154 MAINE AGRICULTURAL EXPERIMENT STATION. I9IO. 



Table of Species. 

 a. Fulvous species. 



b. Thorax with blackish stripes ; hypopygium as figured 

 (fig. 123) ; abdomen not distinctly fasciate. 



I. bifasciatus. 



bb. Thorax without blackish stripes ; abdomen fasciate 



with brown ; hypopygium resembles that of D. piil- 



cher (fig. 125). 2. magnHlcus. 



aa. Blackish species. 



b. Thorax strongly tinged with blue, palpi brownish yel- 

 low or yellow, 

 c. Apical half of antennae pale yellow ; legs mainly 

 black. 3. nehulosus. 



cc. Antennae of the male dark brown; legs mainly 

 yellow. 4. suhcceruleus. 



bb. Thorax and abdomen tinged with brown, palpi dusky; 

 hypopygium as figured (fig. 125). 5. pulcher. 



I. Diomonus bifasciatus Say. 



1824. bifasciatus. Say. Long's Exp. App. 363. {Sciophila). 



Male. Length 8 to 10 mm. Antennae brown; basal joints 

 yellow; face yellow, at the base of the antennae black, remainder 

 of head brownish or blackish ; palpi yellowish. Mesonotum 

 yellow with a pair of oblique slender blackish stripes which 

 arise near the anterior margin where they are clubbed, and meet 

 at the base of the scutellum ; another wider stripe along the lat- 

 eral margin which nearly or quite touches the oblique stripe 

 anteriorly; metanotum yellowish brown; lower half of the 

 pleura brownish ; hairs yellowish for the most part. Abdomen 

 reddish, segments but slightly if at all darkened apically; hypo- 

 pygium small (fig. 123). Legs yellow, tarsi slightly darker; 

 fore metatarsus nearly 1.5 times the tibia in length; wings yel- 

 lowish tinged, with a brown spot covering the small cell and the 

 crossveins, short preapical fascia extending from the tip of R^ 

 t) Ml and a very faint cloud proximad of CxXn ; anal vein strong 

 but incomplete. Halteres yellow, base of the knob more brown- 

 ish. 



Recorded from Northwest Territory, and N. H. My speci- 

 men is from the latter locality. 



