DIAPHORUS. 



joint of the fore tarsi is about equal in length to all the other joints 

 together. The short hind tarsi are in both sexes dark black-brown. 

 Cilia of the white-yellowish tegulae black. Halteres white-yellow- 

 ish. Wings tinged with gray, with black-brown veins, which are 

 margined with dusky in faded specimens ; they are rather large 

 and broad ; their greatest breadth is close before the middle ; the 

 posterior transverse vein lies in the middle between the extreme 

 root and the extreme tip of the wing ; the fourth longitudinal 

 vein is somewhat distant from the third one ; the first longitudinal 

 vein is comparatively close to the margin of the wing and scarcely 

 reaches one-third of the length of the wings. 

 Hob. New York. ^ 



5. I>. lamellatus, nov. sp. $. Aeneo-viridis, pedibus nigris, 

 tibiarum anteriorum dimidio basali flavo, ciliis tegularum nigris, oculis 

 inaris in fronte separatis. 



Bronze-green ; feet black ; basal half of the four anterior tibiae yellow ; 

 cilia of the tegulse black ; the eyes of the male separated upon the front. 

 Long. corp. 0.13. Long. al. 0.14. 



Dark metallic-green, the color of the scutellum sometimes more 

 blue and that of the abdomen more coppery. Face with thick 

 whitish dust. Palpi small, whitish and fringed with a few black 

 hairs. Antennae small, black ; the arista subapical. Eyes separated ; 

 front much narrower than the face, broader below than above, and 

 covered with thick white dust. Cilia of the upper orbit black, of 

 the lateral and inferior orbits whitish. Thorax, though with dis- 

 tinct, but very thin brownish-yellow dust. On the posterior end 

 of the hypopygium there are six bristles of remarkable strength. 

 The brownish-black exterior appendages are of much larger size 

 than in the kindred species ; they are elongated spatule-shaped, 

 very narrow at the root, rounded at the tip and fringed with 

 blackish hairs. Coxse and feet black ; the trochanter of the fore 

 coxae, the extreme tip of the four anterior femora and basal half 

 of the four anterior tibiae yellow. The hair upon the feet is black, 

 on the under side of the hind femora elongated and more dense 

 towards their tip. The pulvilli of the fore tarsi are rather un- 

 commonly elongated, while those of the middle tarsi exhibit only 

 a small elongation and those of the hind tarsi none at all. Cilia 

 of the white-yellowish tegulae black. Halteres white-yellowish. 

 Wings gray with brownish-black veins, rather large and broad ; 



