2S8 THE CANADIAN ENTOMOLOGIST. 



A NKw spp:ciks of I hk gp:nus lkucopis. 



BV W. R. THOMPSON. 

 Hiirrati of EnU'moK>»f>. I*. S. IVpl. of AurKTllurc. 



This interesting little Agromyzid genus does not appear to contain a 

 great number of species, and but lour have been recorded from America 

 hitherto. These, together with the new form described in this paper, are 

 included in the following table. It will be noted that they differ mainly 

 in the character of the markings of the mesonotum and abdomen : 



Table of Species. 



1. Dorsum of thorax immacuhle 2 



Dorsum of thorax with two brown vittie 3 



2. Abdomen immaculate simplex Loew. 



Abdomen with two lateral s|)ots and a median basal vittula of velvety- 

 black upon the second, third and fourth segments, .macu/ata, n. sp. 



3. Second abdominal segment with two lateral brown spots, third and 



fourth segments immaculate nigricornis Egg. 



Third and fourth abdominal segments not immaculate 4. 



4. Two lateral spots and a basal median vittula on the second abdominal 



segment, only the basal vittula on the third and fourth 



segments bella Loew. 



Two lateral spots and a basal median vittula on second, third and 

 fourth segments bellula Will. 



Since the number of species in the genus is so small, and for greater 



convenience, the full descriptions, compiled from the original sources, are 



given below : 



Leucopis nigricornis Eggcr. 



Egger, Verh. Zool. Bot., XII, p. 782, 1862. 



(J 9 • — Lead-gray, antenna- large, black, thorax bistriate, all of the 

 tarsi yellowish, wings whitish. Length, x]^ lin. 



Antenni-e large, black, cheeks, front and vertex ashen gray, the front 

 above the antennw with an arched groove, which continues on both sides 

 into the facial grooves, the vertex with three long, slightly impressed lines. 

 Thorax, scutellum and abdomen bluish-gray, the thorax with two, not 

 broad, convergent vittx on the nnddle of the dorsum, the abdomen with 

 two black spots. Venter whitish-gray, somewhat shining when viewed 

 from anteriorly. Legs: coxa» and femora to the knees grayish, the knees 

 golden, the tibiae of the first and second pair of legs golden, those of the 



July. 1910 



