XANTHOCHLORUS. 223 



ceding species, and is a little more distant from the tip of the 

 wing. 



Hub. New York. 



Gen. XLI. XAtfTHOCHLORUS. 



Character. Color of the body non-metallic, yellow, often with 

 green spots. Antennae very short ; their first joint remarkably 

 short and without hairs, the second transverse, the third very short ; 

 the arista, which is distinctly clothed with hairs, is inserted upon 

 the back of the third joint, in the vicinity of the basis. The 

 thorax has upon its posterior half an impressed surface, which is 

 sloping downwards. The last segment of the fourth longitudinal 

 vein is but very gently inflected, and converges somewhat towards 

 the third longitudinal vein ; the sixth longitudinal vein disappears 

 already far before the margin of the wing. Feet rather, long ; 

 hind tarsi much shorter than the hind tibise ; their first joint with- 

 out bristles and shorter than the second. Abdomen of the male 

 not elongated ; the hypopygium rather swollen, not imbedded, 

 pointing straight backwards, so that the abdomen thereby appears 

 to be somewhat elongated ; the appendages are small, but dis- 

 tinctly visible. The abdomen of the female obtuse at the tip, 

 somewhat impressed below, and without a coronet of bristles. 



In consequence of the color of the^body, the species of Xantho- 

 chlorus might perhaps be mistaken for species of the genera Chry- 

 sotimus and Saucropus. In Chrysotimus the position of the arista 

 is more subapical ; the third and fourth longitudinal veins are 

 parallel, the feet shorter, and the hind tarsi almost as long as the 

 hind tibiae, the hypopygium of the male is smaller and imbedded, 

 and the last segment of the female abdomen protrudes in the form 

 of a short ovipositor. Of all this, nothing is to be found in Xan- 

 thochlorus. In Saucropus the abdomen is elongated, the hypopy- 

 gium inflected under the abdomen and the last abdominal segment 

 of the female is a sort of an ovipositor ; all this is not to be found 

 in Xanthochlorus ; the feet of the species of Saucropus are also 

 much more elongated than those of the species of Xanthochlorus. 



The name of this genus (from a>o$, yellow, and z*-"Ps, green) 

 has reference to the peculiar color of the species. 



Besides a few European species, only the following North 



