128 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 50. 



of the ovijectors 450 to 560 /x. Eggs 60 to 70 fi long by 30 to 

 wide, in 8 to 32 celled stage when deposited. 



Host. — SylvUagus foridanus mallurus {Lepus sylvaticus) . 

 Location. — Small intestine. 

 Locality. — Bowie, Maryland. 



In comment on his species Eansom (1911&) says 

 that it is closest to T. retort aeformis. He also notes 

 that it is perhaps questionable whether the species 

 should be included in Trlchostrongylus in view of 

 the rather aberrant characters of the dorsal ray of 

 the bursa and of the spicules. The asymmetrical 

 origin of the dorsal ray and the 

 termination of its branches in 

 undivided tips are atypical, as 

 is the shape of the distal por- 

 tion of the spicules. 



TRICHOSTRONGYLUS PIGMENTATUS 

 (von Linstow, 1904) Hall, igi6. 



Synonym,. — Strongylus pig- 

 mentatus von Linstow, 1904. 



Specific diagnosis. — Tricho- 

 strongylus (p. 124) : Mouth with 

 three lips, each lip bearing on 

 its summit a small papilla. 

 Esophagus, testis, uterus, ova- 

 ries, and eggs colored black. 



Male 7.7 mm. long and 120 /x 

 thick. Length of esophagus 

 one- fourteenth of the total body 

 length. Bursa has two large 

 lateral lobes and a very narrow 

 median lobe (fig. 157). The 



36 



lOOyu. 



Fig. 156.— TRICHO- 

 STRONGYLUS CAL- 



CARATUs. Female 

 in region of vulva. 

 After Ransom, 

 1911. 



loop. 



Fig. 155.— Triciiostuongy 



LUS CALCARATUS. POSTE- , , i i i ill 



EioR EXTREMITY OF FE- latcFal lobcs are supported by 

 MALE. After Ransom, gix slender divergent rays. The 

 dorsal lobe is supported by a 

 dorsal ray which bifurcates near its distal extremity, each branch 

 in turn forming two terminal branches of which the external are 

 the shorter. Spicules short, 680 /x long, pale brown in color, and 

 with the usual discoid or scutelliform expansion of the proximal 

 extremity (fig. 158). Posteriorly the spicules terminate in three 

 branches, of which the thicker and longer one is rounded, while the 

 thinner and shorter ones are pointed. Gubernaculum? 



Female 10.5 mm. long and 140 fi thick. The tail is acuminate and 

 is one-sixty-sixth of the total length of the body. The anus is there- 



