212 ROYAL SOCIETY OF CANADA 



with black and shadeid externally with white; between the second and 

 third median veins is a small red lunule one-third the size of the last, 

 shaded externally with white. 



The specimen here described and figured has no tails to the 

 secondaries, but, from the appearance of the ends of the veins and the 

 marginal pattern, as well as the presence of a few longer scales at the 

 end of the first median vein, I have no doubt that originally tails 

 existed. 



On the primaries the ovate blotches are bordered on each side by 

 a broad band about two-thirds their own width, and darker than the 

 ground colour of the wings. On the secondaries the series of square 

 blotches is ou)tlined on both sides by an almost black angulated line. 

 Beyond the cell on all the wings is a large, dark, oWong quadrate 

 blotch; the fringe on all wings is dark. Eyes ringed with pearly 

 white; palpi white, tipped beneath with black; antennge black, ringed 

 with white; club orange below and at the tip. 



Locality. — The type was taken by Mr. E. Firmstone Heath near 

 his home in the picturesque valley of the Long Eiver, a few miles from 

 Cartwright, in Southern Manitoba. This spot is about ten miles north 

 of the boundary of North Dakota and about twenty-five miles north- 

 east of the Turtle Mountains. This valley, near Mr. Heath's house, 

 is about a mile wide and is well wooded with scrub oaks {Quercus ma- 

 crocarpa), ash-leaved maples (Acer Negundo), aspen and balsam poplars 

 (Populus iremuloides and P. lalsamifera) , Saskatoon-berry {AmelancMer 

 alnifolia), Avhite thorn (Cratœgus coccinea), wolf -berry (Symplioricarpus 

 occidentalis) , prairie roses, wild plum {Prunus nigra), a few American 

 elms, choke-cherries and various willows. Mr, Heath tells me that it 

 was taken in July about twenty-five years ago, and, although he has 

 been keenly on the look out ever since, he has never seen another 

 specimen. It is a remarkable form, and, as will be seen from the 

 accompianying plate, which is an excellent representation, bears very 

 little resemblance to any described species. 



The species of Thecla occurring at Cartwright at the season T. 

 heathii was taken, are T. acadica, T. calanus, T. strigosa, var. liparops, 

 and T. titus. The pattern of the underside of the insect here de- 

 scribed in no way resembles that of any of these, and I can hardly 

 think that it is a suffused albinic variety of any of them. 



The type which was generously presented to me by Mr. Heath, after 

 wihom it is named, is deposited in the United States National Museum 

 at Washington. The painting from which the figure in the plate was 

 made, is in my own collection. 



