1911] Muttkowski, studies in Tetragoneuria. 129 



Maine, June 10, 1898, Harvey; coll. Williamson. 



Same as above. 



Same as above. 



Go Home Bay. Out., July 4, 1907 ; coll. Walker. 



Manchester, Me., June 9, 1898, Miss Wadsworth ; 



U. S. N. M. 

 Same as above. 

 Same as above. 

 Same as above. 

 Same as above. 

 Osweg-o, N. Y., May 18, 189.5; IT. S. N. M. 



This species is more easily distinguished than any of the pre- 

 ceding, notably by the male appendages which have an inferior 

 spine, and by the female vulvars which approximate each other 

 also by the female appendages which usually reach a length of 

 2.7 to 3 mm. 



Specimen No. 19 is an aberrant form. Briefly described : All 

 antenodals of the hind wings as well as the nodus itself edged 

 with brown. The costal field to the stigma in oblique view shows 

 a decided flavescent tinge on all wings. Furthermore, there are 

 blackish, widening streaks in the upper half of the wings as 

 follows : A streak beginning at the first antenodal and reaching 

 to the nodus at which place the streak is widest ; a second streak 

 beginning at the first postnodal and reaching to the distal end of 

 the stigma, being widest at the proximal end of the stigma. This 

 shading is not pronounced, having more the appearance of a black 

 veil covering the wings than any decided coloration. Though 

 the specimen is unique it would hardly be fair to give it a name, 

 since in all other respects it agrees with the general spinigera 

 type of coloration. 



Under this falls indistincta Morse. I had already placed it here 

 when Dr. Calvert sent me the following notes in a recent letter 

 (May 20, 191 1) : 



