AMERICAN DIPTERA. 217 



elongate, rounded, slightly tapering. Bristles on the occiput, 

 humeri, posterior portion of thoracic dorsum, sides of thorax, 

 coxa? and two on scutellum well developed. Legs with stiff 

 hairs and longer bristles; the bristles are very stout and 

 numerous on the distal portions of all the tarsal segments; 

 the front tibias without a terminal elaw-like spur; pulvilli 

 normal. Wings with first posterior cell wide open ; the fourth 

 closed before the margin. 



Type. — Dasypogon capnopterus Wiedemann, and Dasypogon 

 magnificus Walker. 



Archilestris magnificus. 



Dasypogon magnificus Walker, List, VI, 427, 1854. 



Microstylum magnificus Bellardi, Saggio, II, 79, 1861, PI. I, fig. 2. 



Dasypogon magnificus Schiner, Novara, 168, 1868. 



Archilestris magnificus Os. Sacken, Biologia, Dipt. I, 169, 1887. 

 9 . — -Length about 40 mm. — Thorax a deep rich velvety reddish- 

 brown; abdomen red throughout; wings deeply tinged with brown, 

 but clear at base in the first and second basal and in the anal cell, 

 except for a cloud in the distal part of each, and at the base of the 

 axillary, the first, fourth and fifth posterior, discal and marginal cells. 

 Face densely covered with fine short appressed pile, appearing 

 pruinose; the single row of bristles forming the mystax black. Front 

 rich brown pruinose, with a few black bristles along the orbits and 

 longer ones on the tubercle. Occiput brown pruinose with black 

 bristles along and above the outer orbits, and black hair below. 

 Palpi and antennas reddish with black bristles and hair. Thorax 

 everywhere of the same color, with black bristles forming a row over 

 base of wings, on posterior callosities, two short rows on either side 

 of where the geminate stripe would be if it were present, and two 

 bristles on posterior margin of the otherwise bare scutellum black; 

 thoracic dorsum and middle of pleurae with short black hair. Ab- 

 domen red with short microscopic red hair above and black on the 

 sides; the venter with black hair, short, except on the first segment. 

 Lateral margins of the first segment with short black bristles. Legs 

 almost black with bristles and hairs of the same color; claws wholly 

 black, empodia longer and red; pulvilli whitish. 



Type. — British Museum. 



Habitat. — Mex. (type); near city (Craveri, Salle), Yantepec 

 (Truqui), Hastec (de Saussure), Ventenas (Osten Sacken); 

 S. Am., (Schiner). 



There are specimens at the Nat. Museum from Guanajuato 

 and Tepri, Mexico, and a female at the M. C. Z. from Panama. 



TRANS. AM. ENT. SOC., XXXV. (28) JUNE, 1909. 



