42 LLOYDS NATURAL HISTORY. 



b. {Nyctakmon^ Dalm., Nyetalemohida^ Guenee). Palpi 

 with the terminal joint long, slender, and pointed. 



* Each of the veins of the hind-wings produced 

 into a short scallop ; post-costal vein of fore- 

 wings wanting the second branch. Genus 

 ALCIDIA, Westw. ; type, U. orontes. 



** Hind- wings with the second and third branches 

 of the median vein produced into a long 

 tail. Genus LYSSIDIA, Westw. ; type, U. 

 patroclns. 



B. (Scmatwida, Guenee.). Fore-wings with the upper discoi- 

 dal vein arising at a short distance beyond the discoidal 

 cell, between the cell and the origin of the second branch 

 of the sub-costal vein. 



a, Discoidal cell of the hind-wings terminating at a 



distance before the emission of the first branch of 

 the median vein. Genus MANIDIA, Westw. ; 

 type, U. lunus. 



b. Discoidal cell of the hind-wings extending nearly to 



the emission of the third branch of the median 

 vein. Genus CORONIDIA, Westw.; type, U.orithea. 



Both the larvae and perfect insects differ considerably in 

 structure and appearance, even without extending the limits of 

 the Family to include a number of forms which have hitherto 

 been included in the Geometra, as some recent authors have 

 proposed. I therefore propose to divide the Cydimonida 

 into three Sub-families, the CydimonincB^ Nyctakmonincz, and 

 Coronidiina, each containing two very distinct genera. West- 

 wood has incorrectly represented the wing-cells of several species 

 as open, but they are really closed by a more or less atrophied 

 nervule. 



