166 MAINE AGRICULTURAL EXPERIMENT STATION. 1917. 



sides, the yellow encroaching somewhat on the frons at the sides. No 

 black stripe over the tubercle but the cheeks in front and narrowly mar- 

 gining the anterior mouth edge, metallic black; behind and across behind 

 the mouth thickly whitish pollinose like the posterior orbits. Antennae 

 chiefly reddish yellow but, in one specimen, considerably darkened on up- 

 per part of second and upper half and tip of third segment; short, the third 

 segment considerably broader than its length beyond the tip of second seg- 

 ment ; arista two-and-a-half times this length, black. 



Mesonotum brilliant shining black, lateral stripes obscurely yellow and 

 with the sides of the thorax pollinose; pile rather long, dusky white. 



Scutellum opalescent yellow like the face, the extreme base and cor- 

 ners blackened; pile long, whitish yellow. 



Abdomen narrow, with nearly parallel sides, a little widest near the 

 middle of the third segment. The first, fifth and following segments shin- 

 ing metallic ; elsewhere opaque black. The second segment with a pair of 

 small, sub-triangular spots about mid-length, separated by a little more 

 than half the length of this segment and distinctly separated from the 

 lateral margins. Third and fourth segments each with a pair of larger, 

 sub-triangular spots situated near, but distinct from, the anterior margin 

 as well as from the lateral margins ; at their widest point occupying near- 

 ly half the length of the segment; separated by a fourth or fifth the length 

 of their respective segments. Pile of the abdomen abundant, whitish, very 

 long at the base and decreasing regularly in length toward the genitalia. 

 Length of wing 7 mm., exceeding the tip of the abdomen; most of the 

 sub-costal cell infuscated; veins black, anterior cross-vein quite perpendic- 

 ular. The fore and middle legs chiefly dull yellow, base of femora, coxae 

 and trochanters infuscated; the hind pair chiefly brownish, lighter about 

 the knees, the femora with rather abundant long delicate dusky pile. Squa- 

 mae, plumulae and halteres whitish, the latter somewhat infuscated. 



J. Eyes bare, face without a black stripe ; mesonotum with 

 yellow lateral margins, scutellum with base and anterior corners 

 very narrowly black. Abdominal segments 2 to 5, inclusive, with 

 brilliant, shining, steel-blue bands on the anterior part which are 

 largely occupied by yellow, sub-triangular spots, of which there 

 are four pairs, going over the side margins in their full width 

 but distinctly separated from each other ; elsewhere opaque black. 



Vertex deep blue-black, shining, continued as a broad, more coppery 

 stripe, evenly of about half the width of the frons, almost to the antennae. 

 The sides of the frons nearly to the vertex, the entire face, cheeks and 

 occiput pale yellow. The sides of the pale frontal stripes, the face (ex- 

 cept a pale yellow oval area on the tubercle and the jowls) and the occi- 

 put thickly covered with silvery white pollen and with delicate white pile. 

 Pile of vertex and frons black. 



Mesonotum brilliant metallic bronze, the lateral margins yellow from 

 the humeri almost to the scutellum, as far as the suture the yellow obscured 

 with white pollen. Pleurae whitish pollinose and with moderately abun- 

 dant white pile. Scutellum golden yellow, the extreme base and corners 



