206 
Psyche 
[September 
differentiated somites; head on anterior end; a small posteriorly 
projecting boss on AX. Anus ventral. Spiracles small. Entire 
integument densely spinulose, spinules minute and in short to long 
straight or arcuate rows. Body hairs short, uniformly distributed 
and moderately numerous. Of two types: (i) 0.025-0.063 mm long, 
mostly bifid, sometimes with one or both branches rebranched, on all 
somites; (2) 0.037-0.05 mm long, simple, a few on each somite. 
Cranium subhexagonal in anterior view, slightly longer than wide. 
Antennae large, each a low mound with 3 minute sensilla, each 
bearing a minute spinule. Head hairs few, 0.025-0.05 mm long, 
simple or bifid. Labrum subarcuate, about twice as wide as long; 
anterior surface with 8 sensilla on and near ventral border; posterior 
surface with about 6 sensilla ventromedially and with a few oblique 
arcuate rows of minute spinules. Mandibles narrowly subtriangular 
in anterior view; apex rather long, narrow and heavily sclerotized; 
medial border with 6-8 small denticles. Maxillae with apex para- 
boloidal and sparsely spinulose, spinules minute to short and in a 
few arcuate rows; palp a peg with 4 (2 encapsulated and 2 bearing 
a spinule each) apical and one lateral sensilla; galea digitiform with 
2 apical sensilla, each bearing a minute spinule. Labium subtrape- 
zoidal, widest distally, anterior surface densely spinulose, spinules 
minute and in numerous short arcuate rows; palp a rounded elevation 
with 5 (2 encapsulated and 3 bearing a spinule each) sensilla; an 
isolated sensillum between each palp and opening of sericteries; the 
latter a slit in a shallow depression on anterior surface. Hypopharynx 
with minute spinules in long transverse sub-parallel rows. (Material 
studied: 10 larvae from Queensland, courtesy of Rev. B. B. Lowery.) 
Subfamily Pseudomyrmecinae 
We have never been able to key the genera of this subfamily. 
Except for head shape, where the difference in the species of Pachy- 
sima is greater than that between any two genera, some of the vari- 
ants of any character in any genus can be found in other genera. 
Bernard (1951: 1053) included larval characters in his character- 
ization of the subfamily, which he called family Promyrmicidae. 
Sudd (1967: 123) discussed the feeding of the larvae. He stated 
(erroneously) that the trophothylax was formed by the bases of the 
rudimentary legs; we have shown (1956: 375, 383) that it is 
“formed from the depressed ventral surface of the thorax and elab- 
oration of the first and second abdominal somites.” 
