BITING MIDGES — WIRTH AND BLANTON 445 



the remaining parts on another, no locaUty given. This specimen 

 differs sHghtly from the others, being larger, wing 0.83 mm. long; 

 mandible with 21 teeth; third palpal segment 2.5 times as long as 

 broad; antennal segments iii-xiii in proportion of 15:13:13:13:13: 

 13:13:15:16:16:18, sensoria present on segments iii and viii-x on 

 one side and iii, vii-x on the other. We believe that this specimen 

 would still fall within, and extend slightly in some characters, the 

 range of variation found in debilipalpis. 



The wing pattern of debilipalpis is similar to that of equatoriensis 

 Barbosa, germanus Macfie, hojfmani Fox, imitator Ortiz, insinuatus 

 Ortiz and Leon, and trilineatus Fox, all with one pale spot in apices 

 of cell M2 and anal cell, two pale spots in cell M,, no pale spots at 

 the wing margin at the apices of the veins, the distal pale spot in cell 

 R5 not very large nor meeting anterior wing margin and the post 

 stigmatic pale spots usually separate, with the posterior one lying 

 slightly proximad of the anterior one. These species all have rather 

 hairy wings, two spermathecae present, the antenna with segment xi 

 not conspicuously shorter nor longer than segment x and distal 

 sensory tufts present on segments iii, viii, ix and x. 



In hojfmani the macrotrichia are usually confined to the distal half 

 of the wing, the third palpal segment is broader with a broader pit, 

 the eyes are more distinctly hairy and the male genitalia have the 

 aedeagus trilobed and the parameres lack the ventral lobes. In 

 imitator Ortiz the posterior poststigmatic pale spot in cell R5 is located 

 distad of the anterior one, the pale spot lying in front of the medio- 

 cubital fork is lacking and the third palpal segment lacks a definite 

 sensory pit. Culicoides germanus and insinuatus have a similar wing 

 pattern but the anterior femora are dark in insinuatus and the fore 

 and mid legs are dark in germanus, and in germanus the posterior 

 poststigmatic pale spot lies far proximad of the anterior one and there 

 are sensoria present on antennal segment vii. Culicoides equatoriensis 

 Barbosa from Ecuador resembles hojfmani and germanus in wing 

 markings, in the restriction of the macrotrichia to the distal half of 

 the wing, and in the broad, shallow, palpal pit, but differs from these 

 species and from debilipalpis in having the eyes bare and contiguous 

 and the knees bordered by pale rings on both sides on all three pairs 

 of legs. Culicoides trilineatus has an even hairier wing than debilipal- 

 pis, but the pale spots in cell Mi and the distal one in cell R5 are much 

 smaller, the mesonotum has a pattern of narrow dark lines, the third 

 palpal segment is even longer and more slender, the mandible has 

 more teeth (18) and antennal sensoria extend proximad to the fifth 

 or sixth segment. 



Other species with similar wing pattern and macrotrichia extending 

 to the base of cell M are transferrans Ortiz and rangeli Ortiz and Mirsa, 



475684 0-59-14 



