ORTALID^I SYSTEMATIC DISTRIBUTION. 65 



TIMIA, EMPYELOCERA, and ULIDIA occur in Asia together with 

 other species, peculiar to that part of the world. CHRYSOMYZA 

 demandata likewise ranges over a considerable part of Asia and 

 Africa; both countries contain besides species of this genus 

 peculiar to them. 



The South American Ulidia stigma Wiedeinann and the 

 Brazilian Ulidia bipunctata Macq. are not Ulidise at all, 

 although they probably belong to the group Ulidina, the first to 

 the genus Notogramma, the last to Euxesta. Ulidia metallica 

 Bigot, from Cuba, is perhaps a Chrysomyza; as to the Ulidia 

 fulvifrons Bigot, from the same locality, it is impossible, from 

 Bigot's description, to come to any conclusions about its place in 

 the system. 



America seems in general to be very rich in forms belonging 

 to the Ulidina. For the species which came within my knowl- 

 edge I have established the genera: DASYMETOPA, OEDOPA, 

 NOTOGRAMMA, EUPHARA, ACROSTICTA, EUXESTA, CH^ETOPSIS, 

 HYPOECTA and STENOMYIA. 



The species described by former authors, which belong in the 

 circle of the above-mentioned genera, are to be found in Wiede- 

 mann partly in the genus Ortalis, partly in Ulidia. In Macquart, 

 as far as I can ascertain, they are scattered among the Ulidise 

 or even in Ceroxys and Urophora, which shows, on that author's 

 part, an utter neglect of their plastic characters. The genus 

 E*JMETOPIA established by Macquart in his family Psilomydee, 

 does not belong to it, but to the Ulidina. 



It is not doubtful at all that Asia and Africa, besides the 

 genera which they have in common with Europe, harbor some 

 genera of Ulidina which are peculiar to them. GORGOPIS 

 Gerstascker, described by Doleschall, some time previously, under 

 the inappropriate name of Zygsenula, probably belongs to this 

 group. It differs, it is true, from all the known Ulidina very 

 much ; still the structure of the head in Oedopa may be indicative 

 of an affinity. 



Unfortunately I cannot give any further information concern- 

 ing other exotic Ulidina of the old world, as I have none in my 

 possession. The existing descriptions of a number of Ortalidx 

 which may possibly belong to the group Ulidina, are not accurate 

 enough to admit of any positive conclusions. 



I have not met with any Ulidina from Oceanica yet. 

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