ALDRICH AND DARLINGTON. 77 



Twenty-one males and eleven females. Aldrich : Pacific Grove, 

 Cal., May 9th. 



This species is common on the sand dunes south of Point Pines 

 Light, on Monterey peninsula. It flies close down to the sand, 

 resembling in its movements the drifting sand grains; when, it 

 alights, its mottled color blends perfectly with the sand. No infor- 

 mation was gathered as to its food habits or its larval stages. 



- Anorostoma niarginata Loew. 



Length 5.4 mm.; of wing, 5.2 mm. 



Head yellow; occiput clay-yellow, witli a vather wide black stripe running u]> 

 the middle to the vertex ; front a little darker yellow, rather densely pubescent 

 below; antennse small, testaceous, third joint roundish, arista noticeably enlarged 

 at base; face strongly receding below; face and cheeks straw-yellow; one 

 vibrissa ou each side of medium size. 



Thorax yellow, varying to brownish, dorsum pubescent ail over ; the bristles 

 arising from dots; scutellum yellow, bare except the ordinary bristles; meso- 

 pleura with one strong bristle and two smaller ones on the posterior edge, and a 

 few small hairs on the lower auterior corner ; sternopleura with one large and 

 one smaller bristle on the upper edge, besides pubescence and strong bristles 

 below. 



Abdomen varying from yellow to brown ; hypopygium of the male large, 

 yellowish. 



Wings yellowish; the cross-veins and the end of the auxiliary vein strongly 

 infuscated, forming a straight Hue of three dots running diagonally across the 

 wing. 



Legs entirely straw-yellow, pulvilli of about the same color. 



Fourteen males and twelve females. Daecke : Lucaston, New 

 Jersey, May 30th; Brown's Mills, New Jersey, June 21st; Manu- 

 muskin, New Jersey, May 10th. Melander: New Bedford, Massa- 

 chusetts, June 12th ; Colorado. U. S. N. M. : Oswego, New York, 

 Jul}' 1st (labeled Aaorostoma carolinensis Desv.); Colorado. Cooley: 

 East Flathead, Montana, July 25th. Johnson : Manumuskin, New 

 Jersey, May 10th. Tucker: Tabernash, Colorado, August. 



L.f:RI.4 Desvoidy. 

 This genus includes all the members of the family having four 

 dorsocentrals, except those three small groups which offer addi- 

 tional generic characters distinctly their own (^(Ecothea, with spines 

 on the middle of the middle tibiae; Eccoptomera, with very small 

 eyes, and Anorostoma, with peculiar face and oral margin); thus 

 Leria is a residual genus, not homogeneous, yet difficult to divide 

 by satisfactory characters. The genus Scoliocentra, founded by 



TRANS. AM. KNT. SOC. XXXIV. MARCH. 1908. 



