BITING MIDGES — WIRTH AND BLANTON 413 



Thorax. — Mesonotum dark brown with a prominent pattern of pale 

 spots and patches; a submedian anterior pair of elongate yellowish 

 spots and several smaller pruinose yellowish gray spots around lateral 

 margins. Scutelliim dark brown in middle, yellowish on sides; 

 postscutelliim and pleuron dark brown, pleuron yellowish above. 

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

 with subbasal, narrow pale rings; hind tibial comb with four (n = 6) 

 spines, the one nearest the spur longest. 



Wing. — Pattern as figured; second radial cell very dark; pale spot 

 over r-m crossvein extensive; cell R5 with four small well-separated 

 round pale spots distributed in a rhomboidal pattern, the two anterior 

 spots situated distad of the posterior ones; apex of vein Mi with a pale 

 spot at wing margin; three pale spots in cell M,, the distal one located 

 at the wing margin and sometimes faint; two pale spots in distal part of 

 cell M2; small round pale spot in center of cell M^; two well-separated, 

 small round pale spots in distal part of anal cell, a faint, irregular, 

 pale area at base of anal cell; cell M2 with a pale spot lying behind 

 medial fork, one lying in front of mediocubital fork and a faint one 

 near base of cell; a pale area distad of basal arculus. Macrotrichia 

 sparse on distal third of wing; costa extending to 0.63 (0.62-0.65, 

 n=8) of distance to wing tip. Halter with base of knob brownish. 



Abdomen. — Dark brown, cerci yellowish. Spermathecae two, ovoid, 

 subequal, measuring 0.055 by 0.039 mm. and 0.050 by 0.031 mm., the 

 bases of the ducts sclerotized a short distance. 



Male genitalia: Ninth sternum with a broad caudomedian 

 excavation; ninth tergum short and tapered, with short apicolateral 

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

 and tapered; dististyle slender and curved with bent tip. Aedeagus 

 V-shaped, the basal arch pointed caudad, extending to three-fourths 

 of total length, the basal arms straight, the posterior portion slender 

 with simple tip. Parameres each with large basal knob, stem slender 

 near base, slightly swollen in midportion, gradually tapered distally 

 to slender tip with a subapical fringe of spines, the portion at the base 

 of the fringe slightly expanded. 



Distribution: Mexico; Guatemala; Nicaragua (Villa Somoza); 

 Venezuela. 



Panama records: 



BocAS DEL ToRO PROVINCE: Almirante, 



Canal Zone: Fort San Lorenzo, Huile Sia Clara (?), Loma Boracho, Mojinga 



Swamp. 

 CniRiQuf Province: Concepci6n. 

 CocLfi Province: Penomon6. 

 Dari£n Province: Garachine. 

 Panama Province: Pacora. 



475684 O - 59 - IZ 



