BITING MIDGES — WIRTH AND BLANTON 437 



flagellar segments in proportion of 14:11 .13 .15:15:14:14:15 -14 -14 IS- 

 15:25, antennal ratio 0.79 (0.75-0.84, n = 3); distal sensory tufts 

 present on segments iii, viii-x. Palpal segments in proportion of 

 6:11:19:6:7, third segment very short and swollen, 1.6 (1.5-1.7, 

 n = 9) times as long as greatest breadth, with a moderately large and 

 deep sensory pit. Mandible with 14 (13-15, n=5) teeth. 



Thorax.— Mesonotum pruinose brown with pattern as figured 

 consisting essentially of a sublateral pair of darker brown patches,' 

 widest at midlength; scutellum, postscutellum and pleuron dark 

 brown. Legs dark brown, fore and mid femora with subapical, all 

 tibiae with subbasal and hind tibia with apical, narrow pale rings- 

 hind tibial comb with four (n = 9) spines, the one nearest the spur 

 longest. 



Wing.— Pattern as figured; two, slightly separated, poststigmatic 

 pale spots in cell R„ the posterior one lying only slightly proximad of 

 the anterior one; distal pale spot in cell R5 moderately large, rounded; 

 two pale spots in cell Mi; one pale spot each in apices of cells M2, M^ 

 and anal cell, the one in anal cell faihng by its own diameter to liieet 

 wmg margin; a pale spot lying ahead of mediocubital fork and another 

 pale spot lying behind medial fork. Macrotrichia sparse on distal 

 third of wing, none in anal cell, cell M, or base of cell M2; costa extend- 

 ing to 0.59 (0.57-0.62, n = 9) of distance to wing tip, second radial cell 

 well developed. Halter brown, the flat end of the knob whitish. 



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

 slightly unequal, measuring 0.048 by 0.034 mm. and 0.043 by 0.031 mm! 



Male genitalia: Ninth sternum with very broad and shallow 

 caudomedian excavation; ninth tergum long, with large, triangular, 

 apicolateral processes. Basistyle with ventral root large and foot- 

 shaped, dorsal root slender; dististyle slender and nearly straight with 

 hooked apex. Aedeagus with basal arch rounded caudad, extending 

 slightly more than half of total length of aedeagus, basal arms slender 

 and curved; distal apex broadly expanded and well sclerotized, with 

 three pointed lobes of subequal lengths. Parameres each with knobbed 

 base, stem abruptly bent near base, very slender, midportion sinuate, 

 no trace of ventral lobe, apex pointed with lateral fringe of fine hairs.' 



Disteibution: Trinidad; Panama; Puerto Rico; Virgin Islands. 



Panama eecords: 



Canal Zone: Fort Clayton. 

 Panama Province: Isla Taboga. 



Discussion: These new Panama records are based on two males, 

 the genitaha of which show the very distinctive characters of hofmani. 



