AKT. 5 A NEW PARASITIC NEMATODE SCHWARTZ 3 



Host. — "Brown bat," genus and species unknown. 



Locality. — College Station, Texas. 



Location . — Intestine . 



r?/^6.— U.S.N. M. No. 27138. Paratypes. U.S.N.M. No. 27199. 



The genus Anoplostrongylus has close affinities with the genus His- 

 tiostrongylus, from which it has been recently separated by Boulenger 

 (1926) . The latter proposed the genus Anoplostrongylus on the basis 

 of Histiostrongylus paradoxus Travassos, 1918, and assigned to it 

 Strongylus tipulaysniBeneden, 1873 {Histiostrongylus tipulaTT&y&ssos, 

 1918). It should be noted in this connection that Travassos (1921) 

 observed certain differences between Histiostrongylus coronatus of 

 Molin and his own species, H. paradoxus, the most important of 

 these being the absence of spines in the cephalic dilatation of H. para- 

 doxus, and the occurrence of three spikelike processes on the tail in 

 H . paradoxus, in contrast to the single spike in H . coronatus. He 

 also noted that the spicules in his species have barbed distal extrem- 

 ities whereas in Molin's species the tips of the spicules are trifurcated. 

 Despite these important differences between the two species, Tra- 

 vassos did not consider it desirable to establish a new genus for his 

 species, but he stated that a reexamination of Molin's species would 

 be necessary to establish the generic characters of the genus Histio- 

 strongylus. 



Recently Boulenger (1926) described a new trichostrongyle from 

 Tapliozous perforatus from Egypt, which is generic ally identical with 

 H . coronatus of Molin. On the basis of these two species Boulenger 

 has given a generic diagnosis of the genus Histiostrongylus which leaves 

 no room for doubt that H . paradoxus Travassos represents a new 

 genus. As has already been said Boulenger proposed the name Ano- 

 plostrongylus for the latter genus and assigned Strongylus tipula (H. 

 tipula) to that genus. 



On the basis of the three species of Anoplostrongylus, the genus 

 may be defined as follows: 



Trichostrongylidae with cuticle of head expanded forming a well- 

 marked cephalic dilatation. Mouth cavity small, leading into a 

 club-shaped esophagus. Female with vulva in the posterior third of 

 the body, with well-developed ovejectors and divergent uteri. Tail 

 short, ending in a slender tip and also provided with three spikelike 

 processes. Male with a well-developed bursa, the latter with large 

 lateral lobes and a small dorsal lobe. The ventro-ventral and latero- 

 ventral rays more or less divergent; medio-lateral and postero-lateral 

 rays with a common stem, close together, the externo-lateral ray 

 diverging from them. Externo-dorsal rays relatively long, dorsal ray 

 bifurcating distally. Spicules slender gradually attenuated. Gu- 

 bernaculum present. 



