BITING MIDGES — WIRTH AND BLANTON 367 



of veins Mi, M2 and M3+4 with small pale spots at wing margin; cell 

 Ml with two elongate pale spots, the distal one lying far from wing 

 margin; two pale spots in distal part of cell M2, the distal one not 

 reaching wing margin; a small pale spot present in center of cell M4; 

 distal portion of anal cell with one small round pale spot; cell M2 with 

 a small pale spot lying in front of mediocubital fork and one lying 

 behind medial fork; base of wing broadly pale. Macrotrichia sparse 

 but scattered over wing, including anal cell and base of cell M2; costa 

 extending to 0.65 (0.64-0.67, n = 6) of distance to wing tip. Halter 

 knob infuscated. 



Abdomen. — Dull blackish, cerci yellowish. Spermathecae two-, large, 

 unequal, pyriform, measuring 0.061 by 0.043 mm. and 0.040 by 0.029 

 mm., the bases of the ducts sclerotized a short distance, 



Male genitalia: Ninth sternum with a very shallow caudomedian 

 excavation; ninth tergum broad apically with short, pointed apico- 

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

 long and slender; dististyle slender with narrow, curved apex. 

 Aedeagus with broad, pointed basal arch extending to three-fourths 

 of total length, the basal arms curved and stout; distal apex slender 

 with truncated tip. Parameres each with large basal knob, stem 

 slightly curved basally, straight and fairly stout on midportion with a 

 well-developed ventral lobe, distal portion slender with fine lateral 

 spines. 



Distribution: Panama. 



Panama records: 



BocAS DEL ToRO PROVINCE: Almirante. 



Canal Zone: Fort San Lorenzo, Fort Sherman, Mojinga Swamp (type locality). 



DARiiiN Province: El Real. 



Discussion: This species bears a close superficial resemblance to 

 acotylus Lutz, with its infuscated crossvein, unmarked brownish 

 mesonotum and general wing pattern. However, acotylus can be 

 readily distinguished by the presence of two pale spots in the distal 

 part of the anal cell, by the presence of five rather than three pale spots 

 in cell R5, by the presence of only one pale spot in the apex of cell M2, 

 and by the absence of a palpal pit. 



43. Culicoides acotylus Lutz 



Figure 46 



Culicoides acotylus Lutz, 1913, Mem. Inst. Oswaldo Cruz, vol. 5, p. 69 (female; 

 Rio Tapajos, Mato Grosso, Brazil; fig. wing, palpus). — Barbosa, 1947, 

 Anais Soc. Biol. Pernambuco, vol. 7, p. 10 (Mato Grosso, Brazil). — Ortiz, 

 1952, Rev. Sanid. Asist. Soc, vol. 17, p. 257 (female; Falc6n and Guarica, 

 Venezuela; fig. palpus, spermathecae, wing; synonym, panamericanus Fox). 



Culicoides panamericanus Fox, 1947, Kuba vol. 3, p. 90 (female; Mexico; fig. wing, 

 palpus) . 



