1873.] 265 [Hagen. 
Mass., is the most southern limit known. The variety L. prenuhbila is 
more rare, and, as in Europe, stronger developed in the female. ZL. 
semifasciata is a decidedly more southern species, and it is remark- 
able, that Stow, Mass., is its most northerly limit known. 
7. Libellula exusta Say. Lib. Julia Uhler, Hag. Syn., 153, 7. 
No. 55. 6. Lib. exustus (sic) Say mss. (Say’s determ.) Dr. 
Smith, Sutton. 
Say, loc. cit., 29,18, describes only the male, and adds, “I have 
not seen the female.. From Dr. Harris.” The specimen in the 
collection is also surely a typical one. Libellula Julia Uhler (Hag.) 
is identical with LZ. exusta. When Mr. Uhler described his species 
only one specimen in bad condition from Ft. Steilacoom, Puget 
Sound, was known. Later the species was discovered in Racine, 
Wis., and in Massachusetts, and its identity stated by Mr. Uhler. 
The western and northern specimens from Puget Sound, Lake Winni- 
peg, and even from Maine are larger, the basal longitudinal spots on 
the wings smaller, in the posterior wings not covering the triangle. 
The mature.male has the thorax above bluish, and the abdomen, ex- 
cept the apical half, always blackish. ‘The typical Lib. exusta has 
two pale bands on the thorax, which are not bluish in the adult; the 
abdomen entirely bluish; the basal longitudinal spots reaching the 
arculus and filling the triangle in the posterior wings. Nevertheless 
Iam unable to discover specific characters, and consider both forms 
as belonging to the same spccies. Indeed I was at one time inclined 
to consider the southern and smaller L. deplanata Rbr. as belonging 
to the same species, just as we find sometimes in Sicily common 
northern European species, cnly half size. Buta more detailed ex- 
amination gives some differences in the genital parts, which I con- 
sider of importance enough to separate the two species. 
The left hind wing of the male in the collection shows a rare and 
interesting monstrosity in the formation of the triangle. 
8. Libellula deplanata Rbr. Hag. Syn., 154, 10. 
No. 56. Dr. Smith, Sutton. Var. ?, Mr. Nuttall, Pennsylvania. 
The specimen from Sutton is no longer in the collection ; the variety 
is the true LZ. deplanata. Uarris seems to have doubted in the same 
manner as I have if the two species are really different. It is worthy 
of remark that ZL. exusta is the representative species of the Europ- 
ean L. fulva in North America. I have never seen specimens of L. 
deplanata from Massachusetts ; Pennsylvania is now the most north- 
ern limit. 
