BITING MIDGES — WIRTH AND BLANTON 325 



segment greatly swollen, 1.8 times as long as greatest breadth, with a 

 large, deep, sensory pit opening by a small pore. Mandible with 14 



teeth. 



Thorax. — Mesonotum with prominent pattern as figured, consisting 

 of a pair of sublateral dark brown broad longitudinal bands, with a 

 pair of small anterior submedian spots and several lateral pairs of 

 small spots, pruinose yellowish gray. Scutellum narrowly dark 

 brown in middle, pale on sides; postscutellum and pleuron dark 

 brown. Legs dark brown, knee spots blackish; fore and mid femora 

 with subapical and all tibiae with subbasal narrow pale rings; hind 

 tibial comb with four spines, the second from the spur longest. 



Wing.— Pattern as figured; pale spot over r-m crossvein broadly 

 reaching costal margin; cell Rg with single, transverse, poststigmatic 

 pale spot and a small pale spot in middle of cell, the posterior margin 

 of which is connected by a somewhat obscure, narrow pale line near 

 posterior margin of cell to a smaller pale spot at wing margin in apex 

 of cell; cell Mi with an elongate pale spot at wing margin; vein M2 

 straddled by a pale spot near its base; cell M2 with a pale spot at 

 wing margin; cell M4 with a pale spot at wing margin connected 

 anteriorly to a narrow pale line along posterior margin of vein M3+4 

 (Mirsa and Ortiz' figure shows this line also extending down distal 

 margin of vein CuO ; anal cell with two distal pale spots; cell M2 with 

 a pale spot lying in front of mediocubital fork and another lying behind 

 medial fork ; a small pale area at basal arculus and another lying on 

 base of mediocubital stem. Macro trichia dense and long, extending 

 to bases of medial and anal cells; costa extending to 0.59 of distance 

 to wing tip. Halter pale. 



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

 slightly unequal, measuring 0.043 by 0.034 mm. and 0.038 by 0.031 

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



Male genitalia: Ninth sternum with scarcely perceptible caudo- 

 median exacavation, ninth tergum tapered with large caudomedian 

 notch and large, triangular, apicolateral processes. Basistyle with 

 dorsal and ventral roots subequal, simple and slender; dististyle 

 slender with hooked tip. Aedeagus with pointed basal arch extend- 

 ing to half of total length of aedeagus; distal portion tapered to 

 simple, slender tip. Parameres each with slender anterior process on 

 basal knob; stem rather stout and sinuate, tapered distally to simple, 

 filiform tip abruptly bent ventrad. 



Distribution: Mexico; Venezuela; Panama. 

 Panama records: 



CniRiQuf Province: Cerro Punta, Volcdn. 

 Panama Province: Cerro Campana. 



