CULEX INIMITABILIS 449 



plate small, triangular, with a large, stout central tooth and six on each side, 

 two basal ones larger. Mandible quadrangular; three long filaments and two 

 short ones before tip ; a row of small transverse rounded prominences on outer 

 margin, each bearing a tuft of fine hairs ; dentition of two large teeth with a 

 small one between and a group of short spines below; a spine before, a long 

 smooth filament and row of feathered hairs within; a process below obscurely 

 furcate, with a row of hairs outwardly and a tuft at tip of each limb; basal angle 

 small, with a row of stifE hairs within, the two outermost of which are feathered ; 

 a basal row of hairs. Maxilla much elongated, the apex flatly rounded and con- 

 sisting entirely of the outer half, a suture separating the two halves ; inner half 

 with a row of long spines on margin, the basal ones serrate; two rows of cilia 

 within; a stout articulated spine next the suture; a row of long hairs at tip 

 running down along the suture ; outer half with two filaments at basal third and 

 a few hairs within. Palpus very small, with four long straight apical digits. 

 Thorax rounded, wider than long; lateral abdominal hairs in threes on third 

 to sixth segments ; tracheal tubes narrow, angulated within the segments ; skin 

 glabrous. Air-tube long, straight, gradually tapered, about six and a half times 

 as long as wide; pecten of long teeth, reaching nearly one-third, single teeth 

 coarsely serrate on one side ; five large tufts on posterior margin beyond pecten, 

 shortening progressively towards tip. Lateral comb of eighth segment of many 

 spines in a large triangular patch; single spine elongate, widened at tip, with an 

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

 by the plate ; dorsal tuft of two long hairs and a short one on each side ; ventral 

 brush well developed, confined to the barred area. Anal gills shorter than the 

 segment, tapered. 



The larvae live in the water between the leaves of Bromeliacea. 



Mexico. 



Cordoba, June 14, 1905, and December 23, 1907 (F. Knab). 



This species is especially difficult to rear, and Mr. Knab obtained no adults 

 on his first visit to Cordoba. On his second visit he was able to find but very few 

 larvse, and the conditions were therefore still less favorable for obtaining adults 

 than before. The adult is, therefore, still unknown. 



CULEX INIMITABILIS Dyar & Knab. 

 Culex inimitaUlis Dyar & Knab, Journ. N. Y. Ent. Sec, xiv, 208, 221, 1906. 

 Original Desceiption of CuXjEX inimitabtt.ts : 



Collected in Bromelia water by Mr. TJrlch in Trinidad with O. dautnasturua, wblch 

 it resembles, but lacks the swelling on the tube. The body is smooth; the lateral 

 hairs are in threes on the first segment, twos on the second, threes and short on the 

 third to fifth, twos and long on the sixth. It was named " Culex f pipiens L.," by Mr. 

 Coquillett; rather a worse guess than usual. 



The following is an abstract of the table : 



1. Antennae with tuft outwardly placed, the part beyond slender 5 



5. Air tube four times as long as wide or over 7 



7. Anal appendages four, normal 8 



8. Air tube with four to ten paired tufts along posterior line in a 



straight row, none displaced, or the hairs obsolete or absent. 18 



18. Air tube without a crown of spikes, smooth throughout 19 



19. Air tube with small double or single hairs, or bare 31 



31. Air tube uniform without any swelling 32 



32. Air tube with single hairs or bare 37 



37. Pecten of air tube of five teeth, the last two long and remote, on 



basal one-seventh of the tube inimitabiUs 



29 



