1985.] ENTOMOLOGICAL NEWS. 239 



ODONATA-A NOTE AND A DESCRIPTION. 



By Prof. D. S. Kellicott, Columbus, Ohio. 



In his paper,* the Odonata of New York State, Mr. Calvert 

 says that " Diplax obtrusa probably lives in New York." I am 

 able to confirm the truth of this inference as I have taken it 

 several years in succession in Hastings, Oswego County ; in 

 August and September I have found it quite as abundant as 

 D. rubicundula. 



In the "Catalogue of the Odonata of Ohio,"t I gave an 

 account of the habits, localities in which it had been taken, and 

 a description of the female of a species of Enallagma which I had 

 mistaken for Enallagma divagans. All that is said in that article 

 refers to the species described below and not to divagans. I 

 hav€ obtained examples of the latter and compared the two. 

 They are clearly distinct and I hasten to correct the grave error. 



Enallagma geminata n. sp. — Length of abdomen, (^ 20 mm., 9 19 mm.; 

 hind wing % 15 mm., $ 15 mm. ( 'J, ) Head: labrum and brows blue, 

 clypeus and vertex black, post-ocular spots cuneiform, not connected, 

 blue ; prothorax black edged with blue, scarcely bilobed. Thorax black 

 above with a blue stripe each side (this is someti.mes divided as in N. 

 posita) ; sides blue with a black line on the suture. Wings hyaline, pter- 

 ostigma black ; legs black and pale, tarsi black. Abdomen brassy black, 

 blue as follows : i, an apical ring and a lateral spot connected with it ; 2, a 

 basal ring interrupted dorsally, this ring is sometimes very wide and the 

 interruption also, there is a lateral stripe connected with the ring ; 3-6, 

 basal interrupted rings ; 8-9, wholly, abdomen beneath pale blue with 

 brown shades apically ; the abdominal appendages are black, agreeing very 

 closely in form with those of divagans ; they are relatively stouter, and 

 from above the outline is more oblong ; there is a sharp tooth on the 

 lower edge of the inner face, the upcurved apex of the lower branch 

 (referring to the type exsulans) is a little stouter and more obtuse than 

 in divagans, while the upper one is a little less promment ; the inferior 

 appendages are little longer than the superior with the acute apex curved 

 upward and inwards. 



? . — V^ery similar to the male. The blue of the front of the head of the 

 male is pale blue or brownish ; the post-ocular spots and humeral stripes 

 a little paler ; the abdomen is black above, the sides pale blue, sternal 

 membrane black ; there is an apical ring on i ; 3-7 have a basal pale blue 

 ring with a wide interruption dorsally ; on 8 there is a large blue spot on 

 either side, these are separated dorsally by a black line of varying width ; 

 the appendages are black, the valves pale or faded brown. 



* "Journal of the Entomological Society of New Vork," vol. iii, p. 48. 



+ "Journal of the Cincinnati Society of Natural History," January, 1895, page 205. 



