522 ON DBAQONFLIES FEOM SOMALl-tiAIffi. [Apr. 21 , 



point or very short stalk ; triangle traversed, 3 rows of post-trian- 

 gular cells increasing ; 3 cells in the subtriangular space ; one 

 cross-nervure in the lower basal cell ; no supratriangular nerviiles. 

 Hind wings with the base of the triangle on a level with the areulus ; 

 pterostignia yellow, between thick black nervures. 



This species much resembles 0. aendescens, Fabr., and, 0. subfas- 

 ciolatum, Brauer; but the almost unstalked sectors of the areulus on 

 the fore wings remove it from any of the allied species. It is, how- 

 ever, an Ort?ietrum in its essential characters, and, except in this one 

 particular, exhibits no resemblance to Leptetrum. It is curious 

 that of the three new species in the present small collection, none 

 seem to agree exactly with the described genera ; and as I am 

 unwilling to establish new genera on single specimens, I place them 

 provisionally in Ortlietrinn, to which they seem perhaps most 

 nearly allied. 



4. Oethetbum phillipsi, sp. n. 



Long. Corp. 35 milHra. ; exp. al. 51 millim. ; long. pter. 2-2-3 

 milUm. 



Male. Head greenish, the frontal tubercle darker, and the adja- 

 cent parts of the upper orbits, as well as the occipital triangle, 

 black ; occiput black above, yellow beneath. Thorax and abdomen 

 wholly pulverulent blue, the sutures and carinas lined «'ith black, 

 and the front of the niesothorax with incomplete black shoulder- 

 stripes. Abdomen rather slender, moderately inflated at the base. 

 Legs black ; the front legs yellowish on the outside, the others with 

 the cox£e and a stripe on the femora yellowish. Lower anal ap- 

 pendage fully -I as long as the upper ones. Wings narrower than 

 in the last species, clear hyaline, the base stained with yellow, 

 especially on the hind wings; membranule white, not bordered 

 with blackish below. Neuration and pterostigma coloured as in 

 the last species ; nodal sector and space between the nodal and 

 subnodal sectors similar. Fore wings with 11 antenodal cross- 

 nervures, the last continuous, and 8 postnodals, the first two at 

 least not continuous ; sectors of the areulus distinctly stalked ; 

 triangle traversed, 3 rows of post-triangular cells increasing ; 

 3 cells in the subtriangular space ; one supratriangular nervule. 

 Hind wings with the base of the triangle distinctly wdthin the level 

 of the areulus. 



An unusually slender species, much resembling the last super- 

 ficially, but very distinct. 



Dobar, Goolis Mountains, Feb. 4, 1895. 



5. Ortheteitm lOBTi, sp. n. 



Long. Corp. 32 millim. ; exp. al. 55 millim. ; long. pter. 4 milHm. 



Female. Head greenish yellow, the mouth and lower parts darker. 

 Thorax greenish yellow, with a yellowish-white stripe on each 

 shoulder, bordered below by a darker greenish-brown space than 

 the rest of the coloration. Abdomen moderately short and 

 broad, tawny, with a black central carina commencing on the 



