158 DIPTERA OF NORTH AMERICA. [PART III. 



Dark-green, shining, the abdomen altogether of a vivid metallic 

 green, very shining. The femora of a saturate dark-yellow ; this 

 coloring changes into brownish on the fore tibias from the very 

 basis, on the posterior tibiae farther down ; the fore tarsi are 

 saturate yellow at the basis as far as the tip of the first joint, the 

 posterior tarsi nearly as far as the end of the second joint, beyond 

 this the tarsi are brownish-black. The basis of the costal cell is 

 clay-yellow, or pale ferruginous-yellow, as far as a little beyond 

 the humeral crossveiu ; the stigma is yellowish-gray. In all 

 other respects this species is so very like E. nolata, that one 

 would be inclined to take it for a mere variety of coloring, unless 

 the much lighter coloring of the feet, combined with the darker 

 coloring of the much more shining abdomen, proved the contrary. 



Hob. Texas (Belfrage). 



5. E. costalis FAB. 9. (Tab. IX, f. 10.) Nigro-chalybea, pedibus 

 nigris, genibus tarsorutnque basi rufis, alarum maculis duabus magnis, 

 alterS, costali, altera apicali, nigris. 



Blackish-steelblue, feet black, knees and roots of the tarsi red ; wings 

 witb two large black spots, the first in the middle of the costa, the 

 second at the apex of the wing. Long. corp. 0.15 ; long. al. 0.15. 



SYN. Musca costalis FAB. Ent. Syst. IV, p. 360, 196. 

 Dacus costalis FAB. Ent. Syst. Antl. p. 278, 25. 

 Dacus aculeatus FAB. Syst. Antl. p. 275, 14. 

 Ortalis costalis WIED. Auss. Zweifl. II, p. 464, 13. 

 Euxesta costalis LOEW, Berl. Ent. Zeitschr. XI, p. 301, Tab. II, f. 10. 



Very like both preceding species, but easily distinguished by 

 the narrower front, the absence of a yellow crossband at the end 

 of the abdomen of the female, the perceptibly larger size of the 

 black spot on the middle of the anterior margin of the wings, the 

 altogether black stigma and the course of the fifth longitudinal 

 vein, which reaches the margin of the wing. Blackish-blue, 

 shining ; the head brick-red or of a rusty-red ; front anteriorly 

 of a more saturate coloring, narrow, somewhat whitish pollinose 

 on the orbit of the eye ; the hairs upon it are rather sparse and 

 not at all conspicuous ; the stripes, descending from the vertex 

 along the orbits of the eyes and the immediate surroundings of 

 the ocelli are steel-blue, shining. Occiput blackish, its lower 

 portion and a spot back of the region of the ocelli, brick-red. 

 Antennae brick-red or more yellowish-red ; third joint rounded- 



