72 BURM poster's o don at a. 



that its sex as given, although probable, is not certain. Hagen says 

 (Proc. Bost. Soc. Nat. Hist, xv, p. 375, 1873) "Having before me 

 the type of D. ochracea Burni.," etc. A description of these two 

 types follows: 



% types. Yellow passing: into olive on the frons and labrum, into brown on 

 vertex, occiput, thoracic dorsum, and on either side of the apices of abdominal 

 segments 2-10 as a (usually triangular) spot. 



Legs luteous, somewhat darker on the anterior surfaces. 



Eyes in contact for only about i mm., or about one-third the length of the 

 occiput. 



Hind lobe of the prothorax smaller than the other lobes, rectangular, with the 

 angles rounded olf, its transverse dimension greater than its antero-posterior, 

 hind margin entire. 



Superior abdominal appendages as long as 9. luteous, slender and suhcyliudrical 

 when viewed from above; viewed in profile, arched in their basal half, apical 

 half nearly straight; inferior margin of the third fourth of the appendage with 

 a row of live denticles ending abruptly distally, whence the apex tapers to an 

 acute point. Inferior appendage not more than one-tenth shorter, extending 

 considerably beyond the denticles of the superiors, triangular, rather slender, 

 about one-and-a-half times as long as its greatest width (at the base). 



Genitalia of abdominal segment 2 inconspicuous, genital lobe most prominent, 

 hamule bifid at tip, inner branch slender, forming a round hook with a black tip, 

 outer branch longer, three times wider, obliquely truncated with angles rounded 

 ofF. Genital lobe trapezoidal, its tip truncated so that its anterior margin is about 

 one-and-a-half times as long as its posterior margin. 



Wings clear, reticulation reddish at base, elsewhere blackish. Pterostigma 

 ochreous, surmounting one cell and parts of two others. Membranule blackish- 

 Upper end of arculus between Srst and second antenodals (or at the second, hind- 

 wing of one % ). its sectors distinctly stalked, separated throughout by one row 

 of cells only (or 2 cells at margin of bind wing 1 '^ ). supplementary sector next 

 below the suhnodal sector separated from it by one row of cells; one submedian 

 cross-vein, nearer the base than is the level of the first antenodal : nodal sector 

 not waved, separated from the subnodal by one row of cells except at the margin 

 of the wing, no hypertrigonals. 



Front wings with 9-10 antenodals. the last not continuous, 7-8 postuodals 

 triangle with one cross-vein, internal triangle of three cells; three posttriangular 

 cells, then two rows to beyond the level of the origin of the subnodal sector (or 

 two rows from the triangle outwards — 1 % ) then three rows almost to the wing 

 margin, with four marginal cells. Yellow at base for the entire width of the 

 wing out to the level of the arculus. 



Hind wings with 7-8 antenodals, 8-9 postnodals, triangle free, its proximal 

 side in prolongation of the arculus, no internal triangle; posttriangular cells 2, 

 1, 2, 2, 3 -f- . . . . 8-9 marginal cells, sectors of triangle united at origin. Yellow 

 at the base for the entire width of the wing to the third antenodal and to the 

 level thereof on front and hind margins respectively, and filling the greater part 

 of the triangle and adjoining cells. 



Total length 27, abdomen 17.5, front wing 23-24, hind wing 21.5-23. pteros- 

 tigma 3. 



