424 MOSQUITOES OF NOKTH AMERICA 



to C6rdoba, Mr. Knab found only one larva of this species, and was unable to 

 rear it. The larvae were comparatively few in numbers and were associated with 

 many larvae of Culex coronator, a few of Anopheles, and one of Lutzia higotii. 

 The species appears to have a seasonal occurrence. The pools are flooded during 

 high water and must be pretty thoroughly scoured out during freshets, such as 

 occur in the locality in question. 



Mexico. 



Cordoba, June 11, 1905 (P. Knab). 



CXILEX BASTAGARIUS Dyar & Knab. 

 Culex tastagarius Dyar & Knab, Proc. Biol. Soc. Wash., xix, 170, 1906. 

 Obigiwai. Descbiption of Ctjiex bastagabius : 



Very close to C. mutator Dyar & Knab, described from Cordoba, Mexico. The 

 larvae differ slightly. In mutator the whole body is densely hairy, the upper head 

 tuft is of three rather long hairs and two of the apical antennal spines are well re- 

 moved from the tip ( Journ. N. Y. Bnt. Soc., xiv, pi. x, lig. 42, 1906) ; in iastagarius 

 the thorax only is hairy, the abdomen glabrous, the upper head tuft is of four hairs 

 and very small, the four antennal spines are close together at apex. 



The adults of mutator were named " Melanoconion hum,ilis Theobald " by Mr. 

 Coquillett. Culex humilis Theobald (Mon. Culic, ii, 336, 1901), was described from 

 Sao Paulo, Brazil. We have seen neither adults nor larvse from Brazil, and, though 

 Theobald's description, as far as it goes, applies to our specimen's, the occurrence of 

 closely allied forms in Mexico and Trinidad, prevent us from accepting the name for 

 the form before us. 



G. mutator and C. J>astagarius are practically identical in markings (and agree 

 with Theobald's description of humilis), but in mutator the upper branch of the 

 fifth vein ((?) has the scales narrowly linear and outstanding, while in iastagarius 

 they are narrowly obovate, grading into those of the veins above. 



One male, bred from larvse In small grassy pools as Laventille, Trinidad, by Mr. 

 F. W. Urich. Two other males are in the collection, bred by Mr. A. Busck from un- 

 isolated larvae at Arima, Trinidad. 



Type.—Ca.t. No. 10,018, U. S. Nat. Mus. 



Descbiption of Male and Labva of Cttles bastagabitts (Female Unknown) : 



Male. — Proboscis long and slender, moderately swollen at tip, clothed with 

 bronzy-black scales. Palpi long and slender, exceeding the proboscis by nearly 

 the length of the last two joints, which, with the end of the long joint, are 

 slightly thickened and clothed with long black hairs ; vestiture bronzy brown. 

 Antennae rather long, densely plumose, hairs of whorls very long. Occiput 

 dark brown, clothed with bronzy-brown scales with a gray luster in some lights, 

 a few narrow, curved ones on the nape, the others broad and flat, many semi- 

 erect, bronzy-brown to golden forked scales ; cheeks white scaled. 



Mesonotum deep brown, clothed with narrow, curved, pale golden-brown 

 scales, setae rather sparse, but coarse and long, black. Scutellum trilobate, with 

 a group of long setae on each lobe, scales simUar to those of mesonotum. Post- 

 notum olive brown, nude. Pleurae dark, coxae light green, with patches of 

 elliptical, flat white scales and rows of short brown bristies. 



Abdomen slender at base, posterior portion depressed and somewhat broad- 

 ened; vestiture above deep bronzy brown, black in some lights, with white basal 

 bands, first segment unhanded, on second and third segments the bands are 

 nearly obsolete, on fifth and sixth segments reduced to lateral spots; venter 

 dark, with broad, basal, pale segmental bands ; lateral ciliation coarse and very 

 long, brown. 



Wings rather narrow, vestiture of pale brown scales; scales of veins more 

 dense and ovate on forks of second and fourth veins, outer half of third and 

 apex of upper branch of fifth ; petiole of second marginal cell one-fourth as long 

 as its cell, that of second posterior cell somewhat shorter than its cell ; basal 

 cross-vein about twice its own length from anterior cross-vein. 



