Acanthagrion apicale Selys, 1876

Figures 25-29 (larva)

Material. 3♂ 1♀ (reared, with exuviae), Base Camp.

Larva. Occipital lobes bulging, but not angled, beset with spines; occipital border deeply excavated. Labium (Fig. 25) reaching to beyond first pair of coxae. Antennae seven-jointed (Fig. 26), Hind border of pronotum with lateral angles pro· duced, but not pointed. Wing sheaths reaching to base of segment 5 (Fig. 27). Tibiae and tarsi with scattered soft hairs. Adomen dark with a pale longitudinal dorsomedian line; posterior angles of segments 4-8 strongly marked off and beset with spinules; ovipositor slightly surpassing end of segment 10, valves beset with about four larges spines and a few very smaIl ones, in a single row (Fig. 28). Lateral and central caudal gills of same length, sharply pointed (Fig. 29).

Measurements. Total length (excl. gills) 10.5; caudal gills 7.0; hind femur 2.5.

Remarks. The larva of A. apicale comes closest to that of A. luteum Racenis described by Geijskes (1941) sub " A. ascendens Calvert ", but specimens were not compared directly. The larva was found in a small stagnant pool in close vicinity of a sandy creek, in the forest. The pool was filled with leaf litter, had a sandy ground and clear wa· ler.. A larva of Fylgia amazonica lychnitina De. Marmels was found in the same pool (see below).