1969] 
Wheeler and Wheeler — A canthognathus 
1 1 1 
Posterior end broadly rounded. Anus ventral and with a small 
posterior lip. Spiracles small; the mesothoracic the largest. Integu- 
ment of ventral surface of thorax and first three abdominal somites 
with minute spinules in transverse rows. Body hairs short to long, 
moderately numerous. Of three types : ( i ) about 0.09 mm long, 
bifid with the branches long, alveolus and articular membrane lack- 
ing, on the dorsa of all somites; (2) 0.09-0.22 mm long, nearly 
straight, distal half finely denticulate, on the ventral surface of each 
somite and a few of the longest in a transverse row around the mid- 
dle of each thoracic somite and abdominal somites IX and X; (3) 
0.19-0.26 mm long, with flexuous shaft and a small anchor-tip, four 
in a transverse row across the dorsal surface of each abdominal 
somite I -VI II, the shaft becoming shorter and straighter posteriorly. 
Cranium subhexagonal in anterior view and with the occipital border 
straight. Antennae small, with three sensilla each bearing a minute 
spinule. Head hairs moderately numerous, 0.08-0.1 1 mm long, with 
numerous minute denticles. Labrum twice as broad as long, bilobed 
due to a median impression of the ventral border; anterior surface 
of each lobe with seven sensilla on and near the ventral border ; 
ventral border with short rows of minute spinules; middle of pos- 
terior surface densely spinulose, the spinules minute and in long 
subparallel subtransverse rows, four sensilla near each ventrolateral 
corner. Mandibles large, heavily sclerotized ; narrowly subtriangular 
in anterior view; lateral portion thick and ending in a long sharp- 
pointed apical tooth, which is curved medially; medial portion of 
apical half thin and blade-like, with two sharp pointed subapical 
teeth. Maxillae short and lobose; no spinules seen; palp a slender 
peg on a broad base, with two apical, two lateral and one basal sen- 
silla, the lateral encapsulated, the others bearing a spinule each ; galea 
a slender subcone with two apical sensilla, each of which bears a 
spinule. Labium with numerous minute spinules in short arcuate 
rows; palps short and peg-like with two apical two lateral and one 
basal sensilla ; with an isolated sensillum between each palp and the 
opening of the sericteries; the latter a transverse slit in a depression. 
Hypopharynx spinulose, the spinules minute and in short arcuate 
rows. 
Very Young Larva. Length (through spiracles) about 0.67 mm. 
Generally similar to the submature larva, except in the following 
details: — Body hairs mostly long, sparse. Of four types: (1) 0.04- 
0.13 mm long, slightly curved to flexuous, with many minute den- 
ticles, the longest with alveolus and articular membrane; (2) about 
O.23 mm long, with flexuous shaft and small anchor-tip, four in a 
row across the dorsum of each abdominal somite II-V; (3) 0.07- 
