ODONATA OF BAJA CALIFORNIA. 549 



slightly constricted after the base, thence gradually dilating, 

 especially on the inner side, to two-thirds their length, 

 thence tapering to the acute apex. Viewed from the side, 

 each appendage is curved downwards in its basal half, 

 thence upwards in its apical half: it gradually increases in 

 thickness from the base and forms a well-marked tooth 

 on its lower surface at not quite half its length ; from the 

 tooth it gradually tapers to the acute apex; on the lower 

 surface between the base and the tooth are eight to 

 twelve denticles. 



Inferior appendage half as long, luteous; viewed from 

 below, broad, apex more than half as wide as the append- 

 age is long and deeply concave from side to side, the two 

 lateral apices so formed are upcurved, unguiculate, reach- 

 ing distinctly beyond the tooth of the superiors. 



Genitaha of 2 moderately prominent. Anterior lamina 

 not quite as prominent as the hamule, thickened at each 

 side, apex broad, concave from side to side. Hamule 

 simple, lamellate, narrowed in its apical fourth to form 

 the acute, somewhat unguiculate apex, which is directed 

 outwards and backwards. Genital lobe as prominent as 

 the hamule, broader before the apex than at the base. 



Wings hyaline, slightly smoky, reticulation brown, costa 

 partly yellow. Pterostigma luteous, narrow, about one- 

 fourth as wide as long. Membranule cinereous. A very 

 small ferrugineous tinge at the base of the front wings. 

 Hind wings with a ferrugineous basal spot extending out- 

 wards nearly to the median cross-vein, and from the sub- 

 median nearly to the hind margin. Sectors of the arcu- 

 lus barely stalked, or not stalked, at their origin in the 

 front wings, stalk somewhat longer in the hind wings. 

 No hypertrigonals (present in the front wings of i S ). 

 One median cross-vein, placed nearer the base than the 

 first antecubital. Nodal sector hardly waved. Front 



