Kb. Miller et Ma. Ivie, ENALLAGMA OPTIMOLOCUS, A NEW SPECIES OF DAMSELFLY FROM MONTANA (ODONATA, COENAGRIONIDAE), Proceedings of the Entomological Society of Washington, 97(4), 1995, pp. 833-838
Enallagma optimolocus n. sp. is described and diagnosed from streams i
n western Montana. Garrison's 1984 key is modified to distinguish this
species from the related E. carunculatum Morse and E. civile (Hagen).
The competing aspects of two views of these specimens, i.e. full spec
ies or hybrid individuals, is discussed. The occurrence of E. caruncul
atum and E. anna Williamson at the collecting sites is noted. The abse
nce of E. civile from the areas surrounding the range of E. optimolocu
s is noted, with Roemhild's 1975 (and Garrison's 1984) record of E. ci
vile for Flathead Co., Montana, corrected to E. carunclulatum. Illustr
ations of diagnostic features for the species are given.