1899,] NATURAL SCIENCES OF PHILADELPHIA. 239 



Mr. McLaclilau draws the conclusion (I. c. ), "the two forms 

 are not only distinct as species, but will probably eventually be 

 placed in two different genera. ' ' 



It is consequently of interest to note that the present male from 

 Berbera agrees with Sabiiia in characters Nos. 1 and 2, with 

 africana in No. 3. The distance between the origins of the two 

 sectors of the triangle is about .5 mm., therefore the same as in 

 Sahina ; no trace of the hairs exists on the anterior lamina, whose 

 anterior surface, moreover, is yellow instead of blackish as in the 

 Asiatic males of Sahina which I have examined. 



The female from Berbera has the labrum pale yellowish, the 

 sectors of the triangle separated at their origin by a distance of 

 .2-. 3 mm., therefore less than in Sahina, the black line on the 

 frons bordering the vertex and eyes is narrower than in Sahina, 

 and the seventh abdominal segment has a large yellow spot on 

 either side, at its middle, similar to the pair on 6. 

 12. Sympetrum Fonscolombii Selys. 



One male. Sheikh Husein, September 29, 1894. 



HEMISTIGMOIDES new genus. 



(1) Vertex truncated at tip. (2) Frons with its upper surface 

 sloping downward and forward from the vertex meeting its anterior 

 surface at an angle of about 115°, the line of junction of these 

 two surfaces being marked by a well-defined carina, (5) no lateral 

 or other carinse. (4-) Eyes in contact for a distance nearly equal 

 to the middorsal length of the occiput. 



(5) Hind lobe of the prothorax of equal width with the middle 

 lobe, (6) its hind margin Avith a shallow median concavity and 

 thus being slightly bilobed. 



(7) Abdomen shorter than the hind wing, thickest at the third 

 segment, thence tapering gradually to the tip, triangular in cross- 

 section; (6") segments 2, 3 and 4- each with a distinct, supplement- 

 ary, transverse carina. 



(9) Femora armed with very short (except the last one to three) 

 spines directed toward the knees; (10) tibiie with longer spines, 

 those of the anterior row (thirteen) on the first tibia, of the poste- 

 rior row on the second (twenty) and third (eighteen) tibia3 being 

 more numerous than those of the posterior (eleven) and anterior 

 (ii, 9-11, iii, 13) rows respectively; this arrangement of the tibial 



