172 DIPTERA OF NORTH AMERICA. [PART III. 



consequence of the very exaggerated breadth of the interval 

 between the first and second bands, the position of the small 

 crossveiu with regard to the posterior one had become altogether 

 distorted, and in order to correct this, he may have drawn the 

 small crossvein a second time, at a correct distance from the large 

 one. Mr. Van derWulp has erroneously taken Chsetopsis senea 

 for a Trypeta and, supposing it a new species, accidentally de- 

 scribed it under the same specific name. 



Observation 2. — The Urophora senea Macq. (Suites, etc., 

 Dipt II, p. 458, 13), may be a synonym of the present species, 

 although I do not consider this as certain. The figure of the 

 wing, as given in Dipt. Exot. II, 3, Tab. XXX, f. 7, shows at 

 the basis of the wing an extensive and very conspicuous black 

 spot, of which there is no vestige in C. senea. It seems certain 

 that Urophora senea Macq. is a species belonging to the present 

 group of Ortalidse. 



2. C. debilis Loew. £. — (Tab. IX, f. 20.) Viridi-chalybea, antennis 

 totis pedibusque ilavis, alis trifasciatis. 



Greenish-blue ; the entire antennae and the feet yellow ; wings with three 

 bands. Long. corp. 0.12; long. al. 0.11. 



Syn. Cluetopsis debilis Loew. Berl. Ent. Zeitschr. XI, p. 318, Tab. II, f. 22. 



Very like the preceding species, but smaller; the white bloom 

 forming a border on both sides of the front is comparatively a 

 little broader ; it has a single row of four bristles upon it, whereas 

 in the preceding species these hairs are much more numerous. 

 The antennae are altogether yellow and their third joint upon its 

 upper side is somewhat more excised. The stigma is compara- 

 tively smaller; the three bands have the same position, but are 

 less pale towards the posterior margin ; the last two are entirely 

 separated from each other, which is very seldom the case with 

 Chsetopsis senea; the last section of the fourth vein is much more 

 straight and shows only a vestige of a slight convergency towards 

 the third longitudinal vein. The coloring of the described speci- 

 men is not green, but greenish steel-blue; of a dirty-yellowish at 

 the basis of the abdomen ; but as it is a rather immature specimen, 

 these differences cannot have much weight. The first segment 

 of the flattened ovipositor is comparatively long. 



Hab. Cuba (Gundlach) 



