BITING MIDGES — WIRTH AND BLANTON 407 



Dari^in Province: Garachin^, Jaque, Punta Patino. 



Herrera Province: Ocu, Puerto Chitre. 



Los Santos Province: Guarar^, La Palma, Pena Blanca, Puerto Mensab^, Rio 



Estiband, San Jose, Santo Domingo. 

 Panama Province: Arraijdn, Bayano, Camar6n, Capitana, Chepo, El Espino, 



La JoUa, Pacora, Panamd Vieja, Pedregal, Rio Las Lajas, San Carlos, Tocumen, 



Viqu6 Cove. 

 Veraguas Province: Divisa. 

 Archipi^lago de las Perlas: Isla del Rey. 



Discussion: Except for the differences in the tip of the aedeagus, 

 this widely distributed and abundant salt marsh species is fairly 

 constant in its characters. Males from the United States, Bahamas, 

 and from most of the Panama localities have the lateral apical points 

 of the aedeagus lacking, while males from Trinidad and from Agua- 

 dulce, Garachine, Puerto Mensabe, and Tocumen and part of the 

 series from Rio Hato have these points well developed. The latter 

 form might well prove to be a subspecies for which the name maculi- 

 thorax (Williston) is available, but a distributional study of males 

 from many Caribbean localities would be necessary to establish this 

 relationship. 



The fiuvialis group 



This group consists of small to medium-sized species with prominent 

 mesonotal pattern, wing pattern usually of definite small pale spots, 

 vein Ml pale-margined distally or the apices of veins Mj, M2 and some- 

 times M3+4 pale; female antenna with sensoria present on segments 

 III, VII or VIII to X and rarely to xi or xiv; four tibial spines ; one or two 

 spermathecae; male genitalia with ventral root of basistyle foot- 

 shaped, paramere with simple basal knob, stem short, with or without 

 ventral lobe, the apex fringed or simple; aedeagus usually with simple 



tip. 



Panama species: Six: balsapambensis Ortiz and heon, castillae Fox, 

 fiuvialis Macfie, leopoldoi Ortiz, propriipennis Macfie, and tetrathyris, 

 new species. 



60. Culicoides fiuvialis Macfie 



Figure 63 



Culicoides fiuvialis Macfie, 1940, Ent. Monthly Mag., vol. 76, p. 75 (female; 

 British Guiana; fig. wing). — Ortiz, 1951, Nov. Cient. Mus. Hist. Nat. LaSalle, 

 zool. ser., no. 5, p. 2 (female; Venezuela; fig. wing, palpus, spermathecae); 

 1952, Rev. Sanid. Asist. Soc, vol. 17, p. 264 (male; Venezuela; fig. wing, 

 palpus, genitalia, fig. female wing). 



Female: Length of wing 0.76 (0.73-0.79, n=10) mm. 



Head. — Eyes narrowly separated, bare. Antenna with flagellar 

 segments in proportion of 15:11:11:11:11:12:12:12:17:18:18:19:29, 

 antennal ratio 1.07 (1.05-1.11, n=6); distal sensory tufts present on 



