136 
Psyche 
[December 
each abdominal somite i-v. Antennae small, with only two 
sensilla each. Head hairs short to moderately long, flexible 
and denticulate. Posterior surface of labrum with six sen- 
silla. Maxillary palp a low elevation bearing four sensilla. 
Labium with a pair of mammiform ventrolateral lobes, 
each bearing a palp which is a low elevation with four 
sensilla. 
Strumigenys louisianae Roger 
(PL 10, flgs. 1-6) 
Mature larva: Length about 2 mm. Short and stout; 
prothorax directed ventrally; head ventral; anterior end 
formed from the dorsum of the prothorax; dorsal profile 
C-shaped, ventral feebly sinuate; diameter of body increas- 
ing gradually from the anterior end to abdominal somite V, 
then decreasing to the posterior end, which is broadly 
rounded. Anus ventral. Leg vestiges present. Segmenta- 
tion indistinct. Spiracles small, diameter decreasing grad- 
ually from the mesothoracic toward the posterior end. 
Integument of ventral surface of thorax and first three 
abdominal somites with rather long transverse rows of 
minute spinules; a few shorter rows of minute spinules 
on the posterior surface of the last few abdominal somites. 
Body hairs moderately numerous, uniformly distributed 
(except on the naked midventral surface of the thorax 
and abdominal somites i-ili), short to moderately long. 
Of three types: (1) on the ventral surface of the thorax 
and of abdominal somites i-vi, few, denticulate, 0.027-0.126 
mm long, flexible; (2) on the dorsal and lateral surfaces, 
0.054-0.148 mm long, bifid, with the branches finely den- 
ticulate; (3) anchor-tipped, with tortuous shaft, about 
0.165 mm long, four in a row across the dorsal surface of 
each abdominal somite l-v. Cranium vaguely subhexagonal ; 
slightly broader than long; middle of occipital border feebly 
convex. Antennae minute, each with only two sensilla; 
each sensillum bears a spinule. Head hairs few, moderately 
long (0.054-0.125 mm), flexible and denticulate. Labrum 
small and short; breadth 2.5 times length; bilobed due to 
a median impression of the ventral border ; anterior surface 
of each lobe with three sensilla; ventral border of each 
