the Geomctriiia of the European fauna. 83 



This small ftimily is immediately derived from the 

 Mo)iocteiiiad(C, with which it is closely connected. It is 

 convenient, however, to keep it separate, and the peculiar 

 ohlique har connecting 8 with the cell towards base, 

 combined with the development of 5, distinguish it from 

 all other families. If there is any possibility of con- 

 fusion with those forms of Hijdriomenidcs in which 8 is 

 also connected by a bar (though in them the bar is 

 placed beyond and not before the middle of cell), the 

 absence of the characteristic areole of the lliidrio- 

 menidce will be a further test. 



Only a few genera, and these of small size, are known 

 to me, but they seem to be distributed impartially over 

 the globe ; perhaps rather more numerously in the Indo- 

 Malayan region than elsewhere. The two European 

 genera are not closely connected together, and have little 

 resemblance to each other. The origin of the group 

 must be sought in the neighbourhood of Heliothea, be- 

 tween which genus and Ortliostixis there is, in fact, a 

 close structural affinity, though little superficial simi- 

 larity. 



Tabulation of Genera. 



Posterior tibife without median spurs . . . . 43. Orthostixis. 



Posterior tibiae with all spurs present . . . . 44. Epirranthis. 



43. Orthostixis, Hb. 



Face rounded, or in <? sometimes strongly prominent, with 

 appressed scales. Tongue developed. Palpi moderate, porrected, 

 loosely scaled. Aiitennae in <? evenly ciliated. Thorax hairy 

 beneath. Femora glabrous ; posterior tibias without median spurs. 

 Fore wings with 10 anastomosing or connected with 12 and 9, 11 

 out of 10 between connections. Hind wings with 6 and 7 stalked 

 or separate. 



A small genus, confined to Southern Europe and 

 Central Asia ; it is nearly allied on the one hand to the 

 Indian Naxa, and on the other to Zandoptcryx, which is 

 principally Indo-Malayan and African. 



hremeraria, Stgr. 



calcularia, Ld. 



crihraria, Hb. 



renitidata,Jlh. 



g2 



