June iSgo.] 



PSYCHE. 



357 



joint yellow; apical third of the tibia 

 blackened. The mature male has a rather 

 broad metallic black band around the apex of 

 the hind femur, leaving only the extreme 

 tip yellow. In the female and immature 

 male this band is represented bj a more or 

 less distinct black or fuscous spot. In the 

 male there are several (about six) robust 

 spines on the posterior face of the hind tibia 

 and three less conspicuous and obliquely 

 inserted setae at the tip of each of the four 

 posterior femora. Halteres bright yellow. 

 Wings grayish hyaline with black veins ; 

 the posterior cross-vein is some distance in 

 front of the centre of the wing. 



Habitat ; Milwaukee Co., Wis. 



The coloring as described above is 

 constant in five males and three females 

 in my collection. The species is allied 

 to Chrysotus pallipcs, Loew. It dif- 

 fers in having the eyes completely con- 

 tiguous in the male and not separated 

 by a linear white face, and in having 

 the hind legs very diHerently colored. 

 In Loew's species the hind legs are yel- 

 low ; ''even the tarsi are only slightly 

 dusky towards the tip." Loew's 

 specimens could hardly have been 

 immature individuals of C. wis- 

 conslnensls as I have three immature 

 specimens which difler from the matiu^e 

 ones only in having the shining black 

 subapical band of the hind femora 

 represented by a fainter spot. 



Chrysotus pratincola, n. sp. J 



Length 2.25 mm. ; length of wing 2 mm. 



Palpi brown ; antennae black, third joint 

 small, rounded, with apical arista. Face 

 broad for a male Chrysotus, opaque black, as 

 is also the front in my specimen. Cilia of 

 the superior orbit black, those of the in- 



ferior orbit sparse, whitish. Thoracic dor- 

 sum, scutellum and abdomen metallic green, 

 rendered almost opaque by a thick layer of 

 brown dust: pleurae opaque, black. Cilia 

 of the tegulae pale yellowish. The sparse 

 hairs covering the abdomen dirty white. Hy- 

 popygium black, concealed ; venter of a paler 

 and more bluish metallic green than the terga. 

 Coxae opaque black, tipped with yellow and 

 each provided with a tuft of glistening white 

 hairs on the anterior face; these hairs are 

 longest on the fore coxae. Legs not very 

 hairy; femora black with metallic green 

 lustre, especially on the hind pair; their 

 apices and extreme bases yellow; tibiae 

 yellow covered with short weak black hairs; 

 tarsi yellow, blackened on all the feet 

 from the tip of the first joint; hind tarsi 

 scarcely as long as the hind tibiae. Hal- 

 teres honey yellow. Wings hyaline, with 

 very faint grayish tinge ; veins black ; the 

 black costa is moderately incrassated from 

 its juncture with the first longitudinal 

 vein to the tip of the wing; towards which 

 it gradually diminishes in thickness; pos- 

 terior cross-vein in front of the middle 

 of the w-ing. 



Habitat: Saline Co., Nebraska. 



The moderately thickened costa, the 

 broad face and the coloring of the 

 femora place this species near Loew's 

 Chrysotus subcostatus. From this 

 species C. pratincola may be dis- 

 tinguished by its very thick covering 

 of brown dust and the pale hairs cover- 

 ing the abdomen. Perhaps a greater 

 number of specimens than either 

 Loew or I have had the opportunity to 

 examine, may show the two species to 

 be identical. 



Chrysotus choricus, n. sp. $ 



Length 2. mm; lengh of wmg 1.75 mm. 



Bright metallic green. Palpi pale, fus- 



