382 MOSQUITOES OF NOETH AMERICA 



before tip; an outer row of cilia from a collar; a row of rounded transverse 

 prominences within outer margin bearing long hair-tufts ; dentition of four 

 irregular teeth, scarcely elevated on a process; a spine before, a long smooth 

 filament and small row of feathered hairs within; process below obscurely 

 furcate, with a transverse and longitudinal row of hairs and slight terminal 

 tufts ; basal angle rather small, with a row of stout hairs within and two sepa- 

 rated hairs below; a basal row of long hairs. Maxilla elongate, conical, divided 

 by a suture ; inner half with long spines on margin mixed with short stiff hairs, 

 a row of cilia near suture basally ; a row of long hairs at tip continued along 

 suture ; outer half with two filaments at basal third next suture and a single 

 one on other side of suture at apical third. Palpus very small with four long 

 slender digits. Thorax rounded, wider than long. Abdomen moderate, anterior 

 segments shorter ; lateral hairs in threes on first segment, in twos on second to 

 fifth, in threes on sixth; skin pilose. Air-tube long, rather wide at base and 

 tapering to near the apex, nearly six times as long as wide; pecten long, 

 reaching basal two-fifths ; single teeth broad with numerous serrations on one 

 side ; five short multiple nearly equal tufts on posterior margin beyond pecten ; 

 apical hooks large, each with a tooth. Lateral comb of eighth segment of many 

 spines in a triangular patch ; single spine elongate, a little Avidened at tip, with 

 apical fringe of spinules. Anal segment nearly twice as long as wide, ringed 

 by the plate; dorsal tuft a pair of long hairs and a short one on each side ; ven- 

 tral brush moderate, confined to the barred area. Anal gills rather short, not 

 as long as the segment, uniformly tapered. 



The larvae live in ground-pools. Mr. Knab obtained them from a reedy pool 

 beside a railroad track. 



Mexico. 



Santa Lucrecia, June 20, 1905 (F. Knab). 



We have been unable to find the adults bred from these larvae ; the specimens 

 must have been lost or destroyed before they were examined. We have not met 

 with the species again. 



CULEX ERRATICUS (Dyar & Knab). 



Melanoconion atratus Dyar (not Theobald), Journ. N. Y. Ent. Soc, xiii, 26. 29, 1905. 

 MocTilostyrax erraticus Dyar & Knab, Journ. N. Y. Ent. Soc, xiv, 223, 224, 1906. 

 Melanoconion atratus Coquillett (in part, not Theobald), U. S. Dept. Agr., Bur. Ent., 



Tech. ser. 11, 24, 1906. 

 MocTilostyrax erraticus Dyar, U. S. Dept. Agr., Bur. Ent., Circular 72, 3, 1906. 



Original Description of Mochlosttrax erraticus : 



The larva resembles that of Culex salinarhis. The skin is densely covered with 

 minute spiculse, making it appear pilose. The air tube is long and straight, about six 

 times as long as wide, has the pecten small, running to the basal third, followed by 

 five moderate tufts on the posterior edge and two very short dorsal ones. The lateral 

 comb of the eighth segment has the spines in a rather irregular row, not in the 

 normal perfectly straight line, yet not doubled. We have the species from Dr. 

 Dupree, Baton Rouge, Louisiana. It was identified as " Melanoconion atratus Theob." 

 by Mr. Coquillett, but of course erroneously. 



The following is an abstract of the table : 



1. Antennae with tuft from a notch beyond middle 2 



2. Air tube over four times as long as wide, slender, scarcely tapered, 



with slight terminal setae 3 



3. Bars of comb in an irregular row, body pilose erraticus 



Description of Female and Larva of Culex erraticus (Male Unknown) : 



Female. Proboscis rather long, apical third moderately thickened, clothed 

 with blackish scales. Palpi short, rather stout, a1:)0ut one-sixth as long as the 

 proboscis, clothed with brown scales. Antenna? rather long, segments subequal, 

 somewhat stouter than usual, rugose, pilose, black, the whorls of a few long 



