1977] 
Moore — Larva of Rothrium sonorensis 
263 
1 mm 
Figure 1 . Larva of Rothium sonorensis Moore & Legner; dorsal aspect. 
hooked and with a small tooth at apex and three other small teeth 
internally just below apex; with a row of long setae beginning at 
basal half and diminishing in length to base. Labial palpus two- 
segmented, first segment slightly more than twice as long as wide, 
parallel sided; second segment narrower but almost as long as first, 
tapered to apex. Ligula longer and wider than first segment of 
labial palpus, narrowed to truncate apex. Pronotum a little wider 
than long; quadrate; with the apex arcuate, apical angles broadly 
rounded, sides straight and somewhat converging to narrowly 
rounded basal angles; base almost straight; surface with scattered 
long setae. Mesonotum and metanotum of about equal size and 
shape; about as wide as pronotum and only half as long; each side 
with a row of five setae below the anterior margin, two discal setae, 
a row of three setae along the base and three setae in the lateral 
series. Tergites one through seven similar, with the first about as 
wide but not as long as metanotum, each succeeding very slightly 
wider and somewhat longer than the preceding so that tergite seven 
is wider than the metanotum and about as long; each with a discal 
