LARVAE OF APHODIINAE — JERATH 81 



phorus caesus (Creutzer), Pleurophorus longulus Cartwright, and 

 Psammodius hydropicus Horn were obtained from the U.S. National 

 Museum. Larvae of Psammodius oregonensis Cartwright were col- 

 lected in the sand dunes at Waldport, Oreg. 



Larvae of this tribe may be characterized as follows : Frons on each 

 side with a single short posterior frontal seta and a microsensilla, a 

 short anterior frontal seta and a microsensilla, a long exterior frontal 

 seta and a microsensilla, and a long seta at each anterior angle. 

 Scissorial area of left mandible with S1+2, S3, and S4, of right mandible 

 with Si+2 and S34.4. Galea dorsally with three stout setae. Palpifer 

 differentiated; stipes without stridulatory teeth. 



Abdominal segments 1-5 each with three dorsal annulets; each 

 annulet with a transverse row of setae. Segments 6-8 each with three 

 transverse rows of setae but dorsa not divided. Segments 9 and 10 

 each with two transverse rows of setae, dorsa not divided. Lower 

 anal lobe subdivided into two distinct sublobes. 



Key to larvae of two genera of the tribe Psammodiini 



Galea ventrally with a long seta and a row of three short setae; each abdominal 

 spiracle-bearing area with 6-8 setae ventrally and two setae dorsally. 



Psammodius Fallen 

 Galea ventrally with a long seta and two short setae; each abdominal spiracle- 

 bearing area with two setae ventrally and one seta dorsally. 



Pleurophorus Mulsant 

 Genus Psammodius Fallen 



Larvae of this genus may be characterized as follows: Clypeus 

 divided into smaller preclypeus and large postclypeus. First and 

 third antennal segments subequal, second shorter than first and third. 

 Epipharynx with dexiophoba and laeophoba monostichous; mesophoba 

 incomplete in the middle and polystichous on the sides. Dexiotorma 

 produced cephalad and caudad into an armlike structure; laeotorma 

 small and slightly produced caudad with end blunt. 



Galea ventrally with a long seta and a row of three short setae. 

 Lacinia dorsally with a row of five long setae near the mesal edge and 

 a short seta posteriorly. Each abdominal spiracle-bearing area with 

 6-8 setae ventrally and two setae dorsally. Lower anal lobe divided 

 into two sublobes remote from each other. 



Key to the known larvae of Psammodius 



Frons without depressions; each antennal base with two long setae and two short 

 setae exterolaterally; tibiotarsus nearly three times as long as wide. 



oregonensis Cartwright 

 Frons with two depressions on each side; each antennal base with two long setae 

 and one short seta exterolaterally; tibiotarsus nearly twice as long as wide. 



hydropicus Horn 



