PARACLIUS. 101 



Table for the determination of the Species. 



Arista with long hairs ; first segment of the costa not swollen. 



1 arcuatus Lw. 



Arista with short hairs ; first segment of the costa strongly swollen. 



2 albonotatus, n. sp. 



Description of the Species. 



1. P. arcuatus LOEW. $> . Obscure viridis, pedibus flavis, ex parte 

 fuscis, alis nigricantibus, primo costae segmento non incrassato. 



Dark green, feet yellow, partially dark-brown, wings blackish, first seg- 

 ment of the costa not thickened. Long. corp. 0.12. Long. al. 0.11. 



SYN. Pelastoneurus arcuatus LOEW, Neue Beitr. VIII, 39, 4. 



Green, bright. Face narrow, still narrower below, covered with 

 thick white dust. Front green, rather dull from a whitish dust. 

 Antennas comparatively small, black, the third joint rounded. 

 Arista with comparatively long hairs, but not feathered. Cilia 

 of the inferior orbit whitish. The upper side of the thorax is 

 upon the first two-thirds of a dark bronze color and less bright, 

 upon the last third of a magnificent golden green color and very 

 bright ; the triangular impression on each side near the transverse 

 suture is thickly covered with white dust ; a small spot in the vi- 

 cinity of the posterior corner of the thorax is dusted in a similar 

 manner. In looking at the thorax from behind, a deep black 

 stripe-like double spot above the root of the wing becomes appa- 

 rent. Scutellum rather bright, of copperish color with a green 

 middle line. The extreme tips of its lateral corners are deep 

 black, and the hairs on its upper side are particularly distinct. 

 Abdomen bright, rather dark green, along the incisures blacker, 

 the lateral margins of the single segments with not very distinct 

 spots of whitish dust. Pleura greenish-black, and rather gray 

 from a thin whitish dust. Fore coxse yellowish-brown, towards 

 the tip lighter ; middle and hind coxae as far as the tip black. 

 Feet brownish-yellow ; fore and middle femora on the upper side 

 brownish, hind femora rather dark brown upon their whole latter 

 part. Hind tibisB, with the exception of the root, dark brown. 

 Fore and middle tarsi from the tip of the first joint dark brown ; 

 the whole hind tarsi blackish-brown. Cilia of the tegulse black. 

 Wings blackened, towards the anterior margin darker ; the last 

 segment of -the fourth longitudinal vein is suddenly bent forward 



