1895. 



PROCEEDINGS OF THE NATIONAL MUSEUM. 139 



rupted anteriorly, so that the inclosed round spot becomes confluent 

 with the brown of the frons at this point. Vertex dark brown, with a 

 crescentlike yellow tip; concave anteriorly. Occiput triangular, yel- 

 low above and behind, its lateral angles and the rear of the head black. 



Thorax brown, dorsum with a short aiitehnmeral yellow line from 

 the anterior mesothoracic border halfway up to the antealar sinus; a 

 very narrow yellow humeral line, slightly wider at the sinus. Sides 

 with two broad oblique yellow bands, margined with shining black, 

 one beginning under each pair of wings, but not attaining tlie bases of 

 the feet. Antealar sinuses and some spots on interalar space yellow. 



Feet: Bases and femora reddish brown, apices of femora, tibiae, and 

 tarsi black. Spines of the hind tibi.ne on the inner and outer sides 

 equal in number and length. 



Abdomen distorted in this specimen, but apparently inflated at the 

 base, thence gradually tapering to the apex; brown in the dried con- 

 dition and marked with yellow as follows: A trans- 

 verse stripe margined with black on each side, near the 

 middle of the dorsum of 2, but not meeting on the me- 

 dian carina; 3-7 with a median dorsal triangular spot 

 a little in front of the middle of the segment; 2 and 3 

 at base and 6-9 with a lateral spot; no supplementary ^schna rileyi. 

 lateral carinas; 10 denticulated ventrally. frons and vertex, v,e»ed 



Appendages brown, leaf-like, a little longer than the 

 last two segments; rather narrow, with a slight dorsal longitudinal 

 carina; apices rounded. 



Wings hyaline, reticulation dark brown, costa yellowish anteriorly 

 to some distance beyond the nodus. Pterostigma yellow-brown, sur- 

 mounting 3-3i cells; internal vein prolonged to principal sector. Mem- 

 branule white, apical third grayish. Subnodal sector with three infe- 

 rior branchlets (including the terminal one). Upper sector of the 

 arculus arising perceptibly above the middle of the arculus, which 

 latter meets the median vein at the level of the third costal antecubi- 

 tal on the front wings. Two hypertrigonals (three on left hind wing). 

 Triangle of four cells, two on the inner side. Internal triangle pres- 

 ent, with one cross vein; four other median cross veins on the front 

 wings, three other on the hind wings, all nearer the base than the 

 ar(;ulus. Front wings with 17 R 10 L antecubitals, flrst and seventh 

 thicker; 12 II 11 L postcubitals, five posttriangular cells, then two rows 

 increasing. Hind wings with 10 antecubitals, first and sixth thicker; 

 13 R 12 L postcubitals; four posttriangular cells, then three rows 

 increasing. 



Locality. — One female in the National Museum collection, from Kili- 

 manjaro. The male is unknown to me. 



The coloration of the superior surface of the frons (Fig. 13) is char- 

 acteristic of this species. 1 have named it after the late Dr. C. V. Riley, 

 United States Entomologist, to whom I am indebted for the opportunity 

 of studying several collections of Odouata. 



