SYNOPSIS OF THE BRITISH EPHEMERID^. 35 



On investigating the Stephensian types I referred C. alhi- 

 penne to the male, though the " nigrum" of the thorax does 

 not agree ; C. nnicolore, Stephens, agrees for the female, as 

 also does C. hyalinatum. According to my notes the female 

 is also placed amongst C. virgo, Stephens (70, 8). The 

 type of B. striata^ Stephens, Q^y 11, should also be the 

 female of a Cloeon, but I cannot express any further opinion. 

 The description, however, most decidedly indicates a male, 

 and that of a species very near to C. bioculafum, if it be not 

 identical; J3. autumnalis, Curtis, Phil. Mag. 121, 11 b, of 

 which the description is quoted by Stephens (67, 17) might 

 perhaps be i-eferred here. 



I have before me some few sub-imagines of Cloeon^ which 

 I cannot refer to any of the above five species described. 

 But it appears to me it would be unwise to construct from 

 them new species before the imago is known. 



P. S.— Whilst correcting the proof sheets I learn with regret that the 

 first investigator of British Ephemera, John Curtis, is no more. The 

 unsurpassable accuracy and like-life execution of his drawings will always 

 secure for him a high rank in science. The examination of details, to 

 which Entomology owes its greatest progress, was practised by him in a 

 comprehensive degree, and to some extent thoroughly. As in the case 

 of his great predecessor, Savigny, his eyes too truly used refused their 

 further services, for Isis allows us not to glance behind her veil with 

 impunity! It is to be hoped that his Collection, like that of Stephens, 

 will be preserved for the purposes of science. To English Naturalists 

 its loss would be irretrievable. 



H. A. H. 



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