352 BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



3. Female 780/* long by 640/* wide, its pharynx 73/* long ; spicules 990/* and 100/i 



long, respectively Microtetrameres minima, p. 358. 



Female 1.2 to 2.5 mm. long by 1 mm. or more in width ; pharynx 160/* or 

 longer ; spicule lengths different from above 4. 



4. Female 1.2 to 1.3 mm., male 4.9 mm. long; long spicule 3.6 mm. in length. 



Microtetrameres helix, p. 355. 



Female 2 mm. or more, male not over 4.75 mm. long; long spicule not over 



2.3 mm. in length 5. 



5. Anus of female 225/* from posterior end; size of male 4.75 mm. by 130/*; 



spicules 2.3 mm. and 145/* long, respectively. 



Microtetrameres spiralis, p. 360. 



Anus of female not over 140/* from posterior end ; size of male not over 4 



mm. by 120/*; long spicule not over 1.32 mm., short spicule not over 



100/* long 6. 



6. Anus of female 74 to 100/* from posterior end ; long spicule 651 to 787/* long. 



Microtetrameres cruzi, p. 352. 

 Anus of female over lOO/i from posterior end ; long spicule over 1 mm 7. 



7. Male 3.5 to 4 mm. long Microtetrameres pusilla, p. 359 



Male 2.13 mm. long Microtetrameres inermis, p. 355. 



MICROTETRAMERES CRUZI (Travassos,, 1914) Travassos, 1915b 



Synonym. — T etrameres cruzi Travassos, 1914o\ 



Hosts. — Primary: Bucco swainsoni and Melanerpes -jlavifrons; 

 secondary: Unknown; probably similar in a general way to that of 

 T. -fissispina (p. 343). 



Location. — Proventriculus. 



Morphology. — Microtetrameres (p. 351). 



Male 1.17 to 1.4 mm. long by 85/* wide. Body threadlike, white, 

 strongly striated transversely but having no spines (fig. 4156). 

 Buccal capsule 12/t long by 4 to 5/x wide; pharynx 93/*, long by 9/*. 

 wide ; esophagus 290/*. long by 24/* wide. Anus 132/x from posterior 

 end. Spicules of very unequal dimension, the small one 82/*, the 

 larger 651 to 787/* long. Four pairs of papillae at the posterior end 

 of body, one pair preanal and 3 pairs postanal. 



Female 2 mm. long by 1.5 mm. wide. Body red-colored, strongly 

 striated transversely, and with 4 longitudinal furrows corresponding 

 to the lateral and median lines; these furrows, along with the axis 

 of the body, are spirally coiled (fig. 415a). Extremities of body 

 conical projections. Buccal capsule 16 to 20/* long by 8/* wide; 

 pharynx 160/* long; esophagus 620/* long. Intestine saclike, filled 

 with black detritus, narrows toward posterior end and terminates 

 in a fine canal. Anus 74 to 100/* from posterior end. Eggs 50 to 

 60/* long by 24 to 28/* wide, many of them containing well-developed 

 embryos. Vulva 300/* from posterior end. 



Life history. — Probably similar in a general way to that of T. 

 fissispina (p. 343). 



Distribution. — South America (Brazil). 



