264 HETEROCLIT.E. 



observed. The larva is probably to be looked for in running 

 waters. 



" The other genus Dixa, referred by Meigen and Zetterstedt to 

 the Mycetopkilidce, by Macquart, Westwood and Loew to the 

 TipulidfK, and by Rondani to his Trichocerince (a subdivision of 

 the latter group), differs from the first by the want of ocelli, from 

 the latter by the undivided mesonotum, deep inesosternurn, pecti- 

 nated ungues of anterior legs, broad, rounded tentacles of the 

 vagina, etc., and may be considered of dubious place, until the 

 characters of the larva are known. Westwood (Mod. Class, ii. 

 527, note) and Haliday have indeed supposed that Degeer's figures, 

 Mem. torn. vi. pi. 24. f. 111, are meant to represent a Dixa 

 and its metamorphosis; but although the setaceous antenna?, 

 slender legs, and conspicuous forked vein near the tip of the wing 

 may suggest such a reference, the venation of the wing, as repre- 

 sented, is more like that in Anisomera. Eoser's account (Wurt. 

 Zweyfls.) of the metamorphosis of this last, however, does not 

 agree with Degeer's of the insect in question ; and the express 

 character given of " hairy veins " scarcely leaves any alternative 

 but to suppose it meant for an JErioptera." Hal. 



A. Antennae shorter than the head. 1. ORPHNEPHILA. 



B. Antennae setaceous, shorter than the head. 2. DIXA. 



Genus I. ORPHNEPHILA. 



ORPHNEPHILA, Hal. Zool. Journ. v. no. xix (1831) ; Westw. ; Bond. 

 Thaumalea, Ruthe ; Loew. C/ienesia, Mcq. ; Meig. ; Zett. 



Corpus parvum, oblongum, glabriculum. Caput parvum. Ocelli ro- 

 tundi. Proboscis brevis. Palpi 4-articulati, elongati; articuli cy- 

 lindrici, primus brevissimus ; secundus crassior, ovatus ; tertius et 

 quartus paullo longiores. Antennae filiformes, breves, basi crassaj. 

 Thorax robustus, gibbus. Scutellum mediocre. Ala? nudae, parallelas, 

 sat latae, basi angustatae, apice rotundatse. Abdomen segmentis 

 7, subcylindricum, sat crassum, thorace paullo angustius et fere 

 duplo longius. Pedes subsequales, mediocres, siniplices, nudi, iner- 

 mes ; coxae breves ; ungues et onychia parva ; Mas, oculi in fronte 

 connexi. Anus magnus, valvatus. 



Body oblong, rather small, nearly smooth. Eyes round, large, meet- 

 ing on the front, but not on the under side. Proboscis short, with 

 oblong labella. Labrum still shorter, stout, conical ; ths lateral edges 

 sinuated or toothed ; the tongue concealed. Palpi more that twice as 

 long as the antennae, five-jointed ; first joint shortest ; second thickest, 

 ovate; the others gradually more slender; the fifth not elongated. 

 Antennae near the mouth, snorter than the head, seeming composed of 



