BY C. h. HARDY. 



537 



speeies, C. vittata, in which the upper branch of the cubital fork and tlie third 

 posterior vein are obsolete, and the discal cell is complete. 



The genus Xenvmvrpha Macquart was founded upon a species, X. leptiformis, 

 in which only the upper branch of the cubital fork was obsolete, that is, the third 

 posterior vein wa-s present, otherwise the characters are identical with Wiede- 

 mann's species. Australian specimens show variations in which the upper branch 

 of the cubital vein may be present or absent and the discal cell may be partly 

 open, and finally the third posterior vein may be absent, but such an occurrence 

 is rare. 



The genus Uiilirrua Philippi was founded on a Chilian species, //. krausei, 

 in which the thinl posterior vein is absent. Australian specimens conform to 

 this and individual specimens with the discal cell partly open are rather common, 

 thus showin.^- a connecting link with Lugarus; the upper branch of the eutiital 

 fork is also sometimes absent and in this way unites Lagarus with the typical 

 Chiromyza. 



The genus Lagarhnt^ Enderlein was proposed for a Chilian species, L. para- 

 doxus, which conformed in the characters to Lagarus (preoccupied). Enderlein 

 placed Lagarus as a synonym of his new genus Lagariniis and erroneously re- 

 moved the group to tiie family Scenopidae. Krober copied Enderlein's description 

 and appended it to the end of his revision of the genera of Scenopidae without 

 comment . 



Tiie characters of the genus Metoponia. given by White, conform to the 

 Xenumorpha of Macquart. 



The following key will make the relation between these various species clear. — 



1. Speciies with four posterior veins 2. 



Species with five posterior veins, the third of which is stunted . . Xenornorpha. 



2. The discal cell open, all traces of the cross vein closing the discal cell obsolete. 



Lagarus and Lagariiuis. 

 The discal cell closed, or at least the vein that closes the discal cell is indi- 

 cated '^ ■ 



3. The cubital vein forked Hy/oius. 



The cubital vein simple Chiroinyza. 



These differences of character are variations that grade into each other and 

 are of less than specific value. 



In the original description, the genus Nonacris Walker is described as having 

 the antennae seven segmented and the second joint much longer than the first, 

 but Osteu-Sacken states that the type, X. trausequa, from South America, appeai-s 

 to be a Chiromyza as he could not find any difference. 



Definition. — The eyes are contiguous or separated in tlie male and widely 

 separated in the female; the antennae are shorter than the head, the first joint 

 is short, the second about the same size, and the third scarcely exceeds the length 

 of the two basal joints united; a species described as Xenornorpha grandicornis 

 Hardy, has the third joint considerably longer and does not belong to this genus 

 as defined here. The abdomen of the male is depressed; the genitalia conform to 

 those of other genera of the Beridinae. The female has the basal segments of the 

 abdomen distended and the apical segments attenuated ; there are four distended 

 segments and three narrow elongate segments, at the apex of which is the pro- 

 t-ensive ovipositor, the true eighth segment, which bears a pair of cerci. Both 

 sexes have wings; the venation is very variable within a species, more so than in 



