June, 1920] Horseflies From Middle America 313 



Pangonia delta n. sp. 



Length of the female 18 millimeters. A pale brown species. Body 

 clothed with black and white hair. Wings very pale yellowish, legs 

 largely dark brown. 



Eyes black, frontal triangle and face light brown, proboscis dark 

 brown, palpi yellowish, slender, projecting forward, antenna largely 

 bright yellow, first two segments thinly gray pollinose and pale haired, 

 beard very pale yellowish. Thorax pale brown, sparsely gray pollinose, 

 not striped, dark brown haired dorsally and pale haired on the sides. 

 Wing pale yellowish, veins yellow, first posterior cell closed and 

 petiolate, second submarginal cell appendiculate. Legs brown, femora 

 darker than the other parts, everywhere dark haired. Sctitellum with a 

 marginal row of long, pale hairs. Abdomen pale yellowish brown 

 slightly darker towards the apex, first segment gray pollinose all over 

 and with numerous pale hairs, following segments pale brown, thinly 

 dark haired, with conspicuous long, white hairs on the posterior margin 

 of each, most numerous toward each side. 



Holotype male from Huachuca Mountains, Arizona, August 

 12, 1899, and paratype male from Palmerlee, Arizona, taken in 

 September. 



This is a difficult species to characterize, because it has no 

 contrasting markings, but is very different in appearance, 

 nevertheless, from other North American species of the genus 

 known to me. 



Pangonia parishi n. sp. 



Length of the female 16 millimeters. A pale species without con- 

 trasting markings, wings fuliginous, darker on the basal half in front, 

 legs yellow, first segment of the abdomen beneath the scutellum dark 

 brown. 



Front pale brown pollinose, at the ocelli about half a millimeter in 

 width, very slightly wider at the lower angle of the eyes. Frontal cal- 

 losity below about one- third the width of the front, gradually narrowed 

 and apparent above nearly to the ocelli. Antenna yellow, first two 

 segments gray pollinose and with a few dark hairs, third segment, 

 enlarged at the base, quite abruptly narrowed, and slender to the apex. 

 Face gray pollinose with a few pale hairs, beard very pale yellowish, 

 palpi slender, of nearly uniform width, yellow, arcuate and black 

 haired; proboscis dark, a little longer than the height of the head. 

 Thorax, including the scutellum light brown above, pale yellowish on 

 the sides and clothed with pale hair; legs yellow, tarsi darker apically; 

 wing fuliginous, noticeably darker on the basal half in front, first 

 posterior cell closed, second submarginal cell with a long appendage. 

 First segment of the abdomen dorsally dark brown beneath the scu- 

 tellum, otherwise first and second segments very pale yellowish with 

 pale hairs intermixed with a very few black ones, third segment 

 of the same ground color, black haired on the basal three-fourths 



