Mr. W . l'\ Kiiby on Odonala from Sierra Leone. 7') 



Wings liyaliiie, with black iic'rvuie.s ; ])tei-ostigina rather 

 long and hrond, bhu-kish, rather pah-r in the niidiUe ami 

 towards its h)wer edge. Menibranule of liind wings whiti.sh 

 in tiic middle and bordcied with brown : adjacent part of 

 wing slightly stained with yellow in the reddest males; 

 otherwise this is wholly wanting. Anal appendages yellowish 

 or reddish. 



Described i'roni sixteen specimens (seven males and nine 

 females) collected by Dr. Strachan at Lagos. Only one of 

 the males has the abdomen red and the pale abdominal 

 markings obliterated, but the markings of the thorax are of 

 the usual pale yellowish colour seen in the other specimens. 



]\lr. Austen collected two males at Sierra Leone on Aug. 24 

 and 8ept. 4 ; in both of these the abdomen is red, but in one 

 the pale abdominal sjjots are indistinctly visible. In both 

 the spots on the thorax are dull red, whicli is not the case in 

 any of Dr. Stiachan's specimens. There is also an unusually 

 well-marked female, with only one cross-nervure in the 

 triangles of the fore wings, from Abyssinia, which appears to 

 belong to the present species. 



Among otiier interesting species obtained by Dr. Strachan 

 at Lagos is a male belonging to the genus l)icraiioj>i/(j(i^ 

 Karsch, which is allied to the East-African D. mundaluj 

 Karsch. I believe that Dr. Karsch is correct in referring my 

 ^thrivianta rezia from Madagascar to Dicranopyga, although 

 the triangle of the fore wings is traversed by a triangle on 

 the right side in the unique type. Dr. Strachan also obtained 

 a single damaged Sjiccimen of a new species of Nympheutria, 

 Karsch, which 1 defer describing for the present. 



Orthetrum chrysostigma. 



LibeUula chrysustiyvut, Jiurm. Ilandb. Ent. ii. p. 857. n. 58 (1839). 

 Libdlula barbnra, De Selys, Lucas, Expl. Alg. iii. p. 117, pi. 1 [W< ■> 



■Ja,b(l6W). ° ' 



Orthetrum chrysostigma et barbarum, Kirb. Cat. Xeiir. Udou. p. .3(> 



nu. 3, 4 (Ittik);. 



45 sj)ecimcns, August and September (1899). 



The most adult specimens are pulverulent blue in both 

 sexes, and the least mature are of a light red ; but there is no 

 median thoracic band, as in O. Julia, and the cross-nervures 

 in the lower costal space are nearly always yellow, instead of 

 black like those in the upper space. 



Orthetrum Julia, sp. n. (PI. II. tier. 3.) 



Long. corp. 39-4;» millim.; exp. al. GO-74 millim. ; long, 

 pter. 3-4 millim. 



