1895. 



PROCEEDINGS OF THE NATIONAL MUSEUM. 135 



edged with black, and traversed by a median black stripe. Labium: 

 Mentum and inner margin of lobes black, remainder of lobes yellowish. 

 Vertex and occiput black. Eear of eyes luteous, with two black spots. 



Anterior and middle lobes of prothorax black, their anterior margins 

 yellowish. Posterior lobe obscure yellowish, barely notched in the 

 middle of the hind margin. 



Thorax yellowish brown, with black stripes as follows: A broad 

 median dorsal reaching- theantealar sinuses, an antehumeral not reach- 

 ing the sinus; a broader humeral; an oblique lateral, in which the spi- 

 racle lies, and which is closely connected with a similar parallel stripe 

 in front of itself; a stripe on the second lateral suture, and an incom- 

 plete oblique stripe behind the suture; these stripes are more or less 

 confluent below; the median dorsal and antehumeral are connected 

 inferiorly by a transverse anterior mesothoracic stripe. Latero-ventral 

 metathoracic carina black. Interalar pieces mostly yellowish. Pectus 

 obscure luteous. 



Feet black, coxaj marked with luteous, first femora luteous inferiorly. 

 Hind tibia^, with 7 outer, 10-11 inner spines. 



Abdomen shaped as in 0. hrachiale, Beauvois; black, marked with yel- 

 lowish or reddish brown, as follows: 1 with a small dorsal and a small 

 lateral spot; 2 with a larger dorsal and two 

 lateral spots; 3 with two pairs of dorsal spots, 

 one pair smaller and in front of the middle trans- 

 verse (supplementary) carina, the other larger 

 and behind the carina, and a lateral spot; 4-0 

 with a dorsal spot on each side of longitudinal Fie. 12 



carina, near the middle of the segments; on 5 orthetrum wrighth, Male. 

 and G each spot is almost divided longitudinally s,de v,ew of genuai.a of se<„nj ai.. 

 into two; 3-8 with a ventral spot on each side. 



Superior api)endages yellowish, not as long as the last two segments; 

 of the shape described for 0. truncatum; inferior denticles very small. 

 Inferior appendage yellowish, similar to that of 0. trunvatnm. 



Genitalia of 2 rather prominent, black. Anterior lamina longer than 

 any other piece, its apex rounded, barely notched ; viewed from the side 

 it is quite slender. Ilamule with apex bifid, branches approximately 

 of equal length when viewed laterally; internal (anterior) branch slen- 

 der,, with a very acute apex directed outward; external branch much 

 broader, somewhat lamellar, apex broad, truncate, angles rounded. 

 Genital lobe rather broad, rounded, projecting equally with the inter- 

 nal hamular branch. 



Wings hyaline, oidy the faintest tinge of j^ellow at extreme base of 

 posteriors. Pterostigma dark brown. Membranule cinereous, slightly 

 whitish at base. Reticulation black. Front wings with 12-13 ante- 

 cubitals, postcubitals, one hypertrigonal ; discoidal triangle of two 

 cells; internal triangle ot three cells; three rows of iiosttriangular 

 cells; one median cross A'ein. Hind wings with 10 antecubitals, 10-11 

 postcubitals, no hypertrigonals, one median cross vein (2 in left wing), 



