Zoou— Vol. I.] CALVERT— ODONATA. 377 



basal tooth but not as far as the denticulated dilatation; yellowish or luteous, 

 darker at the tip; much narrower in the apical half (in that midway on the 

 inner side there is a distinct "shoulder" where the narrowing begins) and 

 curved somewhat inwards, apex blunt and rounded. 



Femora with two blackish stripes, one anterior, the other inferior; tibiae 

 with a single inferior blackish stripe. 



Wings clear, pterostigma fusco-luteous, surmounting two cells; front wings 

 with ten to thirteen postnodals, nodal sector arising usually between the third 

 and fourth (between fourth and fifth in one wing of one male); hind wings 

 with ten to eleven postnodals, nodal sector arising usually, but not always, 

 close to the third. 



Female (young). Like the male in coloring. Abdominal segment 10 not 

 metallic green but pale yellowish in most individuals, its hind margin with a 

 median excision whose depth is one-fifth of the length of the segment, 

 appendages as long as 10. Margins of the genital valves denticulated, their 

 slender processes extending backwards as far as do the appendages of the 

 10th segment. 



Dimensions: Total length, S 46 mm., ? 42-44 mm.; abdomen, <$ 38 mm., 

 2 33-5-35 mm-; hind wing, <5 23.5 mm., $ 23.5-25 mm. 



5 £ 14 ? Tepic, Oct., 1894, Eisen and Vaslit. 

 1 £ " Nov., 1894, " " " 



6£ 14? 



Tenacities has hitherto been recorded only from the islands 

 of Cuba and Martinique. Some years ago I identified a 

 female from Bath, Jamaica, by Mrs. Swainson, sent me by 

 Mr. T. D. A. Cockerell. 



4. Mecistogaster ornatus Rambur. 



Mecistogaster ornatus Ramb., Ins. Nevr., 1842, p. 288; Kirby, Cat. Odon. 

 1890, p. 120. 



The opaque yellow spot at the tip of the wings stops infe- 

 riorly at the ultranodal sector, the pale yellow "milky" spot 

 below extends to the nodal sector. Abdomen 88-93 mm -> 

 hind wing 57.5-60 mm. De Selys' statement for the genus 

 Mecistogaster, "quadrilatere a cote superieur un quart on 

 un tiers plus court que l'inferieur" ' holds for only the hind 

 wings of these two males; on the front wings the upper 



' Mem. Courou., Acad. Belg., Vol. XXXVIII, 1886, p. 15. 



