132 DIPTERA OF NORTH AMERICA. [PART IV. 



auxiliary vein, the course of tlie second longitudinal vein, the 

 position of the marginal cross-vein, the hairy appearance of 

 the male forceps, and finally the general appearance and colora- 

 tion of the body, render evident its close relationship to Teucho- 

 lahis.^ 



The other form is at once conspicuous by its rostrum, which is 

 much more elongated than is the case in Teucholabis, and gives 

 it the appearance of a lihamphidia. This resemblance, however, 

 is entirely superficial ; the venation of the wings, as well as the 

 structure of the body, very plainly shows that these insects are 

 most closely allied to Teucholabis. The Rhamphidia chalybei- 

 ventris Loew (Wieii. Entomol. Monatschr. 1861, p. 33), from 

 Cuba, is not a lihamphidia, but belongs to this form of Teucho- 

 labis. 



Description of the species. 



1. T. complexa 0. S. % and 9- — Obscure ocliracea, thoracis vittis 

 tribus brunneis ; alis liyalinis, stigmate subrotundo, fusco. 



Brownish-ochraceous, thorax with three brown stripes ; wings hyaline, 

 stigma rounded, brown. Long. corp. 0.25 — 0.27. 



Syn. Teucholabis complexa 0. Sacken, Proc. Ac. Nat. So. Phil. 1859, p. 223. 



Head dark brown, with a hoary bloom on the front ; antennce 

 and palpi black ; the former with oblong joints on the flagellura. 



' This volume was already in press, when, through the kindness of Dr. 

 Schiner, I received his work on the Diptera of the Voyage of the " Novara" 

 (fieise d, Oesterr. Fregatte Novara, etc. Zoolorjischer Theil ; Diptera; Wien, 

 1868) ; it contains a detailed description, with figures, of the new genus 

 Paratropesa, the generic characters of which had been published some time 

 earlier {Verz. Zool. Bat. Ges. in Wien, 186G). Paratropesa (type: P. 

 singularis Schin., from Colombia, South America) is evidently the above- 

 mentioned form of Teucholabis, of which I have had a glimpse, in 1865, in 

 Mr. Bellardi's collection. The comparison of what I say about it, as I find 

 it among my notes, with Dr. Schiner's description shows, that we agree 

 in the interpretation of the veins forming the submarginal and first pos- 

 terior cells ; but that we disagree in the interpretation of the anterior 

 branch of the second vein, which I considered as a supernumerary cross- 

 vein. Such an interpretation permits me to retain the genus among those 

 with a single submarginal cell, as its relationship to Teucholabis seems 

 otherwise evident to me. Paratropesa is undoubtedly a good genus, and 

 I am glad to have had the opportunity to identify it before the issue of the 

 present volume. Dr. Schiner's description of Paratropesa will be found 

 in tlie Appendix II, at the end of this volume. 



