154 [J«iy. 



are widely separated at their origin, and in the genitalia of the second segment there 

 is a pencil of stiff hairs on either side of the anterior lobe, as described by Hagen 

 (Revue Odon., p. 289) in ampullacea, Schnd. (a synonym of Sahina). But in the 

 African examples to which Selys (Ann. Soc. Ent. Belg., xxxi, p. 22) gave the varietal 

 name of " afrlcana," the sectors under consideration arise practically from the same 

 point, and there is no pencil of hairs on the genitalia of the second segment, thus 

 proving that the two forms are not only distinct as species, but will probably 

 eventually be placed in different genera. 



Ortheteum chrtsostigma, Burm. (harhara, Selys). — Biskra, 

 May 20th, 1894 ; Aiu Kriar, June 20th, 1S96 ; Lac des Oiseaux, June 

 25th, 1896; La Calle, July 15th, 1896; five examples in all, varying 

 in size. 



Orthetrum Eamburii, Selys. — Nearly twenty-five examples, 

 varying very much, from Biskra, various dates in May, 1894, and Ain 

 Kriar, June 20th, 1896. These are a puzzling lot, but I think I have 

 correctly identified the greater part of the males by the genitalia of 

 the second segment ; one or two proved uncertain (owing perhaps to 

 individual conditions at the time they were captured). One very im- 

 mature female, presumably belonging here, has the costal portion of 

 the wings strongly tinged with yellow (it may be ccerulescens, F.). O. 

 Hamhurii is the nearest ally of 0. coerulescens ; the latter is reported 

 from Algei'ia, but I have seen no specimens from that quarter that I 

 can refer to it with certainty. 



Orthetrum cancellatum, L. — La Calle, June 16th, 1896 ; Lac 

 Houbeira, first half of July, seven examples. 



Orthetrum kitidinerve, Selys. — Biskra, May 18th, 1894 ; Con- 

 stantine, first half of June, 1894 ; Ain Kriar, second half of June, 

 1896 ; seven examples. In immature females the body is ochreous 

 and almost entirely without mai'kings. 



Sub-fam. GOMPHIN^. 



ONTCHoaoMPHUS FORCiPATUs, L. — Two ^ from Constantine, June 

 ]2th, 1894, and June 6th, 1895. These may be regarded as of the 

 " race meridionale," but the amount of dark coloration on the abdo- 

 men, &c., is greater than in most examples from the south of Europe. 



Ontchogomphus Cost,!:, Selys {Genei ^ , Selys, olim). — I have 

 before me six ^ and two ? from Biskra in May and June, and Con- 

 stantine in June. The general ground colour is pale ochreous, and 

 the brown markings on the thorax are sometimes scarcely visible ; in 

 very adult individuals the thorax becomes whitish pulverulent. The 

 legs remain wholly pale, excepting a short brownish or blackish line 

 on the femora externally near the apex. 



