1899.] XATURAL SCIENCES OF PHILADELPHIA. 231 



Au ajipareutly teneral female from Sheikh Huseiu, October 16, 

 1894, is probably of the same species as the above-described male; 

 the last four and a half segments are wanting, and the specimen is 

 ■otherwise in poor condition. The pale green of the male is replaced 

 by pale luteous throughout. The black on the prothorax is but 

 faintly indicated. The black humeral stripe is but a line, the 

 middorsal stripe is narrower, so that it is hardly wider than the 

 pale antehumeral, and it is bisected lengthwise by the middorsal 

 carina being luteous. The two legs which remain (a first and a 

 second) are pale yellowish. The left front wing has twelve post- 

 nodals, the ultranodal sector rises at the ninth postnodal on all Avings 

 except the left hind. The pterostigma is very pale luteous on all 

 wings, slightly smaller on the hind than on the front. 



Length of head, thorax and first five abdominal segments 23 

 mm , hind wing 19 mm. 



2. Onychogomphus sp. 



One female, Berbera, July 5, 1894. 



The females, at least of such East African species of Onycho- 

 gompJnis as Genei, Harjeni, pumilio, Costce, obliferatus and lacudris, 

 are difficult to identify from the descriptions in the absence of any 

 specimens of this group. It seems possible that some of the differ- 

 •ences indicated as specific may be due to age and to imperfect 

 knowledge owing to the relatively few individuals examined. 

 This being the case, I think it likely that this female from Berbera 

 may be one of the species already described, in spite of the fact 

 that it differs more or less from the descriptions. I prefer, there- 

 fore, not to give it any specific name, but to add notes Avhich may 

 facilitate its future identification. 



Face and lips very pale yellowish, perhaps somewhat greenish in 

 life, unmarked with black. Upper surface of frons pale yellow 

 with a narrow basal brown line at the base of the vertex, and a 

 group of 10-12 black denticles on either side at its front margin. 

 Vertex yellowish, ocelli and the area between them and the antennse 

 (except the first joint) blackish. Occiput luteous, its hiud margin 

 armed with 16 black denticles. 



Prothorax luteous. Thorax pale greenish -yellow, dorsum almost 

 immaculate except for the trace of a pale brown antehumeral 

 stripe ; the humeral and the second lateral suture each with a 



