398 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loo 



present on segments iii, vii or viii to x; four tibial spines; two sper- 

 mathecae; male genitalia with ventral root of basistyle foot-shaped; 

 paramere with basal knob simple, ventral lobe usually present and 

 well developed and apex with fringing spines; aedeagus usually 

 V-shaped with pointed basal arch and distal portion with subapical 

 points. 



Panama species: Four: alahialinus Barbosa, barhosai Wirth and 

 Blanton, yurens (Poey), and gorgasi Wirth and Blanton. 



56. Culicoides alahialinus Barbosa 



Figure 59 



Culicoides alahialinus Barbosa, 1952, Nov. Subs. Conhec. Culicoides Neotr., p. 11 

 (female; Limones, Esmeraldas, Ecuador; fig. wing, palpus). — Ortiz and Leon, 

 1955, Bol. Inf. Cient. Nac, vol. 67, p. 571 (Ecuador, female redescribed; fig. 

 wing, palpus, antenna, spermathecae) . 



Female: Length of wing 0.96 (0.89-1.02, n=:10) mm. 



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

 segments in proportion of 20:14:14:14:14:14:14:14:20:20:22:22:34, 

 antennal ratio 1.01 (0.94-1.11, n = 9); distal sensory tufts present 

 on segments iii, viii-x. Palpal segments in proportion of 9:21:24: 

 10:12, third segment moderately swollen, 2.2 (2.0-2.4, n = 8) times as 

 long as greatest breadth, with moderately large, shallow, sensory pit. 

 Mandible with 15 (15-16, n = 7) teeth. 



Thorax. — Mesonotum slightly shining brown, with faint grayish 

 pollen, punctiform brown dots scattered at insertions of mesonotal 

 hairs, no discal pale area apparent. Scutellum dark brown in middle, 

 paler on sides; postscutcllum and pleuron dark brown. Legs pale 

 brown, knees blackish; fore and mid femora with subapical, all tibiae 

 with subbasal and hind tibia with apical, very faint, narrow pale 

 rings; hind tibial comb with four (n = 10) spines, the one nearest 

 the spur longest. 



Wing. — With very faint pattern as figured, appearing grayish; 

 yellowish pale area at wing base and over r-m crossvein; very faint 

 indications of pale spots in cells on distal part of wing located as in 

 gorgasi. Macrotrichia sparse but well distributed on distal half of 

 wing and in anal cell; costa extending to 0.64 (0.61-0.68, n = 10) 

 of distance to wing tip. Halter infuscated. 



Abdomen.— Blackish, cerci pale. Spermathecae two, slightly 

 pyriform, slightly unequal, measuring 0.055 by 0.036 mm. and 0.048 

 by 0.036 mm., the bases of the ducts not sclerotized. 



Male genitalia: Ninth sternum with a deep caudomedian ex- 

 cavation; ninth tergum long, broad at apex with slender apicolateral 

 processes. Basistyle with ventral root foot-shaped, dorsal root 

 slender; dististyle long and curving to pointed tip. Aedeagus with 



