HOWE: NEW ENGLAND ODONATA 131 
140. Agrion d. apicale, eastern, spring. 
141. Argia translata, east-central. 
142. Enallagma pictum, eastern, summer (?). 
143. Enallagma traviatum, east-central, summer. 
144. Cordulegaster erroneus, eastern, only one record, — Connecticut. 
145. Gomphus pallidas, east-central. 
146. Tetragoneuria semiquaea, eastern, — one British Columbia record. 
147. Perithemis domitia tenera, east-central, and Arizona, spring, summer 
and autumn. 
148. Celithemis eponina, east-central, summer. Recorded from Ontario. 
149. Tramea Carolina, east-central, — northern stations cold bog-ponds, 
spring, summer and autumn. Recorded from Ontario. 
The following thirteen typically southern species occur only along 
the coast as far north as Provincetown, and rarely to Cape Ann. 
Erythrodiplax herenice is reported also from Quebec. 
150. Enallagma doubledayi, eastern, summer and autumn. 
151. Enallagma durum, east-central, — littoral, summer. 
152. Ischnura ramburi, east-central, — littoral, summer and autumn, largely 
confined to the brackish marshes. 
153. Progomphus obscurus, traascontinental, summer, — largely confined to 
the outwash ponds of the Cape. 
154. Anax longipes, eastern, svunmer. 
155. Libellula auripennis, east-central, — littoral, surrimer and autumn. 
156. Libellula cyanea, east-central, spring, summer and autumn. 
157. Libellula vibrans, east-central, summer. 
158. Erythrodiplax berenice, east-central — httoral, summer — largely con- 
fined to the l)rackish marshes. 
159. Erythemis simplicicollis, transcontinental, summer and autumn. 
160. Pachydiplax longipennis, transcontinental, spring and summer, and early 
autumn. 
161. Celithemis monomelaena, eastern, summer. 
162. Tramea lacerata, transcontinental, autumn. 
The next species, and the only typically tropical one, which evi- 
dently reached Nantucket accidentally, probably by being blown 
up frona the South by the prevailing summer winds, is 
163. Tramea abdominalis, eastern, summer. After days of such winds the 
Portuguese-man-of-war not uncommonly is found along the southern 
beaches of Cape Cod carried north not alone by the ever present Gulf 
Stream. 
164. Tetragoneuria costalis, for which there is one record, is at best a doubt- 
ful species. 
