78 BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



KEY TO SPECIES OP ASCARIDIA 



1. Inadequately described; female 85 mm., male 53 mm. long; from Gallus 



gallus, Australia Ascaridia compressa, p. 8S. 



Description more adequate than above 2. 



2. Male with 13 pairs of caudal papillae, in 2 unusually closely-set rows; 



spicules equal, 630/* long by 2Afi wide; from Macropygia nighrostris. 



Ascaridia australis, p. 84. 



Male usually with less than 13 pairs of papillae; if has 13 pairs, spicules 



different from above ; from other hosts than above 3. 



3. Spicules described as unequal 4. 



Spicules equal or subequal 5. 



4. Female 39 mm., male 40 mm. long ; 9 pairs of caudal papillae ; from Capri- 



mulgus campestris Ascaridia amblymoria, p. 83. 



Female 55 mm., male 43 mm. long ; caudal papillae number 10 pairs plus 

 an occasional unpaired papilla ; from Tetrao urogallus. 



Ascaridia cylindrica, p. 90. 



5. Male with a total of not more than 18 caudal papillae 6. 



Male with a total of 20 or more caudal papillae 16. 



6. No preanal caudal papillae but 8 pairs of postanals. 



Ascaridia dolichocerca, p. 90. 

 Preanal caudal papillae present < 7. 



7. Male 36 to 50 mm. long or longer ; female 62 to 100 mm. long 8. 



Male not over 31 mm. long; female not over 60 mm. long 10. 



S. Esophagus 1/14 of total body length; 4 pairs of preanal caudal papillae; 



tail of female 1/65 of total body length Ascaridia compar, p. 88. 



Esophagus 1/12.8 to 1/12.3 of total body length; 3 pairs of preanal caudal 

 papillae ; tail of female not described in one species, 1/133 of total body 



length in other species 9. 



9. Female 90 to 100 mm. long ; male 50 mm. or longer ; ventral surface of 

 male tail covered with conspicuous granulations. 



Ascaridia styphlocerca, p. 100. 

 Female 62 mm. long; male 40 mm. long; male tail without granulations. 



Ascaridia francolina, p. 92. 



10. Male with 6 or 7 pairs of postanal papillae 11. 



Male with not more than 5 pairs of postanal papillae 14. 



11. Spicules 570/i long; male tail with granulations in region of sucker. 



Ascaridia granulosa, p. 92. 



Spicules 1 mm. or longer ; male tail without granulations in region of 



sucker 12. 



12. Body not described as having lateral alae : spicules 3.63 mm. long; tail 



of male 1/77 of total length ; eggs 96/u. long by 57/a wide. 



Ascaridia magnipapilla. p. 95. 



Body with lateral alae; spicules not over 2.1 mm. long; tail of male 1 52 



to 1/46 of total body length; egg sizes not given 13. 



13. Only male known, 30 mm. long: papillae scattered over the whole body; 



spicules subequal, 2.1 and 1.9 mm. long Ascaridia longecirrata, p. 94. 



Both male and female known. Male 21 mm. long ; no papillae described 

 on body as above; spicules equal, 1.05 mm. long. 



Ascaridia catheturina, p. 85. 



14. Vulva posterior to middle of body, dividing body length in ratio of 15:11; 



spicules 790,u long Ascaridia aegyptiaca, p. 83. 



Vulva slightly anterior to middle of body ; spicules 1.7 mm. or longer 15. 



