W. L. MC ATEE 201 



KEY TO THE NEARCTIC SPECIES AND VARIETIES OF 



ERYTHRONEURA 



(HOMOPTERA; EUPTERYGIDAE) 



BY W. L. MC ATEE 



The present treatment of the genus Erythroneura Fitch differs 

 from the preceding revision, that of Gillette in 1898/ in the fol- 

 lowing points: the genus is recognized as distinct from Typhlocyba 

 Germar- and the species, all of which Gillette included in the 

 latter group, are distril^uted according to their characters; two 

 species referred to other genera are omitted (Empoa coccinea 

 Fitch to Empoasca, fide Van Duzee and Ball, and Typhlocyba 

 sanguinea Gillette and Baker to Dikraneura, fide Van Duzee) ; 

 the composite species Typhlocyba comes Say (embracing forms 

 with three different types of venation, not to speak of radically 

 different color patterns) is divided into six species and probably 

 should be further subdivided; and four new species and thirty- 

 eight new varieties are described. 



Some reference is made to every Nearctic form in the literature, 

 except Erythroneura ruhricata Van Duzee which I have not seen. 

 It may be mentioned here that Typhlocyba tunicarubra Gillette 

 and Empoa albicans Walsh, forms about which there might 

 otherwise be some question, belong to the genus Typhlocyba s. s. 



Erythroneura is the most intricate of the Nearctic Euptery- 

 gidae, in the relations of its species and especially of its color vari- 

 eties, and in making determinations all characters require atten- 

 tion. First as to recognition of the genus: there are no ante- 

 apical cells in the tegmen, and the membrane is not appentliculatc; 

 there is no submarginal vein in the wing, and there are two ap- 

 ical wing cells, the first and second wing-veins l^eing confluent. 

 Finally separating it from Typhlocyba, which agrees with it to 

 this point, the fourth (inner) apical vein of tegmen terminates in 



iProc. U. S. Nat. Mus. xx, pp. 7.50 to 77:3. 



^For discussion of this subject see Proc. Biol. Soc. Wash., xxxi, j^p. 109 tc 

 124, Nov. 29, 19 IS. 



TRANS. AM. ENT. SOC, XLVI, 



