130 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY 
The following five species are like the last except that they are 
only eastern in range. 
118. Lestes vigilax, eastern, spring, summer and autumn. 
119. Enallagma aspersum, eastern, summer and autumn. 
120. Aeshna verticalis, eastern, summer and autumn. 
121. Tetragoneuria cynosura simulans, eastern, spring. 
122. Celithemis ornata, eastern, — littoral, summer. 
The following thirteen east-central or transcontinental species 
inhabit the low hill country up to 200 to 500 feet elevation, but do 
not cross the interlobate moraine on to Cape Cod. Several reach 
occasionally the St. Lawrence Valley in Canada, and all but the 
two noted are rare or absent in Maine. 
123. Enallagma divagans, east-central, spring(?). 
124. Enallagma geminatum, east-central, spring, summer and autumn. 
125. Enallagma vesperum, east-central, spring, summer and autumn. 
126. Ischnura kellicottii, east-central, summer. The Block Island record 
would perhaps prove its relation with the species affected by the Buz- 
zard's Bay lobe, if such a correlation in distribution exists at all. 
127. Anomalagrion hastatum, east-central, spring. 
128. Tachyopteryx thoreyi, east-central. 
129. Nasiaeschna pentacantha, east-central, spring. 
130. Epiaeschna heros, east-central, spring and early summer. 
131. Didymops transversa, east-central, spring and early summer. These 
two species (130, 131) probably occur on Cape Cod and belong with last 
group. They are not uncommon in Maine. 
132. Neurocordulia obsoleta, east-central, summer. 
133. Libellula luctuosa, east-central, spring, summer and early autumn. 
134. Sjrmpetrum ambiguum, east-central, only one record. 
135. Pantala fiavescens, cosmopoUtan, summer. 
The following four species are like the last, but are only eastern 
in range. 
136. Gomphaeschna furcillata, eastern, spring. 
137. Aeshna mutata, eastern, one record only. 
138. Somatochlora linearis, eastern, but two records. 
139. Tetragoneuria morio, eastern, spring. 
The following ten eastern or east-central species regularly in- 
habit southern New England, extending inland to the lower hill 
country (200 ft.), and some find the northern limit of their range 
in the cold-bog (primitive) ponds which present an even annual 
temperature. Only the last three species are known on Cape Cod. 
