332 NORTH AMERICAN TRYPETINA. 



America, although wanting in Europe, are found to be closely 

 related to European forms. 



Subgenera with a small number of species, occurring in Europe 

 and wanting in North America, are: 1. Platyparea (two species; 

 the larva of the typical PI. pceciloptera lives in the stems of 

 Aspa?'agus officinalis) ; 2. Euphranta (one species, on Asclepias 

 and Vincetoxicum) ; 3. Hemilea (one species); 4. Hypenidium 

 (one species) ; 5. Chselostoma (one species, distinguished by the 

 bristly sides of the face) ; 6. Anomcea (one species, in the fruits 

 of Crataegus) ; 7. Zonosema (two species, related to Rhagoletis ; 

 in the fruits of Rosa and Berberis); 8. Rhacochlsena (one 

 species) ; 9. Myopites (several, but as yet not well separated 

 species; the larvae live in the flowers of Inula and of the related 

 genera) ; 10. Sphenella (one species ; larva? in the flowers of 

 Senecio). If we accept the sufficiently well-founded division of 

 the genus Oedaspis, in Oedaspis and Orellia, we have, moreover: 

 11. Orellia (three species; one on Bryonia, another on Zizy- 

 jjhus), to add to those small European subgenera, which have no 

 representatives in North America. 



The subgenera peculiar to North America, but allied to some 

 European forms, are : the subgenera Straussia and Oedicarena, 

 which resemble Spilographa ; Epochra and Stenopa, which 

 stand very close to Acidia; Aspilota, Plagiotoma, and Peronyma, 

 wdiich all approach Trypeta ; Icterica, related to Oxyphora ; and 

 finally Eurosta, closely allied to some species of Oxyna. 



Such are the differences between the two faunae ; I will now 

 show the resemblances, as far as observed, between them. 



The most striking coincidence and the most remarkable for the 

 great number of analogous species, between the two faunas, 

 occurs within the circle of relationship of the European species 

 belonging to the subgenera: Carphotricha, Oxyphora, Oxyna, 

 Tephritis, Ensina, Urellia. Another point of coincidence of the 

 same kind, although less well represented as to the number of 

 species, occurs within the closely related subgenera Spilographa, 

 Acidia, and Rhagoletis. A third one may be noticed within the 

 genus Oedaspis. Moreover, the North American species of the 

 subgenera Trypeta and Aciura, a single one in each, are very 

 much like European species of the same subgenera in their general 

 appearance. Two species, common to both continents, have, 

 until now, been ascertained : Trypeta jiorescentiee (living on 



