June 1S90.] 



PSYCHE. 



359 



Habitat : Mihvaukee Co., Wis. 



Loew's description of this insect is 

 so brief, being taken from a single 

 imperfectly preserved specimen, that I 

 have seen fit to describe it again. The 

 small size of the species, the pale color 

 of the first antennal joint, which Loew 

 describes as red, but which is really 

 pale yellovv- in well-preserved speci- 

 mens, and the locality (Loew's sptrci- 

 men was from Illinois) are proof suffi- 

 cient that my specimens are true 

 D. ficticoniis. The species is com- 

 mon in damp woods near Milwaukee. 



DiAPHORUS SATRAPA. n. Sp. $ 



Length 2 mm. ; length of wing 1.75 mm. 



Palpi rich brown ; face narrow, covered 

 with thick silvery white dust; antennae 

 yellowish brown, hairy; third joint pointed 

 (with dorsallj inserted arista.'') Front and 

 occiput bronze black, with violet reflection, 

 shifting to cupreous posteriorly, the surface 

 covered with very fine appressed white 

 hairs; inferior orbit thickly powdered with 

 white dust; cilia glistening white. Tho- 

 racic dorsum vivid blackish bronze, with a 

 shining violet patch on the disc, bordered 

 on each side by a broad and obscurely de- 

 fined cupreous band. Scutellum flattened, 

 vivid bronze green. Pleurae bronze green, 

 covered with silvery dust; there is a patch 

 of thick white dust on the humerus, very con- 

 spicuous when the insect is viewed from 

 above, and extending down to the insertion 

 of the fore coxa. Tegulae pale yellow, with 

 white cilia. Abdomen slender, covered with 

 rather stout black hairs; basal segment 

 bronze green ; second and third segments 

 pale yellow, the latter bronzed on its pos- 

 terior border; remaining segments vivid 

 blackish bronze; hypopygium brownish, 

 scarcely protruding, covered with pale yel- 

 lovv hairs. Coxae and feet pale yellovv, 



somewhat slender and not very hairy; fore 

 coxae bearing on their anterior faces several 

 long yellowish brown hairs; median coxae 

 similarly adorned, one of the hairs, however, 

 is very long and blackish ; median femur 

 with two stout blackish spines near the apex- 

 Fore and median tarsi blackened towards 

 their tips, the former very slightly, the latter 

 more conpicuously. Hind legs only moder- 

 ately hirsute; apical half of each femur 

 brown on the upper face; tibiae brownish 

 and the tarsi, excepting the extreme base of 

 the first joint, deep brown. Halteres honey 

 3'ellow. Wings more brownish than gray- 

 ish hyaline, owing to the brown veins and 

 the rather thick covering of microscopic 

 brown hairs; posterior cross-vein verj' near 

 the middle of the wing; third and fourth 

 longitudinal veins gently curved but still 

 parallel ; anal angle not prominent as in 

 several other species of the genus. 



Habitat: Saline Co., Nebraska. 



My single specimen of this beautiful 

 Diafhorjis has lost the tips of the an- 

 tennae and of several of the tarsi, so that 

 I can assert nothing in regard to the in- 

 sertion of the arista or the development 

 of the pulvilli. The other form- 

 characters, however, agree so well 

 with those of other species of Dia- 

 fJioi'tis that I do not hesitate to assign 

 it to this genus. The color of the abdo- 

 men is very unlike that of any described 

 North American Diaphoriis^ but ap- 

 proaches the European D. tripihts^ 

 Loew, D. hoffmannseggii^ Meigen 

 and D. ocidatiis^ Meigen, being close- 

 ly allied to the latter. These European 

 species form a subgeneric group cha- 

 racterized bv the more or less extended 

 yellow band encircling the base of the 

 abdomen. Heretofore no inembers of 



