230 PROCEEDINGS OF THE ACADEMY OF [1899. 



ODONATA. 



1. Enallagma'? sp. 



One male from Sheikh Huseiu, September 29, 1894, has lost 

 the last seven abdominal segments, so that a positive identification 

 is at present impossible, but the remaining parts seem to indicate a 

 relationship to such species as glaucum Burm. (gaboneiixe Selys). 

 The following descriptive notes are added to permit of future 

 identification. 



Frous, genie, nasus, lips and rear of head pale green; rhinarium 

 pale brown, vertex black from eye to eye, the site of the usual 

 postocular spots is green confluent with the same color of the rear 

 of the head. 



Prothorax green on either side, and a middorsal black baud half 

 as wide as the protljorax itself. 



Thorax j^ale green, a middorsal and a humeral stripe black, the 

 latter half as wide as the pale antehumeral stripe, the former twice 

 as wide as the j)ale antehumeral stripe; a short, narrow, black stripe 

 at the upper end of the second lateral suture. 



Femora pale green with an external (superior) black stripe. 

 Tibia} and tarsi yellowish, the former with an external (anterior) 

 lilack line in their proximal halves. 



Abdomen pale bluish-green, an uninterrupted middorsal black 

 stripe on 1-3, widened and then suddenly narrowed before the apex 

 of 2, narrowed at the base of 3. 



Wings with the inferior sector of the triangle arising at least as 

 far in front of the submedian cross-vein as the latter is long, 

 quadrilateral with its uf>per side one- third as long as the lower side 

 on the front wings, one-half on the hind wings, three antenodal 

 cells, eleven postnodals on the front wings, ten on the hind wings, 

 nodal sector arising near the fifth postnodal, ultranodal sector at 

 the eighth. Pterostigma surmounting less than one cell ; on the 

 front wings black, with the lower and outer sides nearly equal; 

 on the hind wings smaller, ochre, with the outer side distinctly 

 longer than the lower. 



Length of head, thorax and first three abdominal segments 12.5 

 mm., hind wing 19 mm. 



The difterence in the pterostigmata of the front and hind wings 

 suggests Isehnura, but I notice something similar, although less 

 marked, in a male of glaucum Burm. {gahonense Selys). 



