REHN AND HEBARD 99 



the entire dorsal surface of the abdomen still shows traces of a de- 

 cided color pattern. 



Distribution. — ^The present species is known only from Magda- 

 lena Island, situated off the Pacific coast of Lower California in 

 25° N. Lat. 



Morphological Notes. — The half grown nymph shows the peculiar 

 development of the fastigium of the vertex more sharply pro- 

 nounced than in the adult, the former also has the genicular lobes 

 sharper and the dorsal abdominal segments more decidedly acute- 

 angulate produced mesad. The pronotum in this specimen, how- 

 ever, only mildly indicates the peculiar dorsal outline so decidedly 

 pronounced in the adult. 



Specimens Examined: 2; 1 male, 1 nymph. 



jNIagdalena Island, Lower California, March, 1889, (Chas. D. Haines) Id", 

 Icf n. Type, parahjpe. [Hebard Collection.] 



ARETHAEA St^l 



1870. EphippityLha Thomas (not of Serville, 1839), Proc. Acad. Nat. Sci. 



Phila., 1870, p. 76. 



1871. Ephippilylha Thomas (not of Serville, 1839), Prelim. Rep. U. S. Geol. 



Surv. Wyoming, p. 265. 



1872. Ephippityiha Thomas (not of Serville, 1839), Prelim. Rep. U. S. Geol. 



Surv. Montana, p. 445. 

 1872. Ephivpitytha Glover (not of Serville, 1839), lUustr. N. Amer. Entom., 

 Orth., pi. IX, p. 11. 



1876. Arethaea StM, Bihang till Kongl. Svenska Vetensk.-Akad. Handl., IV, 



no. 5, p. 55. 



1877. Aegipan Scudder, Proc. Boston Soc. Nat. Hist., XIX, p. 39. 



1878. Arethaea Brunner, Monogr. der Phaneropt., p. 234. 

 1885. Arethaea Bruner, Bull. Washb. Coll., I, p. 127. 



1891. Arethaea Brunner, Verhandl. K.-K. Zoolog.-botan. Gesell. Wien, 



XLT, p. 16. 

 1900. Arethaea Scudder, Proc. Davenp. Acad. Sci., VIII, p. 67. 

 1900. Dichopeiala Scudder (not of Brunner, 1878), Canad. Entom., XXXII, 



p. 331. 



1902. Arethaea Scudder and Cockerell, Proc. Davenp. Acad. Sci., IX, p. 52. 



1903. Arethaea Caudell, Proc. U. S. Nat. Mus., XXVI, p. 804. 



1904. Arethaea Rehn, Proc. Acad. Nat. Sci. Phila., 1904, p. 542. 



1904. Arethaea Caudell, Sci. Bull. Brookl. Inst. Arts and Sci., I, no. 4, p. 



114. 



1905. Arethaea Rehn and Hebard, Proc. Acad. Nat. Sci. Phila., 1904, p. 795. 



1905. Arethaea Isely, Trans Kansas Acad. Sci., XIX, p. 245. 



1906. Arethaea Kirby, Synon. Catal. Orth., II. p. 443. 



1907. Arethaea Rehn, Proc. Acad. Nat. Sci. Phila., 1907, p. 61. 

 1907. Arethaea Rehn, Ibid., 1907, p. 74. ^ 



TRANS. AM. ENT. SOC, XL. 



