinder, reaching outer fourth of harpes, its inner revolute 

 margin notched towards tip. Basal appendages represented by a diffused 

 setose area. No spines on penultimate segment. 



The larvffi inhabit pools in stream-beds. Miss McCracken found occasional 

 specimens in San Francisquito Creek, which flows through the Palo Alto estate 

 near San Francisco, California. She says : " The stream begins to get sluggish 

 in the late spring or early summer, according to the season. Spirogyra and 

 other filamentous algae accumulate very rapidly. From the time these begin to 

 grow, throughout the summer, the two prevailing fresh-water forms, Guliseta 

 incidens and Culex tarscUis, are to be found breeding there. Here occasional 

 specimens [of Guliseta maccrachenoB] were found." She has found the larvae 

 also, fuUy grown, in a pasture trough as early as February 14 (1903) . It thus 

 appears that the species may take advantage of conditions produced by man. It 

 seems to be a rare species. 



Coast region of California. Stanford University, California, March, June, 

 1903 (Miss McCracken) ; Eureka, California, June 3 (H. S. Barber) ; Presidio, 

 San Francisco, California, July 4, 1906 (through C. S. Ludlow) . 



Guliseta maccrackeruB, with the following species (dugesi Dyar & Knab), 

 were formerly considered to be conspecific with the European Guliseta annulatus 

 Schrank ; both differ in the absence of the white ring at the middle of the first 

 tarsal joint, conspicuously present in that species, as well as in other details. 

 They are, however, very nearly related and represent that species in North 

 America. 



GULISETA DUGESI Dyar & Enab. 



Culex annulatus Osten Sacken (not Schrank), Biol. Centr. Amer., Ins., Dipt, i, 5, 



1886. 

 Culex annulatus WilUston (in part, not Schrank), TJ. S. Dept. Agr., Div. Omith. and 



Mammal., No. Am. Fauna. No. 7, 253, 1893. 

 Culex annulatus Sanchez (not Schrank), Dates para la Zool. mSd. mex., 135, 1893. 

 Culex annulatus Theobald (in part, not Schrank), Hon. Culic., 1, 331, 1901. 

 Culex annulatus Blanchard (in part, not Schrank), Les Moust., 280, 1905. 

 Guliseta dugesi Dyar & Knab, Proc. Bid. Sec. Wash., xix, 134, 1906. 

 Theobaldia annulata Theobald (in part, not Culex annulatus Schrank), Mon. Culic, 



V, 271, 1910. 

 Culiseta dugesi Theobald, Mon. Culic, v, 611, 1910. 



Obioinai, Descedption of Culiseta dugesi: 



Proboscis black with a few white scales; thorax with two brown stripes, the vesti- 

 ture yellowish over black. Wings with brown stains in the membrane where the 

 scales form small black patches on cell, on cross-vein and at bases of forked cells; 

 abdomen black with narrow white basal segmental bands, whitish scaled ventrally. 

 Legs black, sprinkled with whitish scales, the femora pale at base with a white ring 

 before the tip; tibiss with a line of white scales on each side; hind tarsal joints 

 banded with white at base for less than one-fourth their length. 



5 ?, Guanajuato, Mexico, January 20, 1905 (A. Dug^s) ; Mexico City, Mex., October 

 26, 1900 (S. Arara). 



Type—CaX. No. 9962, U. S. Nat. Mus. 



Desceiption of Female and Male of Culiseta duoesi (Labva Unknown) : 



Female. — Proboscis slender, uniform, labellse tapering; vestiture of black 

 scales, rather sparsely intermixed with white ones, setas small, curved, somewhat 

 more outstanding on labellse. Palpi about one-fourth as long as proboscis; 

 scales black, flat, appressed, a few white ones scattered, especially at tip and at 

 base of long joint; rather numerous black outstanding setae near base. An- 

 tennae moderate, the joints subequal, densely clothed with brown cilia; tori 

 globose, ochraceous, brown within; hairs of whorls sparse, rather short, witii a 

 whitish luster. Clypeus rounded triangular, nude, light brown. Occiput dark 

 brown, clotiied with narrow, curved whitish scales and black upright forked 



