Hagen.) . 990 [J anuary 22, 
teryx maura Pict. (Harris determ.) Milton, palings, in the day time, 
May, 1821; March 15, 1822; Cambridge, March 1, 1835; April 9, 
1835; March 30, 1855; Maine, Randall; Alabama, Feb., Hentz. 
There are three fragments in the collection, one from Maine, the 
others probably Cambridge. One specimen has thorax and head; 
probably all belong to T. maura. 
12. Nemoura perfecta? Walker. 
No. 23. Nemoura debilipennis Say Mss., (Say’s determ.). Dublin, 
N. H. Mr. Leonard. 
This specimen is marked lost by Harris, but another from Maine, 
Randall, 1836, is added with the remark: “I refer this species to 
this number doubtfully.” A small Nemoura, in tolerable condition, 
perhaps Walker’s species. 
Harris’ catalogue includes for Perlina ten numbers, belonging to 
twelve species, none of them to be considered as types of a described 
species. ‘The twenty-three specimens are only fragments. 
EPHEMERINA. 
1. Ephemera decora Walk. Hag. Syn., 28, 1. 
No. 82. Ephemera (Baetis) maculipennis Harr. 9 imago. 
No. 84. Ephemera maculata Harr. ¢ subimaeee both from Maine. 
Randall, 1836. 
2. Ephemera natata Walk. She Syn., 39, 4. 
No. 82. Eph. maculipennis Harr. & oriimecc. 
No. 83. Eph. (Baetis) maculatus Harr. ¢ subimago; both from 
Maine, Randall, 1846. 
The two species are united in the monograph by Mr. Eaton, with 
E. simulans Walk. and E. guttulata Pict. Not having now the oppor- 
tunity to examine again the types, I can say nothing, besides my 
notes made in the British Museum. The types of Eph. Hebes were 
wanting even in 1857 in the collection. The type of E. decora, 
a File, I believed to be identical with my EH. decora from New 
Haven, Conn., but it measured twenty-eight mm. in the expansion 
of the wings, and my type only twenty-six mm. The type of E. sim- 
ilans is a male subimago, (as I presumed in my visit in London, 1861, 
and not a female as I stated in my Synopsis). The type of Pal. 
notata, a female subimago, I believed identical with my specimen from 
Chicago. Neither Mr. Eaton nor I examined Pictet’s type, a frag- 
