424 MOSQUITOES OF NORTH AMERICA 



to Cordoba, 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 bigotii. 

 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 (F. Knab). 



CULEX BASTAGARIUS Dyar & Knab. 



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



Original Description of Ctjlex bastagarius : 



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

 larvae dilTer 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. Ent. Soc, xiv, pi. x, tig. 42, 1906) ; in bastagarius 

 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 humilis Theobald " by Mr. 

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

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

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

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

 the form before us. 



C. mutator and C. bastagarius 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 bastagarius 

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



One male, bred from larvae 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. Cat. No. 10,018, U. S. Nat. Mus. 



Description of Male and Larva of Culex bastagarius (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 broM'n, 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, setfe rather sparse, but coarse and long, black. Scutellum trilobate, with 

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

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

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



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. 



