ALDRICH AND DARLINGTON. 87 



L<<*ria leucostoiiia Loew. 



Length of body 3.7 mm. ; of wing 4.4 mm. 



Vertex and occiput gray; front saffion-yellow; antennse brownish yellow, 

 third joint round, arista black, only microscopically pubescent ; orbits of the eyes 

 whitish ; face somewhat cream colored, cheeks about one-third the width of the 

 eye; eyes round ; vibrissse one on each side, ralher strong. 



Dorsum of the thorax ashy gray, rather densely pubescent; dorso-central bris- 

 tles rather slender; humeri conspicuously reddish-yellow; propleurte reddish- 

 yellow; mesopleurae gray except the margins, which are yellow, bare; sterno- 

 pleurte yellowish, one strong bristle and four or five hairs on the upper edge; 

 scutelium yellow, bare except the ordinary four biistles. 



Abdomen from yellow to brown, each segment with a silvery posterior margin ; 

 hypopygium yellow, of medium size. 



Wings entirely hyaline; spines of the costa small. 



Legs yellow; all the tarsi and the distal end of the tibiae brown. 



Three male specimens. Johnson : Hampton, New Hampshire, 

 May 25th and September 12th. Aldrich : Mt. Constitution, Wash- 

 ington, July 7th. U. S. N. M. : White ^Mountains, JNIorrison. 



Leria glaiica Aldrich, u. sp. 



Length 6.1 mm.; of wing 7.5 mm. 



Occiput, vertical triangle and thorax, except apical part of scutelium, of a 

 smooth glaucous gray color, much as in Tephroehlamys rtifiventris and Leria serraia. 

 Remainder of head reddish-yellow, third joint of antenna infuscated, the arista 

 long and slender. Cheek fully half the width of the eye. A single vibrissa, the 

 hairs behind it small. 



Bristles of the thoracic dorsum long, the intervening hairs fine and short; tlie 

 bristles are seated on blackish dots; a slender median brown line on the dorsum, 

 abbreviated at both ends; scutelium yellowish on the apical part, flat and bare, 

 with the usual four bristles; pleurte concolorous with dorsum, mesopleura and 

 pteropleura bare, except a few hairs on the former in its lower front comer; 

 sternopleura with one bristle and covered with fine haiis, which become larger 

 below. Halteres yellow. 



Abdomen dark yellow in ground color, but considerably blackened above 

 except near the apex ; hind margins of the segments lighter except the first. 



Legs including coste yellow, the tarsi darker toward the tip; claws and pul- 

 villi large; hind metatarsus with two bristles below near the base. 



Wings hyaline, long and wide. 



A single female, Pullman, Washington, April 16, 190-^, from 

 Professor jNIelander. 



The species has a marked resemblance to serrata, l)ut the abdomen 

 is considerably black above, the hairs in the vicinity of the vibrissa 

 are small ; the anterior fronto-orbital bristle is very sniall. while in 

 ■<errata it is nearly as large as the one behind. 



TEANS. AM. KNT. .^OC. XXXIV. MAKCII. 190S. 



