E. T. CRESSON, JR. 
51 
? . Similar but segment five with median stripe. The abdomen also longer 
than usual. 
Holotype. — d' ; Beverly, Massachusetts, VI, 15, 1875, (Bur- 
gess), [U. S. N. M. No. 20726]. Paratypes. — 2 9 ; topotypical. 
Xotiphila occidentalis new species 
?1868. Notiphila quadrisetosa Thomson, Kong. Svensk. F. Eugenie.s Resa, 
Dipt., 594. 
This species although very similar to scalaris is not identical. 
However it may prove to be only a subspecies. The difference is 
not well marked and is rather difficult to describe. 
Descrtpn'on.— Similar to scalaris Loew, but more robust, darker and tarsi 
sometimes entirely black. Frons more uniformally blackened; the lighter, 
grajush orbits and triangle indistinct or obhterated. Face broader in pro- 
portion to its length, being nearly as broad as long, bluish white to yellowish 
gray; parafacials wider and hghter. Cheeks much broader. Mesonotum 
uniformly dark ohvaceous, if at all only faintly and narrowly vittate; meso- 
pleura faintly marked. The brown abdominal bands shining and generally 
poorly defined. Middle femora generally with three stout bristles on anterior 
surface near apex. Wings brownish or blackish, in some aspects faintly opales- 
cent; all veins blackish with last section of fourth noticeably weaker. Length. 
— 3.5 to 4. 
Holotype. — d Alameda (salt marshes), California, IMaj^ 5, 
1908, (E. T. Cresson, Jr.), [A. N. S. P. No. 6112]. Paratypes. — 
2 9 ; topotypical. 
Specimens Examined. — 3 cf , 10 9 . 
Idaho, (all J. M. Aldrich), [all Aldrich]: Orangeville, VI, 27, 1907, 1 9- 
Juhaetta, 2 9 • Moscow, 1 9 • Potlatch, VI, 20, 1907, 1 9 • White Bird, 
VII, 3, 1907, 1 9 . 
Nevada: Wells, V, 6, 1915, (M. C. VanDuzee), 1 cf, [VanDuzeej. 
Oregon: Beaver Creek, Newport, 1 9, [Aldrich]. 
California: Alameda (salt marshes), V, 5, 1908, 1 o’, (E. T. Cresson, 
Jr.], 1 o’, [A. N. S. P.]; V, 26, 1915, (M. C. VanDuzee), 3 9, [VanDuzeej. 
Berkeley, V, 12, 1915, (M. C. VanDuzee), 1 9 , [VanDuzee]. Berkeley Hills, 
Alameda County, IV, 11, 1908, (E. T. Cresson, Jr.), 1 cf, 2 9, [A. N. S. P.]. 
Palo -\lto (salt marshes), IV, 26, 1906, 1 9 , [Aldrich]. 
Variation. — A female, labeled “12 mi. N. W. of Lusk, Wyo. 
July 1895, U of K. Lot 431,” [Kans.], may belong to a distinct 
species or subspecies, or is an intergrade. The frons is vittate; 
the face yellow, slightly narrower; all tarsi entirely black. 
Syyiomjmy. — The above synonymy is probably correct. This 
species is apparently the most abundant occurring on the Pacific 
coast region that agrees with Thomson’s description, but it is 
TR.VNS. AM. ENT. SOC., XLIII. 
