D PROCEEDINGS OF THE NATIONAL MUSEUM. vol.65 



bred from old pumpkin vines, cabbage stalks, and butternut hulls: 

 comes to light. P. I. 



L. rufcornis Malloch. — Washington, District of Columbia, May 29, 

 1914, L. O. Jackson. 



*Z. qiiadrisetosa Malloch. — Plummer Island, Maryland, August 

 11, 1912, McAtee; June 3, 1914, R. C. Shannon; District of Columbia. 

 D. W. Coquillett. 



L. vihrissata Malloch. — Cupid's Bower Island, Maryland, July 

 8, 1915, R. C. Shannon; Stubbleiield Fall, Virginia, October 23, 1921. 

 Malloch; Falls Church, Virginia, May 10, N. Banks; Mount Ver- 

 non, Virginia, July 4, 1917, at honey dew, McAtee. 



* L. loinnemanae Malloch. — Cupid's Bower Island, Maryland, 

 July 8, 1915; Dead Run, Virginia, April 11, 1915, R. C. Shannon; 

 Virginia near Plummer Island, April ^ 18, 1909, McAtee ; Falls 

 Church, Virginia, June 6, August 25, N. Banks: College Park. 

 Maryland, May 25, 1913, F. Knab. 



Family PALLOPTERIDAE. 



This family is represented by but one genus in North America, 

 a key to the species of which follows : 



Genus PALLOPTERA Fallen. 



KEY TO SPECIES. 



1. Thorax with cue or two pairs of dorsocentral bristles, the anterior one when 



present weak; propleural bristle absent; stigmatal bristle weak or absent; 



prescutellar pair of acostichals absent subarcuata Jolinson. 



Thorax with four pairs of clorsocentrals, the anterior pair sometimes 

 weak 2 



2. Mesopleura bare 5 



Mesopleura setulose 8 



3. Both cross-veins of wings unclouded 4 



At least the outer cross-vein of wings distinctly clouded 



4. Humeri entirely gray, concolorous with disk of thorax 



claripennis Malloch, new species. 

 Humeri yellow, contrasting with the gray disk of thorax r> 



5. Thorax with about four series of weak whitish hairs between the anterior 



pair of dorsocentrals ; stigmatal bristle absent terminalis Loew. 



Thorax with about eight series of short black setulose hairs between the 

 anterior pair of dorsocentrals ; stigmatal bristle present but weak 



ustulata Meigen. 



6. Thorax gray, densely pruinescent, humeri yellow ; wing with the costal cell 



almost entirely infuscated, and an infuscation at apex 



subusta Malloch, new species. 

 Thorax yellowish ; wing with the entire costal region broadly infus- 

 cated , , 7 



7. Propleural and stigmatal bristles both absent ; head thorax, and abdomen 



grayish pruinescent setosa Melander. 



Propleural bristle presents stigmatal bristle absent: thomx and abdomen 

 not gray pruinescent albertensis John.«;on. 



