ART. 9 DIGGER WASPS OF GENUS PODALONIA FEENALD 13 



upward and slightly forward, is so nearly universal in Podalonia that 

 it can nearly always be used safely in determining the genus, in con- 

 nection with the other characters. 



These statements indicate why it is difficult to decide whether Sphex 

 andPodalonia should be regarded as distinct genera, only or subgenera. 



ANALYTICAL KEY TO SPECIES 



1 . Females (see p. 7) . 2 



Males 8 



2. Anterior margin of clypeus with teeth 3 



Anterior margin of clypeus without teeth 6 



3. Anterior margin of clypeus with four teeth. Large species 4 



Anterior margin of clypeus with two teeth 5 



■1. Inner face of fore coxa with a tooth near its end: wings usually semi- 

 hyaline valida (Cresson) (p. 13) 



Inner face of fore coxa without a tooth; wings strongly fuliginous. 



quadridentata (Cameron) (p. 17) 



5. Clj'peus silvery white pubescent nicholi (Carter) (p. 17) 



Clypeus without pubescence sonorensis (Cameron) (p. 20) 



6. Body entirely black (sometimes slightly piceous) luctuosa (Smith) (p. 21) 



Head and thorax black; abdomen deep blue argentifrons (Cresson) (p. 26) 



Head and thorax black; abdomen more or less ferruginous 7 



7. Petiole noticeably longer than hind coxa but shorter than hind coxa and 



trochanter together violaceipennis (Lepeletier) (p. 30) 



Petiole little if any longer than liind coxa; often seemingly shorter 

 violaceipennis, var. compacta, new variety (p. 33) 



8. Abdomen partly ferruginous 9 



Abdomen black, sometimes tinged with piceous 12 



9. Legs black 10 



Legs partly ferruginous nicholi (Carter) (p. 17) 



10. Inner face of fore coxa with a tooth near its end valida (Cresson) (p. 13) 



inner face of fore coxa without a tooth near its end 11 



11. Body rather stout for its length. 



violaceipennis, var. compacta, new variety (p. 33) 

 Body slender violaceipennis (Lepeletier) (p. 30) 



12. Second and third dorsal abdominal plates covered with minute, silvery, 



decumbent hairs (sericeous) looking like a white, transverse streak. 



argentifrons (Cresson) (p. 26) 

 Without silvery, decumbent hairs on abdomen luctuosa (Smith) (p. 21) 



DESCRIPTIONS OF SPECIES 



PODALONIA VALIDA (Cresson) 



Ammophila valida Cresson, Proc. Ent. Soc. Phila., vol. 4, p. 461, 1865. Female. 

 Ammophila grossa Cresson, Trans. Am. Ent. Soc, vol. 4, p. 209, 1872. Female. 

 Ammophila monlana Cameron, Biol. Centr.-Amer., Hym., vol. 2, p. 20, 1888. 



Male. 

 ? Ammophila jason Cameron, Biol. Centr.-Amer., Hym., vol. 2, p. 20, 1888. 



Female. 

 Psammophila grossa (Cresson) Melander and Brues, Biol. Bull., vol. 3, p. 41, 



1902. Male. 

 Ammophila {Psammophila) valida (Cresson) Melander, Psyche, vol. 10, pp. 158, 



162, 1903. 



