376 PROCEEDINGS OF THE ACADEMY OP 



with fuscous, aud the hind edge of the wings ciliated. The hind wings are 

 paler, arid tipped with fuscous. 



Length J* 58 mill. ; 9 68 mill. Alar exp. tf 1820 mill. ; O 1923 

 mill. Seta $ 1013 mill. ; 9 813 mill. Ant. leg J* 6 J mill. ; 9 (same 

 size) 6 mill. Ten tf, seven 9 



Palingenia terminata, n. sp. tf When alive this insect is generally distin- 

 guishable from the above by the eyes being yellowish, not pearly whitish. 

 The dried specimen differs as follows: The color is yellowish. The parts 

 which are ferrugino-piceous in pulchella (imago), even immediately after 

 moulting, are almost always ferruginous or luteous ; the meso- and meta-tho- 

 racic scutella are sometimes tipped with white, but rarely entirely white ; the 

 lateral dots of the abdomen are always absent ; the sternum is almost always 

 immaculate ; the medial band on the four posterior femora is generally obso- 

 lete ; the cross-veins are scarcely coarser than the veins, giving the wings a 

 paler appearance ; and generally there is discoverable on the second costal 

 vein the same short streak found in jiavescens, which is only seen in a single 

 $ pulchella. Two somewhat immature specimens are almost entirely whitish, 

 except that the vertex is partly ferruginous, and there is a ferruginous cloud 

 on the tip of the abdomen. 



The 9 is scarcely distinguishable from 9 pulchella but by the yellowish 

 color, the absence of the lateral dots of the abdomen, and the frequency of the 

 streak on the second costal vein. 



Length q 71 6^8 mill. ; 9 8 SJ mill. Alar exp. 9 18 21| mill. ; 9 23 

 25 mill. Seta (j> 1922 mill. ; 9 1822 mill. Ant. leg ^ 10 mill.; 9 

 (same size) 7 mill. Twelve ^, five 9- 



The (J 1 9 subimago differ from tf 9 imago, as in pulchella. They are 

 scarcely distinguishable from the subimago of pulchella, except by the absence 

 of the lateral abdominal dots. 



Length tf 6h1 mill. 9 6 \ 8 mill. Alar exp. $ 1920 mill. 9 21 A 24 

 mill. Seta $ 1213 mill. $ 1518 mill. Ant. leg $ 9 (same size) 5^ mill. 

 Two cJ 1 ; two 9 . 



Ephemera. 



Ephemera decora ? Walker Catal. $ Piceous. Seta of antenna? pale 

 at tip. Sternum a little varied with luteous. Abdomen luteous, each seg- 

 ment with a broad lateral dusky vitta, emarginate on its four sides and con- 

 fluent at its four angles with the adjoining ones, towards the tip of abdomen 

 almost entirely confluent ; venter similarly marked ; anal processes and setse 

 pale obscure greenish, the latter regularly incised with fuscous, and the inter- 

 mediate one slightly the shortest. Anterior legs pale greenish, the femora, 

 base and tip of tibia and tarsal incisures and tips, fuscous ; four hind legs 

 pale greenish, with only the tips of the tarsi fuscous. Wings hyaline ; veins 

 and cross-veins moderate, subequal, fuscous ; the cross-veins irregularly bor- 

 dered with fuscous, except on the extreme tip and the posterior margin ; on the 

 basal disc of the wing, and transversely from the middle of the costa nearly to 

 the hind margin, these borderings become confluent, so as to exhibit a spot and 

 a semi-fascia, both of them irregular in outline ; on the costa they are wider, 

 towards the tip of which there is a pale brownish cloud ; the hind wings are 

 lightly tipped with fuscous. 



The 9 has a very high and acute carina, divaricate and extending from 

 the occiput to the orbit of the posterior ocellus ; in the $ this carina is not 

 so obvious. The sternum is paler. The lateral abdominal vittaj are not 

 nearly confluent from joint 2 to joint 6 ; and on the venter they are reduced 

 to an abbreviated line. 



Length $ 10 mill. 9 13 mill. Alar exp. $ 2325 mill, 9 27 mill. Seta' 

 r? 25 mill. Q 15 mill. Interm. seta tf 2021 mill. 9 13 mill. Ant. leg J 1 

 12 mill. 9 6 mill. Two <?, one 9. 



[Sept, 



