PSOEOPHORA VIRESCENS 541 



processes near tip. Palpus broadly attached, not more than half as long as 

 maxilla ; terminal digits minute. Thorax rounded, about as wide as long; hairs 

 slight. Abdomen stout, segments transverse; lateral hairs multiple on first 

 two segments, triple on third, single on fourth to sixth. Tracheal tubes broad, 

 band-shaped. Air-tube. stout, conically tapered outwardly, over three times as 

 long as wide; pecten reaching to outer fifth of tube, beginning basally before 

 chitinized part ; single tooth a quadrangular scale with excavate base and trifid 

 apex, one branch produced into a long hair ; a long hair-tuft almost at apex of 

 tube, well beyond pecten. Lateral comb of eighth segment, a long, curved row 

 of scales preceded by a large area of minute scales; single scale elliptical with 

 five stout apical spines, the central one twice as long as subapical one. Anal 

 segment longer than wide, ringed by the plate ; dorsal tuft a long hair and brush 

 on each side ; a single lateral hair ; ventral brush a series of tufts running the 

 whole length of ventral line, puncturing the chitinized ring. Anal gills very 

 long, longer than the segment, regularly tapered to a sharp tip. 



Mr. Knab found the larvas in a large pond choked by vegetation in the forest 

 beyond the settlement. The pond contained numerous other mosquito larvae, 

 species of A edes and Janthinosoma, on which the Psorophora cilipes were feed- 

 ing. This was the only place where this species occurred. Temporary pools in 

 the vicinity contained Psorophora virescens, but not this species. The living 

 larva is darker in color than that of P. virescens. Mr. Busck found the larvas in 

 numbers " in a newly flooded meadow covered with bushes and tall grass. They 

 were preying upon the larvae of Culex lactator [ = corniger Theob.] and Jan- 

 thinosoma posticata, which were very abundant in these temporary pools." 



Tropical America ; Sao Paulo, Brazil, to Costa Rica. 



Las Loras, near Puntarenas, Costa Rica, September, 1905 (F. Knab) ; Las 

 Cascadas, Canal Zone, Panama, May 15, 1907 (A. Busck) ; Tabemilla, Canal 

 Zone, Panama, August 24, 30, 1908 (A. H. Jennings) ; Gatun, Canal Zone, 

 Panama (A. H. Jennings) ; Siparuni Creek, Essequibo River, British Guiana 

 (K. S. Wise) ; City of Para, Brazil (C. F. Baker). The species has been re- 

 ported also from Trinidad (Theobald) ; Sao Paulo, city of Rio de Janeiro, Juiz 

 de Fora in Minas Geraes, Brazil (Peryassu). 



Psorophora cilipes is related to P. soeva; Mr. Coquillett included both under 

 the determination " Psorophora cilipes Fab.'' The adults of P. cilipes are easily 

 recognized by the iridescent, strongly outstanding, nearly erect scales of the 

 legs ; these scales are broad, truncate and of different shapes and lengths, some 

 with long slender stalks, which gives the legs a characteristic shaggy appear- 

 ance. The larvae also differ to a marked degree. Our identification is based 

 on the comparison of specimens with the type of Fabricius, in the Zoological 

 Museum at Copenhagen, by Dr. Arthur Neiva. 



PSOROPHORA VIRESCENS Dyar & Knab. 



Psorophora scintillans Parker, Beyer & Pothier (not Walker), Bull. 13, Yell. Fever 

 Inst, U. S. Publ. Health & Marine-Hosp. Serv., 41, 1903. 



Psorophora howardii Dyar & Knab (in part, not Coquillett), Journ. N. Y. Ent. Soc, 

 xiv, 180, 1906. 



Psorophora virescens Dyar & Knab, Proc. Biol. Soc. Wash., xix, 133, 1906. 



Psorophora howardii Coquillett (in part, not Coquillett), U. S. Dept. Agr., Bur. Ent., 

 Tech. Ser. 11, 14, 1906. 



Psorophora virescens Theobald, Mon. Culic, v, 605, 1910. 



Original Description of Psorophora virescens : 



Close to P. howardii Coquillett, but the abdomen above metallic green shining in- 

 stead of blue. The species is also somewhat smaller. 



35 specimens, Almoloya, Acapulco, Tehuantepec, Salina Cruz, Mexico; Puntarenas, 

 Costa Rica (F. Knab) ; Manzanillo, Mexico (A. Duges) ; Monterey, Mexico (J. Gold- 

 berger). 



Type.Csd. No. 9966, U. S. Nat. Mus. 



