16 PROC. ENT. SOC. WASH., VOL. 22, NO. I, JAN., IQ2O 



RE- Thorax without such stripes. 



F. Antennae dark; hind legs short, the swelling greater 

 than usual, and mostly covered by a broad, dark 

 band; vein between first and second posterior cells 



angled pictipes. 



FF. Antennae yellow; hind legs longer, the dark band on 



hind femur not so broad; vein between first and 



second posterior cells nearly straight . . brevticorms. 



BB. Hind tibia entirely pale or dark only at extreme tip; hind femur 



usually not distinctly banded. 

 G. Thoracic notum polished reddish. 



H. Dorsum of thorax usually with two rounded polished black 



spots; general color reddish brown badins. 



HH. Dorsum of thorax without black spots; general color yellow- 

 ish red testacens. 



GG. Thoracic notuin not polished reddish. 



I. Abdomen yellow; dark only over sutures incisuralis . 



II. Abdomen with more extensive dark markings. 



J. Abdominal segments dark, pale only near their apices; hind 

 femur with a faint dark mark, bristles of thorax black . . . 



loeu'ii. 



JJ. Abdominal segments with more extensive pale markings. 

 K. One or both of supra-alar bristles pale; larger species 



with duller markings favillaceiis. 



KK. Both supra-alar bristles usually dark; smaller species 

 with markings of abdomen more strongly contrasting 

 flavipes. 



L. annulatus Say. The most abundant species of the genus; 

 season July 7 to September 19. P. I. 



L. atridorsalis Back. Great Falls, Va., July 8 and 2'2, Banks; 

 Maryland near Plummers Island, July 22, 1914, R. C. Shannon; 

 Plummers Id., Md., August 3, 1912, T- R. Malloch; August (), 

 1915, R. C. Shannon; Maywood, Va., August 19, 191(5, McAtee; 

 Falls Church, Va., July 5 to 27; Glencarlyn, Va., June 17 to 

 July 25, Banks; Four-mile Run, Va., July 24, 1915, C. P. Alex- 

 ander. 



L. badius lyoew. Great Falls, Va., June 5 to 12, Banks; Mary- 

 land near Plummers Id., August 1, 1914, R. C. Shannon; Plum- 

 mers Island, Md., June 11, 1912, H. S. Barber; July H), 1912, 

 at light, E- A. Schwarz and H. S. Barber; Falls Church, Va., 

 July 5; Glencarlyn, Va., July 2<>; Beltsville, Md., July (>, Banks. 



L. brevicornis Loew. Great Falls, Va., June 29 to July 22, 

 Banks; Maryland near Plummers Id., July 20, 191.'], R. C. Shan- 

 non; Chain 'Bridge, Md., June 4, 1905, " D. H. demons; Falls 



