March, 1917.] FORBES : HydRIOMENIN.E OF THE UnITED StATES. 61 



Meyrick is available for this group, but Meyrick fails to mention the 

 middle discocellular veins and I have seen no material of H. ruhro- 

 punctaria. Baptria tibiale, generally associated with Polyfhrena on 

 account of its markings will also run here, but its bluntly rounded 

 wings and black ground-color are distinctive. I would hardly dare 

 venture a guess as to its true position, but it has always been asso- 

 ciated with the Polythrenas. 



33. Asthena has two accessory cells and is general in the old 

 world. Minoa differs in its yellow color, and herbaceous food-plant, 

 but there seems no tangible difference in structure. 



34. A variant of Xanthorhoe, with which it is connected by an 

 extensive Australasian group ranging into Europe. 



35. Latirupta and fluviata are congeneric, in fact closely similar, 

 though the sexual difference is less striking in the former. I should 

 also include H. excurvata. Multiferata lacks the characteristic wing 

 form and is quite isolated. It lacks coremata, and so would go better 

 here than in the Xanthorhoe group of Hydriomena. There seem to 

 be close relatives in South America. The genus is world-wide, espe- 

 cially P. fluviata, and species connecting it with Hydriomena occur 

 in both hemispheres. 



36. The typical species of these three genera are distinct enough 

 but there is a complete series of intergrades. Orthonama has equal 

 accessory cells, scalloped hind wings and a rather crowded radial sys- 

 tem in the fore wing, Vitalhata, intestinata, gillettei and rectilineata 

 are typical, but classicata, vancouverensis and qrccfii are Eupithecias 

 except for the two subequal accessory cells. In typical Eucymatogc 

 the first accessory cell is minute,. perhaps subject to individual varia- 

 tion ; our species are anticaria and tenuata. Eupithecia has a single 

 accessory cell, evenly rounded wings, radial system so spaced that the 

 distance from the costal edge to the stem of R3 and ^ is much wider 

 than the ordinary distance between two veins in the lower part of the 

 wing, and the clypeus is often extended in a point as in the common 

 eastern E. miserulata. 



I believe the dorsal tufts are constant in perfectly fresh specimens 

 and outside of India the similarly marked wings with fine wave-lines 

 are characteristic. The tufts are usually black, but white and con- 

 colorous in E. cretaceata. Superficially H. stellata is similar, but the 

 black dots on the body are subdorsal. 



