H^MAGOGUS SPLENDENS 867 



first long, the others appearing as rounded irregularities on its lower declivity ; 

 two long spines before, a furcate tooth at base, a row of serrate filaments within ; 

 process below widely furcate, the upper fork curved and erect, setose; five 

 filamentous hairs within ; a row of long hairs at base. Maxilla elongate, divided 

 by a narrow suture; a row of stout spines on inner margin, and two lines of 

 cilia ; a linear tuft of long hairs at tip, bent backwards toward base ; outer half 

 with two subapical filaments near the suture and a spine on the other side ; two 

 rows of fine cilia ; palpus rather long, projecting as far as maxilla, with two long 

 and two short apical digits. Skin of body smooth. Thorax rounded, wider than 

 long; hairs abundant, well tufted, the subdorsal prothoracic ones multiple. 

 Abdomen slender, uniform, the anterior segments shorter ; lateral tufts multiple 

 on first segment, triple on second, double on third to sixth, single on seventh, 

 all rather long; secondary hairs well developed; tracheal tubes broad, band- 

 shaped, flexuous, wider in the air-tube. Air-tube stout, conically tapered on 

 outer third, two and a half times as long as wide ; pecten evenly spaced, running 

 to middle, followed by a single tuft of four hairs ; single pecten-tooth a long 

 spine with a stout basal tooth. Lateral comb of eighth segment of many small 

 scales in a triangular patch; single scale broad, rounded, evenly fringed with 

 spinules. Anal segment longer than wide, with a dorsal plate reaching halfway 

 down the sides, spined on posterior edge ; dorsal tuft a long hair and brush on 

 each side ; a lateral three-haired tuft at angle of plate ; ventral brush well de- 

 veloped, with some small preceding tufts; a little triangular plate on either 

 side of barred area; anal gills very short, less than half as long as the segment, 

 lower pair much smaller, not half as long as upper pair. 



Mr. Knab found the larvge in water in cacao-husks on the ground and in an 

 old kerosene-can half filled with dirt and rubbish near a deserted house. Mr. 

 Urich got them in a hollow tree. Mr. Busck got them in bamboo-joints and in 

 tree-holes. Mr. Jennings found them mostly in tree-holes, but on several occa- 

 sions in salt water in holes in rocks on the sea shore (Caldera Island, Panama). 

 The larvse evidently normally inhabit hollow trees, occasionally having recourse 

 to artificial receptacles ; their occurrence in rock-holes is less usual and is de- 

 cidedly unexpected. The larvae take a considerable time to mature ; Mr. Knab 

 was able to bring live larvae from Costa Rica to Washington. 



Tropical regions of America, exclusive of the Greater Antilles. 



Bluefields, Nicaragua (W. F. Thornton) ; Port Limon, Costa Rica, September 

 28, 1905 (F. Knab) ; Zent, Costa Rica, September 26, 1905 (F. Knab) ; Lion 

 Hill, Canal Zone, Panama (A. Busck) ; Tabernilla, Canal Zone, Panama, June 

 4, 1907 (A. Busck), April 14, 1909 (A. H. Jennings) ; Chagres River, Panama, 

 May 20, 1907 (A. Busck) ; Caldera Island, Porto Bello Bay, Panama, January 

 4, 1908, February 14, 1909 (A. H. Jennings) ; Ancon, Canal Zone, Panama, 

 July 1, 1908 (A. H. Jennings) ; Miraflores, Canal Zone, Panama, May 9, 1908 

 (A. H. Jennings) ; Bas Obispo, Canal Zone, Panama, July 16, 1908 (A. H. 

 Jennings) ; Panama City, Panama (A. H. Jennings) ; San Juan, Trinidad 

 (F. W. Urich). Reported also from St. Vincent, West Indies (Williston) ; 

 British Guiana (Theobald) ; Para (Theobald), States of Minas Geraes and Sao 

 Paulo (Peryassu), Brazil. 



Hcemagogus splendens was identified by Theobald in 1901 with Culex cyaneus 

 Fabricius. The type of Culex cyaneus is in the Copenhagen Museum and has 

 been examined by Mr. Busck and Dr. Boving, from whose observations we 

 have concluded that it is really a Sahethes and it has been so treated on page 26 

 of this work. The types of Hmnagogus splendens are in the British Museum 

 and Mr. Edwards has observed setae upon the postnotum of these specimens. 

 These setae are minute and not easily detected and were overlooked by us, with 

 the result that we considered our material a distinct species for which we pro- 

 posed the name Stegoconops lucifer. Careful re-examination of our material 



