Z PROCEEDINGS OF THE NATIONAL MUSEUM vol.78 



CHAETOPHLEPSIS ORBITALIS, new species 



Mode. — Front, at vertex, 0.42 of the head width (measurements of 

 three as follows: 0.41, 0.42, 0.43) ; inner orbits equidistant from ver- 

 tex to base of antennae, thence gently divergent, entire front grayish 

 poUinose, concolorous ; f rontalia broad, wider than the paraf rontals ; 

 frontal rows of four or five strong bristles extending below base of 

 third antennal joint; ocellar bristles erect, directed outward and a 

 little backAvard; two pairs of strong orbital bristles; inner vertical 

 bristle well-developed. Face grayish pollinose, receding, facial plate 

 sunken; facial ridges bristly three-fourths way from vibrissae to 

 base of antennae; paraf acial narrow, less than one-half the width 

 of the third antennal joint; vibrissae at the oral margin; bucca 

 slightly over one-third the eye height; two geno-orbital bristles. 

 Antennae inserted high above middle of eye; first and second joints 

 black, short; third joint black, broad, and seven or eight times the 

 length of the second; second joint of the arista short, the third 

 thickened for about one-half its length and gradually tapering there- 

 from. Eyes indistinctly short hair}^ Palpi j^ellow, the proboscis 

 short. 



Thorax black, heavily gray pollinose and with a brassy cast, the 

 vittae indistinct; three postsutural dorsocentral bristles; two ster- 

 nopleural bristles; no pteropleural bristle. Scutellum with two 

 lateral bristles on either side, a strong decussate apical and a small 

 discal pair of bristles. 



Abdomen black, gray pollinose with a faint brassy tinge; abdom- 

 inal hairs depressed ; first segment with a lateral macrochaeta only | 

 second segment with two lateral, one discal pair, and one marginal 

 pair ; third segment with three lateral, one discal pair, and one mar- 

 ginal pair and the fourth segment with a discal pair and a com- 

 plete marginal row. Viewed from behind, the fourth segment is 

 wedge-shaped, the posterior margins not contiguous, hence exposing 

 the large, elongated first genital segment. This segment is not re- 

 tractile, thickly gra}'^ pollinose and sparsely beset with fine black 

 hairs; second genital segment small; inner forceps curved under, 

 piercerlike in appearance, and about equal in length to the first 

 genital segment, outer forceps elongate with rounded ends which 

 terminate acutely. 



Legs robust, black; tibiae brownish; front tibiae with two pos- 

 teroventral bristles near the middle and a row of bristles in front; 

 middle tibiae with a stout anterodorsal bristle at about the middle 

 and a weaker one above it, also an inner bristle; hind tibiae with 

 seven or eight short and long bristles on the outer hind side ; all the 

 pul villi short. 



