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Bulletin Wisconsin Natural History Society [Vol. 13, No. 2 
probable hypothesis) have got under the wrong label by want 
of room in a crowded drawer. The old drawer lable of de Selys 
bears in his handwriting the note: Type $ Mus. Brit. Georgia. 
This seems to imply that costalis is not represented in the 
collection. ” 
This leaves but the single type specimen as sole known repre- 
sentative of the species, marked by costal streaks of brown on 
all wings. The fact that the costal streaks are present on all 
wings marks this species as aberrant, since in Tetragoneuria the 
brown of the fore wing is confined usually to the extreme base, 
rarely reaching the first antecubital vein. On the other hand, 
it is not unusual in specimens of T. canis to have all of the wings 
flavescent, often with a slightly deeper flavescent tinge in the 
costal areas. It appears to me that an identity of this form 
with T. canis , as an aberration of the latter, is not a too far-fetched 
assumption. 
In this respect it is very unfortunate that the writer has not 
seen a single female of canis with a complete abdomen; in the few 
specimens seen by me the abdomen was inevitably lost. For 
this reason no absolute figures can be given as to relative length 
of appendages of female canis. Those mentioned are from the 
spinigera female, referred to canis by de Selys. 
After repeated study of the various literature and notes on the 
specimens of costalis, spinosa, and canis, I cannot rid myself of 
the impression of the possibility of an interchange of identities; 
namely, that what we have been designating as spinosa female 
may be canis female, and vice versa, with the true canis female 
lacking definite designation. If such an interchange could be 
shown (the suggestion is offered only as possible, not as probable), 
I believe that costalis would be found to fit in well with true canis 
females. It is difficult to offer any morphological grounds for 
this suggestion, especially as most of the literature lacks definite- 
ness as to critical points. 
T. diffinis Selys. This form has hitherto not been noted in 
the synonymy. Its characterization although vague when taken 
together with de Selys’ synonymical notes is sufficiently distinct 
to merit attention. 
T. cynosura simulans and semiaquea (pars). The synonymy 
of some of the forms is undoubtedly somewhat involved owing 
