37 







arc seldom found in open grass-lands, as with the Nbctuidce, excepl a few 

 species, chiefly Larentinte, which gather about houses. In Maine, where I have 

 observed them for many seasons, the geometrid moths begin to appear during 

 the last week in May, when Lozogramma defluaria begins to appear in dry, 

 open fields near pine-woods, and soon after Nemoria grataria, Fidonia nota- 

 taria and truncafaria, Corycia vestal into and semiclamta, lead off the hosts 

 that soon follow. During the last of May, Plemyria jluviata and Ochyria 

 designata and ferrugata enter houses, attracted by the light. About the 

 middle of June, the Ennomincc begin to appear, and are most abundant late 

 in June and in July in hard-wood forests. During the middle of June, the 

 species of Cymatophora {fioarmid) and Tephrosia also appear in pine-woods, 

 often clinging to the trunks of trees in shady places. 



In Massachusetts, the season opens a week earlier, and in the Middle 

 States a week or two still earlier. In Colorado, June and July are the 

 best collecting-months. In Vancouver Island, Mr. Crotch collected with 

 great success in July. In California, the winter-months and March are good 

 collecting-seasons. 



I have not attempted in this essay to generalize the times of appearance 

 of our geometrids, but to carefully give, so far as I have been able, the dates 

 of capture in connection with the localities. 



§ IO.-^Development op the thorax of the imago. 



The following observations relate to the development of the different 

 parts composing the segments of the thorax in a Tineid moth. They were 

 made many years ago on the larvae of a Tineid moth, found in the nest of 

 Odynerus albophaleratus. The caterpillars had been paralyzed by the sting 

 of the wasp, and, though incapable of motion, in one or two cases had sufficient 

 vitality to pass into the pupa state. Some of the drawings were made from 

 life by myself; others, from alcoholic specimens, by Mr. Emerton. Unfor- 

 tunately, the specimens have been lost, and the following description is accord- 

 ingly drawn up from the sketches, which represent the specimens just as 

 they appeared, with the pupal integument showing very plainly through the 

 thin, tense, larval skin. The species to which the larva belonged is unknown. 

 It was a green caterpillar, of the usual form, and seemed to be a Ti»' ,: ' 

 rather than a Tortricid. 



, Fig. 1, la, (pi. 7), side-view, shows the first stage of the sen 



