232 Journal New York Entomological Society, f^'oi- ^^i- 



to griseola, a species which has not been hitherto reported from 

 America. Some individuals lack entirely the spots of the abdomen; 

 in others there is a tendency to forming the median stripe of hella. 

 Quite probably many of the records of hclla should be referred to this 

 species. However, griseola is reported aphidivorous while hella is 

 coccivorous. 



Table of Species of Leucopis. 



Front tarsi wholly or principally yellow 2. 



Front tarsi wholly or principally black ; thorax with two central linear ciner- 

 eous black and two other broad brown vittae ; first abdominal segment 

 blackish, the second with a pair of black dots; front bivittate with 

 black; base of antennae pruinose; legs black or cinereous, the knees 

 and base of posterior tarsi yellow; wings whitish, the costa infuscated. 

 1-1.5 mm. (Eur.;* Ga.,* La.,* Id.,* Wash.*) griseola Fallen. 



2. Abdomen immaculate, thorax and front not vittate ; legs black, the tibiae 



at base and tip and the tarsi yellowish; wings hyaline. 1.5 mm. 

 (N. Y., Mass., N. J., N. H., D. C, Va., Ga., Mich., Nebr., Wash.*) 



simplex Loew. 

 Abdomen more or less spotted ; thorax with two brown stripes 3. 



3. Abdomen with first segment cinereous black, the second segment with a pair 



of blackish spots, and the rest of the abdomen immaculate ; thorax 

 bivittate ; center of front gray, the orbits more silvery ; antennae 

 black. 2 mm. (Eur. ; N. H., N. J., D. C, Ind., La.,* Tex., N. Mex., 



Gal.*) nigricornis Egger. 



Abdomen marked with additional spots; antennae more or less pruinose. . .4. 



4. Thorax marked with two brown vittae convergent behind ; front bivittate 



with cinereous black 5. 



Thorax not vittate with brown ; front cinereous ; abdomen with two lateral 

 spots and a median basal vittula of velvety black upon segments 2, 3 

 and 4. (Nebr.) (Can. Ent., XLII, 241, igio.) . .mactilata Thompson. 



5. Abdomen with the first segment black except the margins, the second 



marked with three spots, the third and fourth with a median basal 

 black spot ; antennae cinereous ; wings milky. (W. Ind., Fla., Col., 



Can., Cal., Mex.) bella Loew. 



Abdomen with the first segment marked with deep brown except laterally and 

 posteriorly, the second, third and fourth segments with a slender sub- 

 interrupted stripe and a pair of rounded brown spots, diminishing in 

 size ; base of antennae cinereous ; wings hyaline. (Tex.,* N. Mex., 

 Mex., Id.*) bellula Williston. 



ACROMETOPIA Schiner. 



Tibiae and front tarsi black; third antennal joint three times as long as wide, 

 bluntly rounded ; front with a broad brown vitta ; abdomen with many 



