ODONATA OF BAJA CALIFORNIA. 527 



superior pleural margin black as far forwards as the hind 

 end of the antealar sinus, the bands just described attain- 

 ing this black by narrow upward prolongations. 



Abdomen above red or reddish -brown, dorsum of i, 

 intersegmental articulations and some markings on either 

 side of base and apex of 3-9 or 10 (those at base and 

 apex of 8 and 9 connected in some S S ) — black, as well 

 as the ventral surface. 



Superior appendages black, as long as 9+ 10; viewed 

 from above convergent from base to apex, slightly thick- 

 ened in the apical two-thirds, thence tapering to the acute 

 apex; viewed from the side, curved so as to be convex 

 above for the first three -fourths of their length, straight 

 in the apical fourth, of nearly uniform thickness as far 

 as three-fourths of their length, where they are somewhat 

 thickened and the inferior margin bears a row of 4-6 

 closely approximated denticles, extreme apex acute and 

 slightly upturned. Inferior appendage about one -sixth 

 shorter, brown, except along the edges and the apex 

 which are black; viewed from the side, curved so as to 

 be somew^hat concave above; viewed from below, subtri- 

 angular, notched at the apex to form two denticles which 

 are upturned. 



Anterior lamina projecting as much as does the genital 

 lobe, margin entire and when viewed from below strongly 

 curved so as to be convex anteriorly. Hamule simple, 

 not bifid, projecting twice as far as the lamina, apical 

 half curved backwards and slightly outwards, tapering to 

 the apex, which is acute but rounded at the extreme tip. 

 Genital lobe but very slightly widened before the apex, 

 which bears a rather dense tuft of short hairs. 



Legs superiorly brownish or yellowish, inferiorly black- 

 ish ; hind tibiae with 10-12 spines on the anterior (outer) 

 row, 13-15 on the posterior (inner) row^ 



2d Ser.. Vol. IV. ( 35 ) February 19. 1895, 



