348 
Psyche 
[June 
species, and since Rubrica is a somewhat unusual genus with respect 
to adult structure and behavior, it seems worth presenting a descrip- 
tion of larval characters. Our description is based on 15 full-grown 
larvae from Colombia and Argentina. We noted no variation worthy 
of note and no differences between larvae from the two widely sep- 
arate areas. 
Length 30 mm ; maximum width 8 mm. Body robust, more tapered 
anteriorly than posteriorly; terminal segment blunt, supra- anal lobe 
surpassing subanal; pleural lobes well developed; middle body seg- 
ments weakly divided into two annulets dorsally; each segment except 
last two with a transverse ventral swelling (Fig. 7). Spiracular atria 
about .20 mm in diameter except second pair only .16 mm in diame- 
ter; external opening of atrium small, about .08 mm in diameter 
(second pair .07 mm), peritreme very narrow; walls of atrium lined 
with many rings of minute spinules; opening into subatrium large, 
armed with a strong circlet of spines (Fig. 8). Integument smooth, 
visibly setose only under high power; each segment dorsally with a 
few minute setae, longest measuring only .06 mm; parts of venter 
with sparse, weak spinules. 
Head 1.9 mm wide, height (exclusive of labrum) 1.9 mm (Fig. 4). 
Parietal bands absent; antennal orbits very small, only .10 mm in 
diameter, papillae short, about .04 mm long, only slightly longer 
than basal width (Fig. 5). Front deeply impressed just mesad of 
each antennal orbit. Head with scattered minute punctures, some of 
them giving rise to minute setae, especially on clypeus. Labrum 
.70 mm wide, emarginate medially, disc with more than 40 rather 
strong setae as well as a number of non-setigerous punctures, apical 
margin strongly bristly, paralleled by a row of about 40 barrel- 
shaped sensilla.; epipharynx strongly spinulose, but with a bare cen- 
tral band which bears six sensory pores on each side of the: midline, 
also with several additional pores above the central band (Fig. 9). 
Mandibles .95 mm long, .5 mm wide at the base, tridentate and 
with a weak fourth tooth between the apical two; sides with several 
minute setae. Hypopharynx and mesal margins of maxillae densely 
spinulose; maxillae with several lateral setae; maxillary palpi and 
galeae subequal in length, the latter more slender, somewhat horn- 
shaped. Oral surface of prementum mostly papillose, with a few 
spinules laterally and basally; spinnerets barely exceeding labial 
palpi (Fig. 6). 
The larva of Rubrica differs from that of nearly all other Bem- 
bicini in lacking all evidence of parietal bands and in having the 
spinules on the prementum confined to the sides and base. The short 
