298 PROCEEDINGS OF THE NATIONAL MUSEUM vol. io9 



III, xi-xv. Palpal segments in proportion of 10:25:34:11 :14; third 

 segment slightly swollen, 2.45 (2.3-2.6, n = 2) times as long as broad, 

 with a broad, shallow, sensory pit. Mandible with 14 (13-17, n = 7) 

 teeth. 



Thorax. — Mesonotum pruinose gray, with a prominent pattern of 

 interconnected, subshining dark brown areas on anterior and lateral 

 portions. Scutellum gray pruinose ; postscutellum and pleuron shining 

 dark brown. Legs dark brown, knees narrowly yellowish; base and 

 apex of hind tibia with narrow pale rings; hind tibial comb with six 

 spines, the second from the spur longest. 



Wing. — Pattern as figured, the pale areas milky white to yellowish 

 hyaline ; distal pale spot in cell K5 gradually evanescent towards wing 

 tip. Macro trichia numerous on distal half of wing, sparse in cell M4 

 and in anal cell; costa extending to 0.60 of wing length. Halter 

 yellowish. 



Abdomen. — Blackish. Spermathecaetwo, pyriform, subequal, each 

 measuring 0.061 by 0.045 mm. 



Male genitalia: Ninth sternum narrow, without caudomedian 

 excavation; ninth tergum rounded caudally, with small apicolateral 

 processes and a well-developed, undivided, caudomedian lobe with 

 a distinct thickening on midline. Basistyle with well-developed 

 dorsal and ventral roots, mesal margin with heavy spinose setae; 

 dististyle with bluntly rounded apex. Aedeagus narrow, basal arch 

 with faintly sclerotized membrane across distal half, apex slender 

 and roundly pointed. Paramercs separate, each with stout, abruptly 

 bent base, stout and nearly straight stem and slender, bent, hairy 

 tip. 



Distribution: Mexico; Guatemala; Panama; United States (Cali- 

 fornia, Utah, Washington). 



Panama records: 



CHiRiQuf Pkovince: Cerro Punta, Volcdn. 



Discussion: CuLicoides luteovenus is common in western North 

 America, its range extending northward to Washington and southward 

 along the Central American highlands into the VolcAn region of 

 Panama. In Guatemala it has been taken feeding on horses. 



The covagarciai group 



This group consists of large to medium-sized species with legs yellow 

 or with knees broadly yellow-banded; mesonotum yellowish to brown, 

 subshining; male genitalia like those of the puLicaris group, with 

 basistyles mesally spinose, but with tendency for the development of 

 long apicolateral processes and a caudomedian cleft on the ninth 

 tergum, a basal sclerotized band and distal peg and spherical tip on 



