PHILIP P. CALVERT. 



59 



Burm. * Bahia", and the printed pin-label "Wintheni". A de- 

 scription follows : 



9 type. Face and lips luteous, frons and vertex darker and with a slight 

 metallic-blue reflection. Vertex low, its upper margin, viewed from in front, 

 equally 3-sided. Eyes in contact for a distance equal to the length of the dark 

 brown occiput. Eear of head dark brown with some paler spots. Prothorax 

 dark brown, front lobe with a yellow spot on the middle of its anterior margin, 

 hind lobe narrower than the other lobes, nearly semicircular in shape, its hind 

 margin entire. Thorax and abdomen blackish, pruinose. some yellowish spots at 

 the bases of the legs. Legs blackish (third pair missing), femora inferiorly lute- 

 ous. Tenth abdominal segment produced backward ventrally so as to be three 

 times as long as doi-sally, and thus underlying the "anal tubercle." Sternum of 

 9 also produced backward, underlying 10 in part and terminating in a rounded 

 free margin bearing a transverse row of long bristles (PI. I, fig. 7). Abdominal 

 appendages one-half as long as 9, two and a half times as long as dorsal surface 

 of 10, straight, simple, black. Vulvar lamina produced slightly beyond 8, its 

 apex bilobed, lobes short, separated by an interval greater than the width of one 

 of them, tips rounded. Ventral surface of 9 with two slender appendages. 



Wings with most of the veins (which are themselves blackish) bordered on 

 either side with yellowish brown, more especially at the apices and near the costal 

 margins. Pterostigma dark reddish brown surmounting 2 -| — 3+ cells. Mem- 

 branule absent on the front wings, extremely small, grey, on the hind wings. 

 Arcnlus slightly beyond the second antenodal, its sectors stalked, nodal sectoi- 

 not waved, supplementary sector next below the subnodal separated from it by 

 but one row of cells, no hypertrigonals, all discoidal triangles fi'ee, one submedian 

 cross- vein. 



Front wings: 10 antenodals, the last one continuous, 9 postnodals, submedian 

 cross-vein slightly farther than is the level of the first antenodal. internal tri- 

 angle free, anterior side of discoidal triangle slightly broken so that the outer 

 limb is one-fourth as long as the inner (proximal) ; one row of posttriangular 

 cells to the level of the origin of the subnodal sector, then two i-ows nearly to 

 the wing-margin, increasing to 3 marginal cells; superior sector of the triangle 

 arising on the outer side thereof a little farther forward than its posterior angle. 



Hind wings: 8 (left) 9 (right) antenodals, 9 (right) 8 (left) postnodals, sub- 

 median cross-vein nearer the base than is the first antenodal, discoidal triangle 

 unbroken, sectors of triangle widely separated at their origins, two (right) or 

 one (left) posttriangular cells between short sector and first sector of the triangle, 

 increasing to 9 marginal cells. 



Total length 33 ram., abdomen 23, front wing 27, hind wing 26. i)terostigma 3. 



Venosa is to be referred to the genus Dasythemis Karsch, from 

 the generic description of which (Ent. Nach. xv, pp. 249, 251, 

 1889) it differs .slightly as follows: The outer limb (iiusserer Schen- 

 kel) of the broken anterior side of the triangle of the front w'ings 

 is apparently relatively shorter as compared with the inner limb, 

 the posttriangular cells (Diskoidalfelde) are regular, the triangle 

 of the hind wings is normal, three-sided, instead of "(lurch Ab- 

 stumpfung des iiussern AVinkels ebenfalls vierseitig", the hind lobe 



TRANS. AM. ENT. SOC. XXV. AUGUST. 1898. 



