CULEX INVESTIGATOR 381 



July to October." Later Mr. Thibault published the statement that this species 

 " breeds in permanent bodies of water, preferring those thickly overgrown with 

 aquatic plants." He states that the males are generally in evidence after 

 June 10. 



Mr. Coad has found the larvse abundant under the conditions last described 

 on the lower Illinois Eiver. Eecently he has published the f oUowing data on the 

 eggs and the habits of the larvse. The aquatic vegetation is composed of Gerctr 

 tophyllum, Potamogeton, Lemna and other plants; this growth is more or less 

 impervious to fish, while it still leaves sufficient space for the mosquito larvse. 

 The eggs " are laid on the upper surface of Lemna fronds in rather large masses. 

 In only one instance were the eggs found .... on the edge of a Potamogeton 

 leaf which was floating on the water. They are quite firmly attached to the 

 frond and to each other. The base of the egg is truncate, facilitating a firm 

 attachment. The eggs are very black. . . . They are always near the margin 

 of the frond and, upon hatching, the young larvae immediately wriggle off into 

 the water." It appears from Mr. Goad's figure, that there are about 90 eggs in 

 a mass, arranged in about six rows. 



Southern Mississippi Valley. 



Tutwiler, Mississippi, August 2, 1904 (H. S. Barber) ; Eives, Tennessee, July 

 27 (H. S. Barber) ; Victoria, Texas, July 28, 1904 (E. G. Hinds) ; Piano, 

 Texas, September (E. S. Tucker) ; Como, Franklin Parish, Louisiana, August 

 20, 1901 (G. E. Beyer) ; Scott, Arkansas, October 8, 1908 (J. K. Thibault, Jr.) ; 

 Scott, Lonoke County, Arkansas, August 11, 1909 (J. K. Thibault, Jr.) ; 

 Havana, Illinois (B. K. Coad). 



CULEX INVESTIGATOR Dyar & Knab. 



Culex investigator Dyar & Knab, Journ. N. Y. Ent. Sec, xiv, 207, 216, 1906. 

 OBiortfAL Desceiption of Cuuex investigatob : 



Antennae with the tuft slightly beyond the middle, dark; head hairs single; body 

 pilose; lateral hairs in twos after the first abdominal segment. Air tube five-and-a- 

 half times as long as wide, rather markedly tapered on basal third; pecten of long 

 teeth, reaching two-fifths, followed by five rather short hair tufts. 



Taken by the junior author in a pool beside the railroad track, three miles from 

 town, Santa Luerecia, Mexico. Mr. Coquillett seems not to have named the adult 

 although one was bred. 



The following is an abstract of the table : 



1. Antennae with the 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 the 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 long, well-defined tufts 20 



20. Body spicular-pilose 21 



21. Five tufts on posterior margin of tube subequal in length, short; 



lateral abdominal hairs in twos on segments 3 to 5 22 



22. Air tube 6X1; upper head hair single; pecten long investigator 



DeSCBIPTION of LAEVA of Ct/^X INVESTIGATOB (AdTTLT UNKNOWN) '. 



Larva, Stage IV (plate u.05, fig. 351). — Head large, broad, rounded, widest 

 through eyes, bulging on mdes, a large notch at insertion of antennae, front 

 margin arcuate. Antennae large, curved, thick and spined on basal two-thirds, 

 with a large tuft from a notch; two long subapical setae, a long seta, a short 

 one and a digit at tip. Upker pair of dorsal head-hairs small, in fours, lower 

 pair long, single ; ante-anfennal tuft multiple. Mental plate triangular, straight 

 on sides, with a large central tooth and five on each side, basal two a little more 

 remotely spaced. Mandible quadrangular; three filaments and a tuft of hairs 



