45^ ENTOMOLOGICAL NEWS. [Dec, 'll 



white. The other Presidio female and the Atoyac female have 

 the pterostigma reddish and brownish respectively, but the tips 

 of the wings are not milky. All the Costa Rican females now 

 before me have the veins at the apices of the wings white but 

 in none of them is the membrane of the wing as milky as in the 

 first mentioned Presidio female which has the veins at the apex 

 brownish or blackish. My belief, as expressed in the Biologia, 

 p. 57, is that reddish and brownish pterostigmata in this species 

 indicate greater age than a white stigma. None of the Costa 

 Rican females before me have red or brown pterostigmata, al- 

 though two of the males have them dark brown. 



Judged by the length of the internal humeral ray there seems 

 to be no reason for separating the Costa Rican specimens from 

 the Mexican, and as milkiness at the apex of the wings of the 

 females is evidently not a geographical character, whatever else 

 its significance may be, I refer all the Costa Rican specimens to 

 mod est us. 



LITERATURE QUOTED. 



Backhoff, p. — 1910. Die Entwicklung des Copulationsapparates 

 von Agrion. Zeitschr. f. wiss. Zool., xcv. 



Balfour- Browne, F. — 1909. The Life-History of the Agrionid Drag- 

 onfly. Proc. Zool. Soc. London. August. 



Butler, H. — 1904. The Labium of the Odonata. Trans. Amer. Ent. 

 Soc. XXX. June. 



Calvert, P. P. — 1899. Odonata from Tepic, Mexico, with Supple- 

 mentary Notes on those of Baja, California. Proc. Calif. Acad. Sci. 

 (3) Zool. L May. 



Id. — 1907. Biologia Centrali-Americana : Neuroptera. London. 



Id. — 1910. Plant-dwelling Odonate Larvae. Ent. News, xxi, pp. 

 365-366. October. 



HiGGiNS, H. T. — 1901. The Development and Comparative Structure 

 of the Gizzard in the Odonata Zygoptera. Proc. Acad. Nat. Sci. Phila. 

 April. 



Latter, O. H. — 1904. The Natural History of some Common 

 Animals. Cambridge. 



Selys-Longchamps, E. de — 1886. Revision du Synopsis des Agrio- 

 nines Premiere Partie. Mem. Couron. Acad. Roy Belg. xxxviii. 



Ward, J. J.— 1910. The Life Story of a Dragon-fly. The Strand 

 Magazine. October. 



