8 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 74 



men ovate but colored as in male. Legs plain as in female H. 

 dentipes. Wings and calypters less infuscated than in male, but 

 the latter with dark rim and fringe. 



Length, male 6.3 mm., female the same. 



Described from one male and one female, collected at Perales, 

 Quilpue, Chile, by Father Anastasio Pirion, on January 25. Received 

 from Alfredo Faz, who has other specimens not seen by me. 



ry/?e.— Male, Cat. No. 28876, U.S.N.M. 



Family SARCOPHAGIDAE 



Genus OPSIDIA Coquillett 



Opsidia CoQurLLErr, Journ. New York Ent. Soc, vol. 3, 1895, p. 102. — 

 At.t.kn, Proc. U. S. Nat. Mus., vol. 68, art. 9, 1920, p. 41. 



OPSroiA INTONSA. new species 



Male. — Front narrowest on the lower part where it measures half 

 the head width, the eyes approximate each other still more across the 

 face. Head covered with dark plumbeous pollen and unusually hairy 

 and bristly; frontal stripe almost the same color as the parafrontal, 

 the latter with a somewhat double row of bristles and two proclinate 

 orbitals; parafacials broad with numerous coarse hairs and a diagonal 

 row of bristles above the transverse imj^ression. Front margin of 

 the head in profile is shorter and more vertical than in O. gonioides, 

 genotype of Opsidia, and the third antennal joint is much shorter. 

 Antennae black, the base somewhat reddish, the third joint less than 

 three times the second; arista rather short, the penultimate joint 

 not elongated ; antennal depression quite deep, ending, however, a Tit- 

 tle above the mouth; vibrissae not well developed; palpi brown, of 

 ordinary structure ; proboscis slender at base, the tip broken off. 



Thorax blackish with a little thin pollen forming more distinct 

 cinereous spots on the humeri, postalar declivity and margin of 

 scutellum. Anterior acrostichal 3, posterior numerous and hairlike. 

 Pleurae shining black. 



Abdomen subshining black with thin whitish pruinosity denser on 

 the bases of the segments, except the first, and forming a larger 

 spot on the middle of each. First, second, and third sogments with 

 a single pair of median marginals; fourth segment with two or three 

 pairs. 



Legs black, middle tibia with one bristle on the outer front side; 

 hind tibia with about a dozen forming a rather even row on the outer 

 hind side and one large in the middle of the row. 



Wings subhyaline, the base yellow, veins elsewhere black; first 

 posterior cell open far before the apex; bend of fourth vein with 

 a distinct fold but no fork; hind cross vein joining the fourth more 



