1 12 
Psyche 
[June 
Figs. 1-8. Acanthognathus rudis. 1 . head in anterior view, x74; 2. left 
mandible in anterior view, xl55; 3. submature larva in side view, x22 ; 
4. very young larva in side view, x22 ; 5. left maxilla in anterior view, 
x206; 6-8. three types of body hairs on submature larva, x260. 
O.18 mm long, on abdominal somites VI-IX, with a recurved small 
anchor-tip; (4) 0.04-0.07 mm long, bifid, with a slightly curved shaft, 
a few on the dorsum of each abdominal somite. Integument of ab- 
dominal somites IX and X and of the ventral surface of the thorax 
and first three abdominal somites with minute spinules in short 
transverse rows. Cranium transversely subelliptical in anterior view. 
Material studied: 18 larvae from Brazil, collected by K. Lenko, 
courtesy of Dr. W. W. Kempf. 
Brown placed Acanthognathus in the Dacetiti along with Daceton , 
because the adults have ten funicular segments; but the larva of 
Daceton stands apart from all other known dacetine larvae with re- 
spect to body shape, abundance of body hairs and lack of medial 
mandibular teeth, whereas the larva of Acanthognathus shares most 
of the tribal characters (Wheeler and Wheeler 1954 p. 122). The 
only significant character shared with Daceton is head hairs moderate- 
ly numerous instead of sparse. 
The larva of Acanthognathus is perhaps most closely related to 
