PSOROPHORA JOHXSTOXII 573 



scales. Proboscis and palpi black, covered with black scales with violet reflections. 

 Clypeus black. Prothoracic lobes with white scales and long black bristles. Meso- 

 thorax covered with creamy white spindle-shaped scales on a black background; 

 scales arranged more thickly on the lateral areas; a number of black bristles 

 scattered over the mesothorax, especially abundant on the postero-lateral areas. 

 Pleura with silvery scales and golden hairs. Scutellum with white scales and a 

 median and two lateral groups of numerous long black bristles. Metathorax black. 



Abdomen violet, basal segment with pearly-white scales and golden bristles; next 

 five segments with lateral apical white-scaled areas; numerous black hairs scattered 

 over the segments. Venter white scaled, with narrow basal bands of violet scales. 

 Legs with metallic violet reflections, base and most of the venter of femora yellow 

 scaled; knee spot white, small; third hind tarsus completely white except a few 

 apical black bristles. Ungues all equal and uniserrate. Wings with the first sub- 

 marginal cell a little longer and nearly as broad as the second posterior cell, its stem 

 the same length as the cell; stem of the second posterior about as long as the cell; 

 halteres with stem and knob pale yellow. Length 4.5 mm. 



Observations. Described from four $'s taken on a horse at the foot of the Red 

 Hills, 5 1/2 miles along the Molynes Road, Kingston, Jamaica, early in July, 1905. 

 Found in association with the brilliant J. discrucians. Walker. It is apparently 

 closely allied to /. Arrihalzagw, Giles, from which it may be distinguished by its wing 

 venation, scutellar bristles and white third hind tarsus. 



Original Description of Janthinosojia schwarzi: 



As in J. coffini Dyar & Knab, but the tips of the hind femora are pure white. 

 One specimen, Cayamas, Cuba, May 7 (E. A. Schwarz). 

 Type. Cat. No. 9970, U. S. Nat. Mus. 



Description of Female of Psorophora johnstonii (Male and Larva Unknown) : 



Female. Proboscis moderate, rather slender, straight, cylindrical, uniform, 

 labellffi conically tapered ; vestitiire of dense black scales with a bluish luster ; 

 setae very small, those on labellse more prominently outstanding. Palpi nearly 

 one-fourth as long as the proboscis, clothed Avith glossy black scales and a few 

 black bristles, xlntennae slender, the segments subequal, rugose, ciliate, black ; 

 second joint somewhat longer and thicker, pale at base ; tori subspherical, with a 

 cup-shaped apical hollow, blackish, a patch of white scales on inner side and a 

 small one without; hairs of whorls sparse, black, Clvpeus elligtical, prominent, 

 black, shining, nude. Occiput convex, black, clothed with broad, curved yellow- 

 ish-white scales and some erect, forked luteous ones which become very numer- 

 ous at nape, a blue spot at the side ; bristles along margins of eyes mostly short, 

 black, some pale ones projecting at vertex. 



Prothoracic lobes prominent, remote, black, clothed with yellowish-white 

 scales and short black bristles. Mesonotum black, clothed with elliptical yellow- 

 white scales which are dense and uniform along sides of disk but on dorsum are 

 mixed with narrow, curved black ones, although not forming a defined pat- 

 tern ; setse numerous, short, black. Scutellum trilobate, black above, pale on pos- 

 terior side, clothed with elliptical yellowish-white scales and about eight black 

 bristles on each lobe. Postnotum elliptical, black, prominent, nude. Pleurae 

 black, clothed with elliptical white scales and a few pale bristles ; coxae similarly 

 colored and clothed. 



Abdomen subcylindrical, flattened, the distal segments strongly tapering; 

 dorsal vestiture of flat black scales with a blue luster and rather large quadrate 

 patches of creamy white scales on posterior lateral angles of segments, expanded 

 beneath into broad longitudinal stripes; first segment clothed with broadly 

 elliptical white scales and with many pale hairs ; venter almost wholly clothed 

 with yellow-white scales, the seventh segment with a large blue spot at base. 



Wings moderate, membrane hyaline with a slight smoky tint and iridescent 

 reflection; petiole of second marginal cell shorter than its cell, that of second 

 posterior cell equal to its cell ; basal cross-vein less than its own length distant 

 from anterior cross-vein; veins brown; scales blue black, the outstanding ones 



