SOUTH AMKRICAN DIPTERA. 253 



vein :iud goes nearly straight to the tip of the fourth posterior cell ; beyond the 

 band the wing is clouded with brown, with a small, darker cloud on the anterior 

 branch of the third vein ; with the exception of a cloud on the sixth vein and 

 the posterior part of the anal angle, the basal portion of the wing is hyaline ; 

 between this basal hyaline portion and the cross-band the wing is broadly 

 clouded, especially in front ; in the stigma there is a large yellow spot; in the 

 fifth posterior a white spot, and another, elongate one in the outer part of the 

 first basal and in the discal cells. 



This species is closely allied to E. fascipennis Wied., but the de- 

 scription, as completed by Schiner, shows such differences that the 

 species is surely not the same. 



23. Pronierisana iiasuta Macquart, Dipt. Exot. Suppl. iv, 47, pi. iii, fig. 



4 (Odontomyia). 



One male and two female specimens agree so well with Macquart's 

 description and figures that I have no hesitation in referring them to 

 his species, though described from Chili. The third joint of the an- 

 tennae is longer and more slender, the first joint less dilated than he 

 figures them ; the dorsum of the female abdomen, also, has not three, 

 but four green stripes, separated by three brown ones. 



The structural characters, as given by AValker, of his genus 

 Promerkana agree so well with those of these specimens that there 

 can be scarcely a doubt of their correct location here, though neither 

 of the species that I know can be identified with the type. The 

 genus differs from Odontomyia, more especially, only in the structure 

 of the head and the antennse, but this I believe is sufllicient, Ger- 

 staecker to the contrary, notwithstanding. In F. nasuta the abdo- 

 men is longer and flatter than is usual in sj)ecies of Odontomyia. The 

 peculiar structure of the head is sufficiently well shown in Macquart's 

 figures. P. vittata Walker, seems, from the descrij)tion, to have a 

 more dilated first antennal joint, but this dilatation is not of generic 

 value, as is evidenced by the following new species. 



The tendency to facial or frontal projections seems to be great in 

 the South American Stratiomyinre ; besides Rhingiopsis, iStratioviys 

 conica Wied., Odontomyia J'at<ciata Macq., 0. heteroneura Macq., 0. 

 pachtjcephala Schiner, and 0. pachyceps Bigot, — all apparently have 

 a facial or frontal ])rojection of one kind or another. 



24. Prouierisaua eyliudricornis n. sp. 



% . — Length 12 mm. Black ; abdomen with four yellow spots ; face convex 

 below antennse ; first joint of anteuuse cylindrical. Facial projection strongly 

 convex below insertion of autenuse, less conical than in P. nasuta, the lower bor- 

 der more nearly parallel with the upper, the whole projection shining black, the 



