404 Dr. Hagen's and the Kev. A. E. Eaton's 
Page 143. Heptagenia Jlqvescens. Your figure of the 
forceps is not very correct. 
Page 145. Heptagenia elegans. [The following is 
probably the subimago.] Ephemera citrina, Hummel, 
1825. 
" Ephemera citrina, cauda biseta, flava, alls flavissimis- 
posticis margine nigricante." 
Descr. — " Statiu-a et similitucline Eph. hioculatce sed 
major, et ala3 coloratje. Caput flavum, oculis nigris tuber- 
culis luteis. Thorax flavus, luteo-variegatus. Abdomen 
flavum, linea longitudinali et strigis transversis fuscis, 
segmentis duobus ultimis albidis. Seta) corpore duplo 
longiores, albidte fusco-annulatoB. Alse reticulatfe citrinas 
parum hyalinte, anteriores margine antico obscuriore ; 
posteriores margine postico nigricante. Pedes flav^e lon- 
gitudine ajquales. Long. corp. setis exceptis 5 lin. Alae 
anticaj 2 lin. Habit. Petropolis." 
[In the foregoing description I may observe that Eph. 
bioculata probably stands for bioculata, Rom., i. e., H. 
elegans; "caput . . . tuberculis luteis" most likely 
refers to the rhomboidal spots near the eyes above ; and 
the last two segments of the abdomen of H. elegans are 
often pale oclu-eous above.] 
Page 146. Heptagenia fluminum. [To synonyms add 
(?) E. speciosa, Pod. 1761 : and refer to Note to Mon. 
p. 120, No. 2.] 
Page 151. Heptagenia venosa. According to your 
figure of the forceps and your description, my species is 
identical with yours. Fabricius has in all his foiu* works 
the diagnosis of his species in precisely the same words. 
In Sp. Ins. he adds the citation from De Geer. The 
description of De Geer is long, and contains nothing to 
oppose the identification of his species Avith that of Fabri- 
cius, wlio gives Denmark as a locality. JMiiller makes 
no mention of the species, unless it be the altogether in- 
sufficiently described E. gemmata. Villers names the 
species E. nervosa, but does not state Avhy he did this. 
Burmeister's short diagnosis corresponds, if the " subtus 
ochracea" is De Geer's " subtus gnsea ;" only the abdomi- 
nal segments " basis ochraceis " are not mentioned by 
De Geer. The dimensions agree, and Curtis's B. dispar 
