BITING MIDGES — WIRTH AND BLANTON 411 



of anal cell, only one pale spot in distal portion of cell M2, a pale spot 

 behind medial fork and another in front of mediocubital fork, ends of 

 veins Mi, M2 and M3+4 with pale spot at wing margin. Macrotrichia 

 sparse on distal fourth of wing; costa extending to 0.70 of distance to 

 wing tip. Halter pale. 



Abdomen. — Blackish, cerci yellowish. Spermathecae two, sub- 

 equal, pyriform, each measuring 0.045 by 0.030 mm. 



Male genitalia: Ninth sternum with small but distinct caudo- 

 median excavation; ninth tergum tapering, the apicolateral processes 

 moderately long with slender points. Basistyle with ventral and 

 dorsal roots of subequal lengths, the ventral root foot-shaped with 

 distinct heel and long toe; dististyle slender, curved to pointed apex. 

 Aedeagus with high basal arch, the mesal apex of arch narrow; distal 

 stem slender with rounded point. Parameres each with knobbed 

 base, swollen toward base of stem, stem abruptly bent at base but 

 straight in midportion, ventral lobe absent, distal portion somewhat 

 flattened with lateral fringe of sharp barbs, tapering to a needle-like 

 point. 



Distribution: Panama; Honduras. 



Specimens examined: Holotype female (USNM 63169), allotype 

 male, Almirante, Bocas del Toro Province, Panama, November 1952, 

 F. S. Blanton, light trap. Paratypes, 19 males, 80 females: Panama: 

 Bocas del Toro Province: 8 males, 49 females, same data as type 

 except dates October 1952 to March 1953. Canal Zone: 2 males, 1 

 female. Fort Davis, Oct. 7, 1953; 2 females, Loma Boracho, 

 Oct. 29, 1951; 1 male, 1 female, Mindi Dairy, Dec. 17, 1951, Aug. 

 22, 1952; 2 males, 4 females, Mojinga Swamp, Jan. 2, Sept. 4, Dec. 4, 

 1951. Code Province: 1 female, Penonome, Nov. 28, 1952; 1 female, 

 Rio Hato, Sept. 24, 1951. Panamd Province: 1 female, Pacora, 

 June 4, 1951. Honduras: 5 males, 20 females, Lancetilla, July 2, 

 1953 to Feb. 12, 1954, P. Galindo; 1 male, Tela, June 10, 1953, P. 

 Galindo. 



Discussion: This species closely resembles propriipennis Macfie in 

 wing pattern, mesonotal and leg markings, structural characters, and 

 male genitalia, but propriipennis differs by having the sides of the 

 mesonotum brownish instead of bluish pruinose, a third pale spot in 

 cell Ml at the wing margin, the pale spots in cell R5 arranged in a 

 rhomboid instead of a trapezoid, distal sensory tufts on antennal seg- 

 ments III, ix-xiv, and the pit on the third palpal segment broader. 

 The male genitalia of the two species are practically identical, but in 

 propriipennis the stem of the paramere is stouter and not bent near 

 the base. 



