CTJLBX PILOSUS 393 



others short, each bearing a filament expanded near apex and terminating in a 

 sharp point. Clasp-filament rather large, contracted mesially, apex bent, with 

 a row of hairs along outer aspect and with a small terminal claw. Harpes with 

 a long, slender inner branch tipped by a row of teeth. Harpagones divided, one 

 branch with terminal teeth. Basal appendages long with enlarged setose tips. 



Larva, Stage IV (plate 106, fig. 355) . — Head rounded, broad, eyes prominent, 

 a large notch at insertion of antennae, front margin arcuate, slightly excavate 

 between clypeal spines. Antennae large, slightly curved, a large tuft at outer 

 third, apical portion slender; four long terminal setae and a long digit; basal 

 part of antenna spined on the outside. Upper pair of dorsal head-hairs small, 

 multiple, lower pair long, single; ante-antennal tufts multiple. Mental plate 

 triangular, with a stout central tooth and eight on each side, basal ones larger 

 and more remote, except last which is small. Mandible quadrangular, very 

 broad on outer margin, slightly pilose at base ; three long filaments and a tuft 

 of hairs before tip; an outer row of cilia; a row of small tufts from rounded 

 prominences within outer margin; dentition of four teeth on a short process 

 which lies in line with front margin, first and fourth equally long; two short 

 teeth at base, two filaments and a row of seven short feathered hairs within; 

 process below furcate, down-curved, with groups of hairs ; basal angle pointed ; 

 a row of hairs within ; a short row of basal hairs. Maxilla elongate, divided by a 

 suture ; inner half vnth rough irregularities on lower part of margin, a row of 

 fine cilia within, a jointed filament near suture; a row of long hairs at tip 

 running down the suture ; outer half with two filaments below middle. Palpus 

 very short, with four long slender digits in two pairs. Thorax rounded, wider 

 than long; abdomen moderate; skin coarsely hairy but not densely so; lateral 

 hairs in threes on first abdominal segment, in twos on second to fifth. Tracheal 

 tubes narrow. Air-tube slender, over seven times as long as wide, slightly 

 widened at base, outer half uniform ; pecten of long spines reaching over one- 

 third the length of tube, followed by five tufts in a line on posterior margin, the 

 outer ones somewhat shorter; single spine of pecten serrate, with about nine 

 equal branches. Lateral comb of eighth segment of many spines in a triangular 

 patch; single spine elongate, widened at tip, terminating in a row of spinules. 

 Anal segment nearly twice as long as wide, ringed by the plate ; dorsal tuft two 

 very long hairs and a small one on each side ; ventral brush well developed, con- 

 fined to the barred area. Anal gills small, not as long as the segment, rather 

 bluntly tipped. 



Mr. Busck obtained the larvae in a slowly running, clear, cold spring. 



Island of Santo Domingo, West Indies. 



San Francisco Mountains, September 3, 1905 (A. Busck). 



CULEX PILOSUS (Dyar & Knab). 

 Mochlostyrax pilosus Dyar & Knab, Journ. N. Y. Ent. Soc, xiv, 223, 224, 1906. 

 Obioinai. Desceiption of Mochlosttbax pilosus: 



The upper epistomal hair is double, the lower single, the anteantennal tuft of 

 four. Air tube straight along the front side, curved behind, the pecten not reaching 

 one-half, composed of long spines; eight hair tufts on the posterior edge, the two 

 within the pecten very long, the others shorter. Comb of the eighth segment of 15 

 thorn-shaped scales in a curved row. 



The specimens were collected by the junior author in Santa Lucrecia, Mexico, in 

 cattle tracks filled with water in the edge of a swamp. They have the habit of lying 

 on the back at the bottom. The adults were named " Melanoconion atratus Theob." 

 by Mr. Coquillett. 



The following is an abstract of the table : 



1. Antennae with the tuft from a notch beyond the middle 2 



2. Air tube not over four times as long as wide, stout at base and taper- 



ing, slightly curved forward with two stout hooks at tip . . . 4 

 4. Bars of comb in a curved row; body pilose pilosus 



