122 DIPTERA OF NORTH AMERICA. [PART IV. 



development of the mesosternuni. Such analogies are to be kept 

 in view, till further discoveries point out their true significance. 



The foregoing description has been prepared from two speci- 

 mens found in Germany, and which I owe to Mr. Loew's com- 

 munication. They belong, if I am. not mistaken, to Limnobia 

 alpina Zett. {Dipt. Scand. X, p. 389, 69) ; two other species 

 described by the same author (1. c. 10, 71) — L. virgo and juve- 

 nilis — apparently belong to the same genus. A species similar 

 to, or identical with the one I have now before me, has been seen 

 by me in Mr. Bellardi's collection in Turin ; I believe that it was 

 taken in the north of Italy. No American species has as yet 

 been discovered. 



The name of this genus, introduced here for the first time, is de- 

 rived from dpatfiapyoj, meaning extravagantly fond of mountains. 



Gen. XI. EIXIPTERA. 



One submarginal cell ; four posterior cells ; discal cell open, coalescent 

 with the third posterior cell ; prsefurca straight, very closely approximated 

 to the first longitudinal vein (Tab. I, fig. 10). Antennae 16-jointed. Tibiae 

 without spurs at the tip ; empodia not distinct. Forceps of the male rather 

 elongated. 



As I have not seen this interesting European genus, I borrow 

 the description partly from its author, Dr. Schiner, partly from a 

 written communication of Mr. Loew; the description of the vena- 

 tion I prepare from specimens of wings which I have before me :* — 



Head rounded, transverse, rather closely applied to the thorax; 

 rostrum very short; antenna? of moderate length, 16-jointed; 

 first joint short cylindrical, second globose ; the third rounded 

 oval, but little longer than broad ; the following joints almost 

 globose, with short hairs. Front broad ; eyes glabrous, rounded. 

 Thorax gently convex ; collare distinct, but short ; transverse 

 suture distinct ; metathorax well developed ; abdomen narrow, 

 the two halves of the forceps long and narrow, leaving an open 

 space between them when closed ; ovipositor short, arcuated at 

 the tip. Feet long and slender ; tibia? without spurs at the tip 

 (the pubescence, as it reaches the tip has sometimes the appear- 

 bnce of spurs, which do not exist) ; empodia indistinct. Wings 

 folded flat over the body, when at rest. 



1 Several wings were kindly sent to me by Dr. Schiner in a letter. 



