DESCRIPTION OF THE SPECIES. 275 



ciency of my materials, I am unable to distinguish. The 

 description given in the first volume of these Monographs refers 

 to the specimen from Northern Wisconsin River. Another spe- 

 cimen from the same locality, much smaller and paler and with 

 less broad wings, has been mentioned in a note, appended to the 

 same description. The mention concerning the size of the spe- 

 cimen, however, has been omitted there. The drops on the wings 

 of that specimen arc larger and more rounded than in ordinary 

 specimens and show less tendency to form longitudinal rows; the 

 costal cell also contains such drops, while in the larger specimens 

 it shows at the utmost some pale drops along the auxiliary vein. 

 Nevertheless, even now, I would not consider this specimen but 

 as a variety of T. sparsa. 



Observation 2. — Wiedemann's collection contains at present, 

 under the name of T. sparsa, a pair of specimens, the communi- 

 cation of which I owe to the kindness of the Vienna Museum. 

 In the list of species sent to me, they were marked as coming 

 from Brazil. As Wiedemann prepared his description from a 

 single female of unknown origin, it seems hardly probable that the 

 female specimen now existing in his collection is the typical one. 

 It is more likely, on the contrary, that the couple of specimens 

 from Brazil now to be found in the collection was later added to 

 it by Wiedemann. Both sexes most closely resemble my Wis- 

 consin specimens, except that the wings are still broader, which 

 is caused by the greater breadth of the costal and stigmatical 

 cells ; their anterior margin is distinctly more convex. These 

 specimens seem therefore to belong to a South American species, 

 very closely allied to the North American one. However, my 

 conviction that such is the case has been somewhat shaken by a 

 number of specimens from Texas, collected by Mr. Belfrage. 

 The larger ones have the wings a little broader than the larger 

 specimens from Wisconsin, and the pellucid drops are less regu- 

 larly distributed ; the costal and stigmatical cells are not broader : 

 a small and incompletely colored specimen has much narrower 

 wings than the larger specimens; yet they are broader than the 

 wings of the above-mentioned smaller specimen from Wisconsin. 

 Whether the specimens from Wisconsin and Texas belong to the 

 same species, will have to be proved by further observation. 



Observation 3. — The present specie.-, together with T. rotun- 

 dipennis, as well as the species represented by the above- 



